ria N{alpha}-Acetylation of the virulence factor EsxA is required for mycobacterial cytosolic translocation and virulence [Molecular Bases of Disease] By feedproxy.google.com Published On :: 2020-04-24T06:08:45-07:00 The Mycobacterium tuberculosis virulence factor EsxA and its chaperone EsxB are secreted as a heterodimer (EsxA:B) and are crucial for mycobacterial escape from phagosomes and cytosolic translocation. Current findings support the idea that for EsxA to interact with host membranes, EsxA must dissociate from EsxB at low pH. However, the molecular mechanism by which the EsxA:B heterodimer separates is not clear. In the present study, using liposome-leakage and cytotoxicity assays, LC-MS/MS–based proteomics, and CCF-4 FRET analysis, we obtained evidence that the Nα-acetylation of the Thr-2 residue on EsxA, a post-translational modification that is present in mycobacteria but absent in Escherichia coli, is required for the EsxA:B separation. Substitutions at Thr-2 that precluded Nα-acetylation inhibited the heterodimer separation and hence prevented EsxA from interacting with the host membrane, resulting in attenuated mycobacterial cytosolic translocation and virulence. Molecular dynamics simulations revealed that at low pH, the Nα-acetylated Thr-2 makes direct and frequent “bind-and-release” contacts with EsxB, which generates a force that pulls EsxB away from EsxA. In summary, our findings provide evidence that the Nα-acetylation at Thr-2 of EsxA facilitates dissociation of the EsxA:B heterodimer required for EsxA membrane permeabilization and mycobacterial cytosolic translocation and virulence. Full Article
ria Modification of a PE/PPE substrate pair reroutes an Esx substrate pair from the mycobacterial ESX-1 type VII secretion system to the ESX-5 system [Molecular Bases of Disease] By feedproxy.google.com Published On :: 2020-05-01T00:06:09-07:00 Bacterial type VII secretion systems secrete a wide range of extracellular proteins that play important roles in bacterial viability and in interactions of pathogenic mycobacteria with their hosts. Mycobacterial type VII secretion systems consist of five subtypes, ESX-1–5, and have four substrate classes, namely, Esx, PE, PPE, and Esp proteins. At least some of these substrates are secreted as heterodimers. Each ESX system mediates the secretion of a specific set of Esx, PE, and PPE proteins, raising the question of how these substrates are recognized in a system-specific fashion. For the PE/PPE heterodimers, it has been shown that they interact with their cognate EspG chaperone and that this chaperone determines the designated secretion pathway. However, both structural and pulldown analyses have suggested that EspG cannot interact with the Esx proteins. Therefore, the determining factor for system specificity of the Esx proteins remains unknown. Here, we investigated the secretion specificity of the ESX-1 substrate pair EsxB_1/EsxA_1 in Mycobacterium marinum. Although this substrate pair was hardly secreted when homologously expressed, it was secreted when co-expressed together with the PE35/PPE68_1 pair, indicating that this pair could stimulate secretion of the EsxB_1/EsxA_1 pair. Surprisingly, co-expression of EsxB_1/EsxA_1 with a modified PE35/PPE68_1 version that carried the EspG5 chaperone-binding domain, previously shown to redirect this substrate pair to the ESX-5 system, also resulted in redirection and co-secretion of the Esx pair via ESX-5. Our results suggest a secretion model in which PE35/PPE68_1 determines the system-specific secretion of EsxB_1/EsxA_1. Full Article
ria A neuroglobin-based high-affinity ligand trap reverses carbon monoxide-induced mitochondrial poisoning [Molecular Biophysics] By feedproxy.google.com Published On :: 2020-05-08T03:41:14-07:00 Carbon monoxide (CO) remains the most common cause of human poisoning. The consequences of CO poisoning include cardiac dysfunction, brain injury, and death. CO causes toxicity by binding to hemoglobin and by inhibiting mitochondrial cytochrome c oxidase (CcO), thereby decreasing oxygen delivery and inhibiting oxidative phosphorylation. We have recently developed a CO antidote based on human neuroglobin (Ngb-H64Q-CCC). This molecule enhances clearance of CO from red blood cells in vitro and in vivo. Herein, we tested whether Ngb-H64Q-CCC can also scavenge CO from CcO and attenuate CO-induced inhibition of mitochondrial respiration. Heart tissue from mice exposed to 3% CO exhibited a 42 ± 19% reduction in tissue respiration rate and a 33 ± 38% reduction in CcO activity compared with unexposed mice. Intravenous infusion of Ngb-H64Q-CCC restored respiration rates to that of control mice correlating with higher electron transport chain CcO activity in Ngb-H64Q-CCC–treated compared with PBS-treated, CO-poisoned mice. Further, using a Clark-type oxygen electrode, we measured isolated rat liver mitochondrial respiration in the presence and absence of saturating solutions of CO (160 μm) and nitric oxide (100 μm). Both CO and NO inhibited respiration, and treatment with Ngb-H64Q-CCC (100 and 50 μm, respectively) significantly reversed this inhibition. These results suggest that Ngb-H64Q-CCC mitigates CO toxicity by scavenging CO from carboxyhemoglobin, improving systemic oxygen delivery and reversing the inhibitory effects of CO on mitochondria. We conclude that Ngb-H64Q-CCC or other CO scavengers demonstrate potential as antidotes that reverse the clinical and molecular effects of CO poisoning. Full Article
ria The Struggle for the State in Syria By feedproxy.google.com Published On :: Tue, 14 Jan 2020 10:50:01 +0000 Research Event 11 March 2020 - 9:00am to 6:30pm Chatham House | 10 St James's Square | London | SW1Y 4LE This conference brings together policymakers, experts, academics and civil society leaders to explore the current condition of the state in Syria. It examines the structure, interrelations and importance of the regime’s core institutions and their interactions with international actors. It also highlights the regime’s different approaches in dealing with state institutions and non-state actors.The speakers discuss governance dynamics in north-western Syria and the east Euphrates region and will analyse governance variations between regions within the regime-controlled areas after the dramatic changes in 2018 and 2019.The conference also aims to evaluate the possibility for Syrians to move from a regime-led state to one that is accountable to its citizens and is governed by the rule of law. Event attributes Livestream Department/project Middle East and North Africa Programme, Syria from Within Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email Full Article
Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email
ria Breaking the Cycle of Violence: Transitional Justice for the Victims of ISIS in Syria By feedproxy.google.com Published On :: Mon, 27 Apr 2020 15:50:01 +0000 28 April 2020 This paper aims to assist the region’s local authorities, and their key foreign backers, in understanding how transitional justice can provide alternative avenues for holding local ISIS members to account while contributing to the healing of communities. Read online Download PDF Haid Haid Senior Consulting Fellow, Middle East and North Africa Programme @HaidHaid22 2020-04-28-Syria-prison.jpg A fighter with the Syrian Democratic Forces monitors prisoners accused of being affiliated with ISIS, at a prison in the northeastern Syrian city of Hassakeh on 25 October 2019. Photo: Getty Images. SummaryFollowing the territorial defeat of Islamic State of Iraq and Syria (ISIS) in northeastern Syria, the Kurdish-led autonomous administration in the region is now grappling with the task of quickly dealing with thousands of the group’s detained members while bringing justice to their victims. To that end, local authorities are focusing on the use of counterterrorism laws and courts to charge captured ISIS members and determine their guilt accordingly.The piecemeal approach to justice is deeply flawed, and raises particular concerns about due process. No precise instruments exist to determine the personal responsibility of ISIS individuals for specific crimes, or for their role in war crimes committed by the group. In any event, the scale of the crimes and the number of victims – as well as severe shortages of resources and workers – make dispensation of justice extremely difficult through the traditional legal system.Not all detained ISIS members receive prison sentences. Individuals who did not hold senior roles in the group’s apparatus and are not accused of ‘major’ crimes (in practice, largely defined as fighting for ISIS and murder) are being released under limited reconciliation deals with tribal leaders. But the involvement of local community leaders in those efforts is not enough to ensure positive results. Many victims are upset at seeing ISIS members walk free without even admitting their guilt publicly or apologizing for the pain they caused.To overcome the limitations of the current, counterterrorism-focused framework, a ‘transitional justice’ approach could provide judicial and non-judicial instruments to establish accountability for ISIS crimes and reduce community resistance to the reintegration of group members. A combination of non-judicial mechanisms such as truth commissions, missing persons’ committees, and reparations and victim-healing programmes could play a vital role in providing ISIS victims with a sense of justice while contributing to peacebuilding and stability.Ignoring the urgency of developing a long-term plan to serve justice and contribute to community healing will almost certainly allow ISIS to continue to prevent the recovery and development of northeastern Syria. This, in turn, risks undermining the stability of the country and the region at large. Department/project Middle East and North Africa Programme Full Article
ria Webinar: Breaking the Cycle of Violence: Transitional Justice for the Victims of ISIS in Syria By feedproxy.google.com Published On :: Wed, 06 May 2020 09:05:01 +0000 Research Event 12 May 2020 - 2:00pm to 3:00pmAdd to CalendariCalendar Outlook Google Yahoo Haid Haid, Senior Consulting Fellow, Middle East and North Africa Programme, Chatham HouseSara Kayyali, Syria Researcher, Middle East and North Africa Division, Human Rights WatchModerator: Lina Khatib, Director, Middle East and North Africa Programme, Chatham House You can register your interest here. Alternatively, you can watch the webinar live on the MENA Programme Facebook page.Following the territorial defeat of Islamic State of Iraq and Syria (ISIS) in northeastern Syria, the Kurdish-led autonomous administration in the region is now grappling with the task of quickly dealing with thousands of the group’s detained members while bringing justice to their victims. To that end, local authorities are focusing on the use of counterterrorism laws and courts to charge captured ISIS members and determine their guilt accordingly.In a recent research paper, author Haid Haid argues that this approach to justice is deeply flawed as it raises concerns about due process and lacks the precise instruments to determine the personal responsibility of ISIS individuals for specific crimes, or for their role in war crimes committed by the group. The paper proposes that a ‘transitional justice’ approach could provide judicial and non-judicial instruments to establish accountability for ISIS crimes and reduce community resistance to the reintegration of group members.In this webinar, part of the MENA Programme’s Online Event Series, speakers will examine the benefits of such an approach to justice for overcoming the limitations of the current, counterterrorism-focused framework. Panelists will discuss the alternative mechanisms local authorities and their key foreign backers can use to hold local ISIS members to account while contributing to the healing of communities. The event will be held on the record. Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email Department/project Middle East and North Africa Programme, Syria from Within Full Article
Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email
ria NAD+ biosynthesis in bacteria is controlled by global carbon/nitrogen levels via PII signaling [Microbiology] By feedproxy.google.com Published On :: 2020-05-01T00:06:09-07:00 NAD+ is a central metabolite participating in core metabolic redox reactions. The prokaryotic NAD synthetase enzyme NadE catalyzes the last step of NAD+ biosynthesis, converting nicotinic acid adenine dinucleotide (NaAD) to NAD+. Some members of the NadE family use l-glutamine as a nitrogen donor and are named NadEGln. Previous gene neighborhood analysis has indicated that the bacterial nadE gene is frequently clustered with the gene encoding the regulatory signal transduction protein PII, suggesting a functional relationship between these proteins in response to the nutritional status and the carbon/nitrogen ratio of the bacterial cell. Here, using affinity chromatography, bioinformatics analyses, NAD synthetase activity, and biolayer interferometry assays, we show that PII and NadEGln physically interact in vitro, that this complex relieves NadEGln negative feedback inhibition by NAD+. This mechanism is conserved in distantly related bacteria. Of note, the PII protein allosteric effector and cellular nitrogen level indicator 2-oxoglutarate (2-OG) inhibited the formation of the PII-NadEGln complex within a physiological range. These results indicate an interplay between the levels of ATP, ADP, 2-OG, PII-sensed glutamine, and NAD+, representing a metabolic hub that may balance the levels of core nitrogen and carbon metabolites. Our findings support the notion that PII proteins act as a dissociable regulatory subunit of NadEGln, thereby enabling the control of NAD+ biosynthesis according to the nutritional status of the bacterial cell. Full Article
ria Modification of a PE/PPE substrate pair reroutes an Esx substrate pair from the mycobacterial ESX-1 type VII secretion system to the ESX-5 system [Molecular Bases of Disease] By feedproxy.google.com Published On :: 2020-05-01T00:06:09-07:00 Bacterial type VII secretion systems secrete a wide range of extracellular proteins that play important roles in bacterial viability and in interactions of pathogenic mycobacteria with their hosts. Mycobacterial type VII secretion systems consist of five subtypes, ESX-1–5, and have four substrate classes, namely, Esx, PE, PPE, and Esp proteins. At least some of these substrates are secreted as heterodimers. Each ESX system mediates the secretion of a specific set of Esx, PE, and PPE proteins, raising the question of how these substrates are recognized in a system-specific fashion. For the PE/PPE heterodimers, it has been shown that they interact with their cognate EspG chaperone and that this chaperone determines the designated secretion pathway. However, both structural and pulldown analyses have suggested that EspG cannot interact with the Esx proteins. Therefore, the determining factor for system specificity of the Esx proteins remains unknown. Here, we investigated the secretion specificity of the ESX-1 substrate pair EsxB_1/EsxA_1 in Mycobacterium marinum. Although this substrate pair was hardly secreted when homologously expressed, it was secreted when co-expressed together with the PE35/PPE68_1 pair, indicating that this pair could stimulate secretion of the EsxB_1/EsxA_1 pair. Surprisingly, co-expression of EsxB_1/EsxA_1 with a modified PE35/PPE68_1 version that carried the EspG5 chaperone-binding domain, previously shown to redirect this substrate pair to the ESX-5 system, also resulted in redirection and co-secretion of the Esx pair via ESX-5. Our results suggest a secretion model in which PE35/PPE68_1 determines the system-specific secretion of EsxB_1/EsxA_1. Full Article
ria Syria's Economy: Picking up the Pieces By feedproxy.google.com Published On :: Fri, 10 Jul 2015 09:33:00 +0000 23 June 2015 20150623SyriaEconomy.jpg Photo: Getty Images/Stringer. On Tuesday 23 June, Chatham House will publish Syria's Economy: Picking up the Pieces, a comprehensive account of the state of the Syrian economy and its prospects. The paper, by David Butter, associate fellow on the Middle East and North Africa Programme, finds that:Syria's economy has contracted by more than 50 per cent in real terms since 2011, with the biggest losses in output coming in the energy and manufacturing sectors. Agriculture has assumed a bigger role in national output in relative terms, but food production has fallen sharply as a result of the conflict.Inflation has averaged 51 per cent between January 2012 and March 2015, according to the monthly data issued by the government, and the Syrian pound has depreciated by about 80 per cent since the start of the conflict.In the first half of 2015, the regime has shown increasing signs of strain on both the military and the economic fronts. The regime has lost ground to rebel forces, and the Syrian pound has depreciated at the fastest rate since the conflict began.Continued support from Iran, in the form of oil supplies and import credits, will come with political and economic conditions.The question arises as to whether a dramatic worsening in the economic situation might be the catalyst for the regime’s military collapse or for an externally imposed political settlement against Assad’s wishes; or whether further military setbacks might be the trigger for the government’s economic collapse. Editor's notes Read Syria's Economy: Picking up the PiecesThis paper is the first research output of the Middle East and North Africa Programme’s flagship project, Syria and its Neighbours, a multiyear research initiative examining the long-term impact of the conflict on neighbouring countries. Contacts Press Office +44 (0)20 7957 5739 Email Full Article
ria First ever global analysis of refugees’ energy use: High costs and poor supply undermine humanitarian assistance By feedproxy.google.com Published On :: Tue, 17 Nov 2015 11:50:49 +0000 11 November 2015 20151119MovingEnergyInitiative.jpg A migrant girl looks at a light illuminating a camp site of refugees and migrants on the Greek island of Lesbos, 4 October 2015. Photo: Getty Images. About 90 per cent of refugees living in camps have no access to electricity and many lack any form of lighting at night, says a Chatham House report for the Moving Energy Initiative. Energy poverty in refugee settlements is not on the radar of international initiatives and humanitarian agencies are ill-equipped to deal with the scale of need. Heat Light and Power for Refugees: Saving Lives, Reducing Costs zooms in on the energy needs of refugees and displaced people worldwide, and presents the first ever estimates of the volume and costs of what they use.'The problem goes beyond electricity. 80 per cent of those in camps rely on firewood for cooking and, as a result, we estimate that some 20,000 people die prematurely each year due to the pollution from indoor fires. Exposure to extremes of cold and heat are also killers for people living in flimsy, temporary shelter,' says Glada Lahn, senior research fellow at Chatham House. 'The current lack of provision for energy undermines the fundamental aims of humanitarian assistance,' she adds.There are nearly 60 million forcibly displaced people in the world, and they pay staggering costs for energy. The 83,277 households living in Dadaab in Kenya, the world’s largest refugee settlement, spent an estimated $6.2 million on firewood last year, which accounts for approximately 24 per cent of their overall household income. (The average UK household spent 4 per cent of its income on energy in 2011.) In Uganda, almost half of refugee households surveyed by the UNHCR skip meals because they do not have enough fuel to cook with.'The imperative is to find humane, creative and cost-effective ways to respond to the needs of so many individuals, most of whom are women and children. Improving access to clean, safe and sustainable energy offers a promising way forward,' says Kofi Annan in the report’s foreword.The report calls for an overhaul in the way that heat, light and power are delivered in humanitarian crises. It makes the case for new partnerships between humanitarian agencies and private providers to increase clean energy access in refugee settlements. Investment in energy infrastructure will also benefit host communities in some of the world’s poorest countries.'As refugee households spend approximately $2.1 billion on energy each year, developing local markets for energy services could be part of a mix of solutions,' adds Lahn. 'Using green, culturally appropriate technologies could save lives, reduce CO2 emissions by 11 million tonnes per year and radically improve living standards. Introducing even the most basic solutions, such as improved cookstoves and basic solar lanterns, could save $323 million a year in fuel costs.' Other findings include:Rape and violence against women is common in many unlit camps. Only 4 per cent of women and girls in households in the Goudoubo camp in Burkina Faso would go out after dark due to the lack of streetlights.Wood equalling around 49,000 football pitches worth of forest (64,700 acres) is burned by displaced families living in camps each year, mainly in countries suffering severe deforestation, because they have no alternative sources of energy.Firewood consumption emits nearly twice as much CO2 as liquid petroleum gas and produces little energy in comparison to its carbon intensity.International Development Minister Grant Shapps said:‘Across sub-Saharan Africa, hundreds of millions of people still do not have access to electricity. Women and girls are at risk of violence after dark, families are forced to inhale toxic kerosene fumes, and energy remains unaffordable for many.‘With the technology in place and investors coming on board, the time to act is now. The UK's Energy Africa campaign is already kick-starting a solar revolution across the continent.‘Supporting the Moving Energy Initiative is another way Britain can help boost access to clean, reliable and affordable energy. This will transform people’s lives and help achieve the UN’s goal of universal energy access by 2030.’ Editor's notes Read Heat Light and Power for Refugees: Saving Lives, Reducing Costs by Glada Lahn and Owen Grafham.To link back to the report in an article, please use this landing page for the final report.The Moving Energy Initiative (MEI) is a collaboration between GVEP International, Chatham House, Practical Action Consulting, the Norwegian Refugee Council (NRC) and the United Nations High Commissioner for Refugees (UNHCR). The report is supported by the UK Department for International Development through the Humanitarian Innovation and Evidence Programme.The number of refugee households in Dadaab, Kenya is as of May 2015.Chatham House will host a press briefing with MEI programme board member Michael Keating and authors Glada Lahn and Owen Grafham on Thursday 12 November at 10:30-11:30 GMT. To register, or for interview requests, please contact the press office.All figures are original and based on estimations and calculations prepared for the Moving Energy Initiative. Chatham House designed a model offering the first estimates of the scale and cost of energy use and CO2 emissions among forcibly displaced households worldwide, not including people affected by natural disasters. For more details on the populations considered in the report and used in the model, contact the authors.The authors are available to answer questions from the media. Please contact the press office. Contacts Press Office +44 (0)20 7957 5739 Email Full Article
ria By enabling formal trade, Nigeria can unleash its vast potential By feedproxy.google.com Published On :: Mon, 07 Dec 2015 16:18:19 +0000 3 December 2015 20151207Nigeriabooming.jpg Nigeria’s booming informal trade is costly for society, business and government, yet a critical opportunity exists to formalize such trade and drive more sustainable and less volatile growth, argues a new report from Chatham House.According to one estimate, informal activity accounts for up to 64 per cent of Nigeria’s GDP. Nigeria's Booming Borders: The Drivers and Consequences of Unrecorded Trade finds that this is a result of obstacles that impede trading through formal channels. These drivers include bureaucratic burdens and other factors, such as:The need for Nigerian businesses to produce at least nine documents in order to send an export shipment and at least 13 in order to bring in an import consignment.Rigid and dysfunctional foreign-exchange regulations that push most smaller traders into the incompletely regulated parallel exchange market.Corruption and unofficial ‘taxation’, especially on major border highways, which delegitimize formal channels and encourage the use of smuggling routes.As a result, the state loses direct tax revenues that would be generated by formal cross-border trade. This is not just siphoned into the informal economy; some is lost entirely. For example, many shippers opt to dock in neighbouring countries rather than deal with the expense and difficulty of using Nigeria’s ports.Informal trade also undermines the social contract between the private sector and government. The state lacks tax revenues to pay its officials, improve infrastructure or implement reforms, while traders feel the government provides no services in return for any taxes they might pay.‘Every day tens of thousands of unofficial payments are made, none destined for the government. Policy-makers need to create an environment that encourages trade to flow through formal channels and capture lost revenue’, says co-author Leena Koni Hoffmann.‘Formalization would assist Nigeria to pursue more high-quality, high-tech economic activity at a time when rising labour costs in Asia are creating scope for Nigerian manufacturers to compete’, she adds.The report makes a number of recommendations for how Nigeria could encourage more formal trade, including:Strengthening the resources and capacity of the Federal Ministry of Industry, Trade and Investment to coordinate action across key government ministries, departments and agencies, as well as public and private stakeholders.Prioritizing engagement in the development of Economic Community of West African States (ECOWAS) trade policies and fully implementing the ECOWAS Protocol on Free Movement of Persons to reduce harassment at borders.Allowing banks to operate simple services for small and medium-sized businesses to make trade payments directly from Nigerian naira to CFA francs and vice versa.Improving basic facilities that support traders, including improving the efficiency of border posts, installing truck parks and all-weather surfacing on market access roads, and introducing online booking for trucks to enter ports.Separating responsibilities for assessing duty and tariff liabilities from revenue collection in order to reduce opportunities for corruption, an approach already tested with success by the Lagos State Internal Revenue Service.Increasing funding and technical support for the National Bureau of Statistics, which has a significant role to play in measuring and capturing more of Nigeria’s external trade.Interviews conducted for the report reveal that business people would welcome the opportunity to pay taxes, but only if they received assurance that these payments would represent a contract with government guaranteeing that conditions for business would be improved.‘As Africa’s largest economy, formalizing external trade would allow Nigeria to fulfil its potential as the trading engine of the West and Central African economy and shape the business landscape across the region,’ says co-author Paul Melly. Editor's notes Read Nigeria's Booming Borders: the Drivers and Consequences of Unrecorded Trade (embargoed until 17:00 GMT on Monday 7 December).To request an interview with the authors, contact the press office.Nigeria’s recorded external trade for 2014 was $135.8 billion.Estimate of informal activity as a percentage of GDP from Jonathan Emenike Ogbuabor and Victor A. Malaolu, ‘Size and Causes of the Informal Sector of the Nigerian Economy: Evidence from Error Correction Mimic Model’, Journal of Economics and Sustainable Development, Vol. 4, No. 1, 2013. Contacts Press Office +44 (0)20 7957 5739 Email Full Article
ria Weak functoriality of Cohen-Macaulay algebras By www.ams.org Published On :: Tue, 10 Mar 2020 10:59 EDT Yves André J. Amer. Math. Soc. 33 (2020), 363-380. Abstract, references and article information Full Article
ria A PP2A Phosphatase High Density Interaction Network Identifies a Novel Striatin-interacting Phosphatase and Kinase Complex Linked to the Cerebral Cavernous Malformation 3 (CCM3) Protein By feedproxy.google.com Published On :: 2009-01-01 Marilyn GoudreaultJan 1, 2009; 8:157-171Research Full Article
ria Analysis of the Subunit Composition of Complex I from Bovine Heart Mitochondria By feedproxy.google.com Published On :: 2003-02-01 Joe CarrollFeb 1, 2003; 2:117-126Research Full Article
ria Phosphoproteome Analysis of E. coli Reveals Evolutionary Conservation of Bacterial Ser/Thr/Tyr Phosphorylation By feedproxy.google.com Published On :: 2008-02-01 Boris MacekFeb 1, 2008; 7:299-307Research Full Article
ria Noncatalytic Bruton's tyrosine kinase activates PLC{gamma}2 variants mediating ibrutinib resistance in human chronic lymphocytic leukemia cells [Membrane Biology] By feedproxy.google.com Published On :: 2020-04-24T06:08:45-07:00 Treatment of patients with chronic lymphocytic leukemia (CLL) with inhibitors of Bruton's tyrosine kinase (BTK), such as ibrutinib, is limited by primary or secondary resistance to this drug. Examinations of CLL patients with late relapses while on ibrutinib, which inhibits BTK's catalytic activity, revealed several mutations in BTK, most frequently resulting in the C481S substitution, and disclosed many mutations in PLCG2, encoding phospholipase C-γ2 (PLCγ2). The PLCγ2 variants typically do not exhibit constitutive activity in cell-free systems, leading to the suggestion that in intact cells they are hypersensitive to Rac family small GTPases or to the upstream kinases spleen-associated tyrosine kinase (SYK) and Lck/Yes-related novel tyrosine kinase (LYN). The sensitivity of the PLCγ2 variants to BTK itself has remained unknown. Here, using genetically-modified DT40 B lymphocytes, along with various biochemical assays, including analysis of PLCγ2-mediated inositol phosphate formation, inositol phospholipid assessments, fluorescence recovery after photobleaching (FRAP) static laser microscopy, and determination of intracellular calcium ([Ca2+]i), we show that various CLL-specific PLCγ2 variants such as PLCγ2S707Y are hyper-responsive to activated BTK, even in the absence of BTK's catalytic activity and independently of enhanced PLCγ2 phospholipid substrate supply. At high levels of B-cell receptor (BCR) activation, which may occur in individual CLL patients, catalytically-inactive BTK restored the ability of the BCR to mediate increases in [Ca2+]i. Because catalytically-inactive BTK is insensitive to active-site BTK inhibitors, the mechanism involving the noncatalytic BTK uncovered here may contribute to preexisting reduced sensitivity or even primary resistance of CLL to these drugs. Full Article
ria G{alpha}q splice variants mediate phototransduction, rhodopsin synthesis, and retinal integrity in Drosophila [Signal Transduction] By feedproxy.google.com Published On :: 2020-04-24T06:08:45-07:00 Heterotrimeric G proteins mediate a variety of signaling processes by coupling G protein–coupled receptors to intracellular effector molecules. In Drosophila, the Gαq gene encodes several Gαq splice variants, with the Gαq1 isoform protein playing a major role in fly phototransduction. However, Gαq1 null mutant flies still exhibit a residual light response, indicating that other Gαq splice variants or additional Gq α subunits are involved in phototransduction. Here, we isolated a mutant fly with no detectable light responses, decreased rhodopsin (Rh) levels, and rapid retinal degeneration. Using electrophysiological and genetic studies, biochemical assays, immunoblotting, real-time RT-PCR, and EM analysis, we found that mutations in the Gαq gene disrupt light responses and demonstrate that the Gαq3 isoform protein is responsible for the residual light response in Gαq1 null mutants. Moreover, we report that Gαq3 mediates rhodopsin synthesis. Depletion of all Gαq splice variants led to rapid light-dependent retinal degeneration, due to the formation stable Rh1-arrestin 2 (Arr2) complexes. Our findings clarify essential roles of several different Gαq splice variants in phototransduction and retinal integrity in Drosophila and reveal that Gαq3 functions in rhodopsin synthesis. Full Article
ria NAD+ biosynthesis in bacteria is controlled by global carbon/nitrogen levels via PII signaling [Microbiology] By feedproxy.google.com Published On :: 2020-05-01T00:06:09-07:00 NAD+ is a central metabolite participating in core metabolic redox reactions. The prokaryotic NAD synthetase enzyme NadE catalyzes the last step of NAD+ biosynthesis, converting nicotinic acid adenine dinucleotide (NaAD) to NAD+. Some members of the NadE family use l-glutamine as a nitrogen donor and are named NadEGln. Previous gene neighborhood analysis has indicated that the bacterial nadE gene is frequently clustered with the gene encoding the regulatory signal transduction protein PII, suggesting a functional relationship between these proteins in response to the nutritional status and the carbon/nitrogen ratio of the bacterial cell. Here, using affinity chromatography, bioinformatics analyses, NAD synthetase activity, and biolayer interferometry assays, we show that PII and NadEGln physically interact in vitro, that this complex relieves NadEGln negative feedback inhibition by NAD+. This mechanism is conserved in distantly related bacteria. Of note, the PII protein allosteric effector and cellular nitrogen level indicator 2-oxoglutarate (2-OG) inhibited the formation of the PII-NadEGln complex within a physiological range. These results indicate an interplay between the levels of ATP, ADP, 2-OG, PII-sensed glutamine, and NAD+, representing a metabolic hub that may balance the levels of core nitrogen and carbon metabolites. Our findings support the notion that PII proteins act as a dissociable regulatory subunit of NadEGln, thereby enabling the control of NAD+ biosynthesis according to the nutritional status of the bacterial cell. Full Article
ria Spectral and photochemical diversity of tandem cysteine cyanobacterial phytochromes [Plant Biology] By feedproxy.google.com Published On :: 2020-05-08T03:41:14-07:00 The atypical trichromatic cyanobacterial phytochrome NpTP1 from Nostoc punctiforme ATCC 29133 is a linear tetrapyrrole (bilin)-binding photoreceptor protein that possesses tandem-cysteine residues responsible for shifting its light-sensing maximum to the violet spectral region. Using bioinformatics and phylogenetic analyses, here we established that tandem-cysteine cyanobacterial phytochromes (TCCPs) compose a well-supported monophyletic phytochrome lineage distinct from prototypical red/far-red cyanobacterial phytochromes. To investigate the light-sensing diversity of this family, we compared the spectroscopic properties of NpTP1 (here renamed NpTCCP) with those of three phylogenetically diverged TCCPs identified in the draft genomes of Tolypothrix sp. PCC7910, Scytonema sp. PCC10023, and Gloeocapsa sp. PCC7513. Recombinant photosensory core modules of ToTCCP, ScTCCP, and GlTCCP exhibited violet-blue–absorbing dark-states consistent with dual thioether-linked phycocyanobilin (PCB) chromophores. Photoexcitation generated singly-linked photoproduct mixtures with variable ratios of yellow-orange and red-absorbing species. The photoproduct ratio was strongly influenced by pH and by mutagenesis of TCCP- and phytochrome-specific signature residues. Our experiments support the conclusion that both photoproduct species possess protonated 15E bilin chromophores, but differ in the ionization state of the noncanonical “second” cysteine sulfhydryl group. We found that the ionization state of this and other residues influences subsequent conformational change and downstream signal transmission. We also show that tandem-cysteine phytochromes present in eukaryotes possess similar amino acid substitutions within their chromophore-binding pocket, which tune their spectral properties in an analogous fashion. Taken together, our findings provide a roadmap for tailoring the wavelength specificity of plant phytochromes to optimize plant performance in diverse natural and artificial light environments. Full Article
ria Crystallographic and kinetic analyses of the FdsBG subcomplex of the cytosolic formate dehydrogenase FdsABG from Cupriavidus necator [Molecular Biophysics] By feedproxy.google.com Published On :: 2020-05-08T03:41:14-07:00 Formate oxidation to carbon dioxide is a key reaction in one-carbon compound metabolism, and its reverse reaction represents the first step in carbon assimilation in the acetogenic and methanogenic branches of many anaerobic organisms. The molybdenum-containing dehydrogenase FdsABG is a soluble NAD+-dependent formate dehydrogenase and a member of the NADH dehydrogenase superfamily. Here, we present the first structure of the FdsBG subcomplex of the cytosolic FdsABG formate dehydrogenase from the hydrogen-oxidizing bacterium Cupriavidus necator H16 both with and without bound NADH. The structures revealed that the two iron-sulfur clusters, Fe4S4 in FdsB and Fe2S2 in FdsG, are closer to the FMN than they are in other NADH dehydrogenases. Rapid kinetic studies and EPR measurements of rapid freeze-quenched samples of the NADH reduction of FdsBG identified a neutral flavin semiquinone, FMNH•, not previously observed to participate in NADH-mediated reduction of the FdsABG holoenzyme. We found that this semiquinone forms through the transfer of one electron from the fully reduced FMNH−, initially formed via NADH-mediated reduction, to the Fe2S2 cluster. This Fe2S2 cluster is not part of the on-path chain of iron-sulfur clusters connecting the FMN of FdsB with the active-site molybdenum center of FdsA. According to the NADH-bound structure, the nicotinamide ring stacks onto the re-face of the FMN. However, NADH binding significantly reduced the electron density for the isoalloxazine ring of FMN and induced a conformational change in residues of the FMN-binding pocket that display peptide-bond flipping upon NAD+ binding in proper NADH dehydrogenases. Full Article
ria Wish you were here: Meetings, no meetings, meeting reports [Editorial] By feedproxy.google.com Published On :: 2020-04-17T00:06:05-07:00 We've all been saying it: These are unprecedented times. The impacts of the COVID-19 pandemic are incredibly wide-ranging and affect all facets of life. One that is hitting the scientific community very hard is the cancellation of meetings, large and small. While we are well-versed in connecting with colleagues and collaborators across a variety of online platforms, these do not replace the immensely gratifying aspects of attending meetings in person: the pleasure of catching up with old friends and making new ones, the insights gained from having real-time conversations with others working on the same topic but with different expertise and perspectives, and the stimulating new scientific ideas we carry home. We have all been feeling the disappointment as we learn that one meeting after another is forced to cancel, from the vibrant ASBMB annual meeting to summer conferences of all types.Another loss from the appropriate but painful decision to cancel the ASBMB annual meeting was the chance to hear from our Herbert Tabor Early Career Investigator Awardees, who represent the best science published in JBC in the preceding year. This year, the competition was particularly fierce. We hope and anticipate that we will be able to hear from the winners at next year's ASBMB annual meeting. But in the meantime, we want to raise a toast to Wenchao Zhao, Yue Yang, Manisha Dagar, Febin Varghese, and Ayumi Nagashima-Kasahara as our 2020 winners. We've captured their award-winning 2019 papers (1–5) on the JBC website (6), and extended profiles of the... Full Article
ria Civil society perspectives on sexual violence in conflict: patriarchy and war strategy in Colombia By feedproxy.google.com Published On :: Wed, 04 Mar 2020 13:31:21 +0000 4 March 2020 , Volume 96, Number 2 Anne-Kathrin Kreft Read Online In international policy circles, conflict-related sexual violence (CRSV) is commonly viewed as a weapon of war, a framing that researchers have criticized as overly simplistic. Feminist scholars in particular caution that the ‘weapon of war’ framing decontextualizes sexual violence in conflict from the structural factors of gender inequality that underpin its perpetration. In light of these tensions, how do politically relevant local actors perceive the nature and the origins of conflict-related sexual violence? Civil society organizations often actively confront conflict-related sexual violence on the ground. A better understanding of how their perceptions of this violence align or clash with the globally dominant ‘weapon of war’ narratives therefore has important policy implications. Interviews with representatives of Colombian women's organizations and victims' associations reveal that these civil society activists predominantly view conflict-related sexual violence as the result of patriarchal structures. The mobilized women perceive sexual violence as a very gendered violence that exists on a continuum extending through peace, the everyday and war, and which the presence of arms exacerbates. Strategic sexual violence, too, is understood to ultimately have its basis in patriarchal structures. The findings expose a disconnect between the globally dominant ‘weapon of war’ understanding that is decontextualized from structural factors and a local approach to CRSV that establishes clear linkages to societal gender inequality. Full Article
ria Soundscapes of war: the audio-visual performance of war by Shi'a militias in Iraq and Syria By feedproxy.google.com Published On :: Thu, 07 May 2020 09:16:54 +0000 7 May 2020 , Volume 96, Number 3 Helle Malmvig Read online This article sets out to bring sound and music to the field of visual studies in International Relations. It argues that IR largely has approached the visual field as if it was without sound; neglecting how audial landscapes frame and direct our interpretation of moving imagery. Sound and music contribute to making imagery intelligible to us, we ‘hear the pictures’ often without noticing. The audial can for instance articulate a visual absence, or blast visual signs, bring out certain emotional stages or subjects’ inner life. Audial frames steer us in distinct directions, they can mute the cries of the wounded in war, or amplify the sounds of joy of soldiers shooting in the air. To bring the audial and the visual analytically and empirically together, the article therefore proposes four key analytical themes: 1) the audial–visual frame, 2) point of view/point of audition, 3) modes of audio-visual synchronization and 4) aesthetics moods. These are applied to a study of ‘war music videos’ in Iraq and Syria made and circulated by Shi'a militias currently fighting there. Such war music videos, it is suggested, are not just artefacts of popular culture, but have become integral parts of how warfare is practiced today, and one that is shared by soldiers in the US and Europe. War music videos are performing war, just as they shape how war is known by spectators and participants alike. Full Article
ria Webinar: Idlib at Risk – Doctors and First Responders in Northwest Syria By feedproxy.google.com Published On :: Thu, 16 Apr 2020 08:55:01 +0000 Members Event Webinar 23 April 2020 - 5:00pm to 6:00pm Online Event participants Dr Munzer al-Khalil, Head, Idlib Health DirectorateRaed Al Saleh, Director, Syria Civil Defence (The White Helmets)Alaa Rajaa Mughrabieh, Child Protection Officer, Hurras NetworkChair: Dr Lina Khatib, Director, Middle East and North Africa Programme, Chatham House In Syria, uncertainty about the safety of the ceasefire agreed between Russia and Turkey last month is inhibiting 1 million people who have been displaced since December 2019 from returning home.The looming COVID-19 global health crisis threatens to further devastate those most vulnerable as the conditions in northwest Syria’s refugee camps make it hard to practice common social distancing guidelines. Added to this, the medical infrastructure in the region has been decimated after years of bombings which has disabled over 70 health facilities since April 2019.This webinar highlights the potentially catastrophic risks of a coronavirus outbreak in Idlib and displacement camps in northwest Syria by speaking with medical and civil society actors working in the region. How are doctors and local humanitarian organizations scaling up their medical and prevention response to the COVID-19 outbreak?What key supplies such as ventilators, testing kits and critical sanitary equipment are still lacking? And how can the international community step in to help mitigate the potentially devastating consequences of an outbreak in these refugee camps?This event is run in collaboration with The Syria Campaign, a human rights organization working with Syrian civil society to raise the voices of those struggling for democracy, and support frontline activists and humanitarians. Full Article
ria Webinar: Breaking the Cycle of Violence: Transitional Justice for the Victims of ISIS in Syria By feedproxy.google.com Published On :: Wed, 06 May 2020 09:05:01 +0000 Research Event 12 May 2020 - 2:00pm to 3:00pmAdd to CalendariCalendar Outlook Google Yahoo Haid Haid, Senior Consulting Fellow, Middle East and North Africa Programme, Chatham HouseSara Kayyali, Syria Researcher, Middle East and North Africa Division, Human Rights WatchModerator: Lina Khatib, Director, Middle East and North Africa Programme, Chatham House You can register your interest here. Alternatively, you can watch the webinar live on the MENA Programme Facebook page.Following the territorial defeat of Islamic State of Iraq and Syria (ISIS) in northeastern Syria, the Kurdish-led autonomous administration in the region is now grappling with the task of quickly dealing with thousands of the group’s detained members while bringing justice to their victims. To that end, local authorities are focusing on the use of counterterrorism laws and courts to charge captured ISIS members and determine their guilt accordingly.In a recent research paper, author Haid Haid argues that this approach to justice is deeply flawed as it raises concerns about due process and lacks the precise instruments to determine the personal responsibility of ISIS individuals for specific crimes, or for their role in war crimes committed by the group. The paper proposes that a ‘transitional justice’ approach could provide judicial and non-judicial instruments to establish accountability for ISIS crimes and reduce community resistance to the reintegration of group members.In this webinar, part of the MENA Programme’s Online Event Series, speakers will examine the benefits of such an approach to justice for overcoming the limitations of the current, counterterrorism-focused framework. Panelists will discuss the alternative mechanisms local authorities and their key foreign backers can use to hold local ISIS members to account while contributing to the healing of communities. The event will be held on the record. Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email Department/project Middle East and North Africa Programme, Syria from Within Full Article
Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email
ria Webinar: International Humanitarian Law Amid Coronavirus By feedproxy.google.com Published On :: Thu, 07 May 2020 09:20:01 +0000 Members Event Webinar 15 May 2020 - 1:00pm to 2:00pmAdd to CalendariCalendar Outlook Google Yahoo Emanuela-Chiara Gillard, Associate Fellow, International Law Programme, Chatham HouseChair: Chanu Peiris, Programme Manager, International Law Programme, Chatham HouseFurther speakers to be announced. In April 2020, UN Secretary General Antonio Guterres called for a global ceasefire in order for communities and states to focus efforts on responding to the coronavirus outbreak. The consequences of armed conflict – including displacement, detention, lack of access to health services and disrupted social infrastructures – mean that those in conflict-ridden areas are amongst the most vulnerable to the virus. Observing international humanitarian law (IHL) could be one way of safeguarding against, at least, the provision of vital medical supplies and personnel for vulnerable groups. Against the backdrop of a growing health and economic emergency that is otherwise dominating government agendas, how do we emphasise the importance of humanitarian action and guarantee - or improve - compliance?The panellists will discuss the remit and limitations of international humanitarian law and how the pandemic might complicate compliance. What is the framework for humanitarian action under international humanitarian law? What are the challenges to delivering relief? And how has COVID-19 impacted humanitarian action in conflict-ridden areas?This event is for Chatham House members only. Not a member? Find out more. Full Article
ria The Golan Heights: ripples of civil war in Israel's little piece of Syria By feedproxy.google.com Published On :: Thu, 05 Jun 2014 16:12:56 +0000 5 June 2014 , Volume 70, Number 3 The Golan Heights is home to thousands of Druze who cling on tenaciously while looking over their shoulder at the chaos in their homeland Phillips1.jpg Israeli soldiers deployed on the border look towards Syria. Photo: Menahem Kahana/AFP/Getty Full Article
ria The Crisis in Syria from the Perspective of Syrian Kurds By feedproxy.google.com Published On :: Wed, 16 Jul 2014 13:09:56 +0000 Research Event 20 May 2014 - 10:00am to 2:00pm Chatham House, London Meeting Summarypdf | 99.4 KB Event participants Salih Muslim, Chairman, Democratic Union Party (PYD), Syria This expert-level meeting will bring together policy-makers, analysts and Chatham House experts to discuss the crisis in Syria from the perspective of Syrian Kurds. Salih Muslim is a prominent member of the Kurdish opposition in Syria and chairman of the Democratic Union Party (PYD), which controls Rojava, an autonomous administration area in northern Syria. He is also the deputy coordinator of the National Coordination Committee for Democratic Change. At this roundtable he will discuss the movement for a political settlement and prospects for a Kurdish democratic model in Syria.To enable as open a debate as possible, the question and answer session will be held under the Chatham House Rule. Event attributes Chatham House Rule Department/project Middle East and North Africa Programme, Syria and its Neighbours Full Article
ria Syria Showcases the Failure to Engage Locals in Development By feedproxy.google.com Published On :: Thu, 20 Aug 2015 10:03:40 +0000 20 August 2015 Kholoud Mansour Former Academy Associate The problems of the international humanitarian response in the war-torn country are part of a broader difficulty in connecting development with local sustainability. 20150820UNSyriaEnvoys.jpg UN Deputy Special Envoy to Syria Ramzy Ezzeldin Ramzy, UNDP Representative in Syria Yacoub al-Helo and the commissioner general of UNRWA, Pierre Krahenbuhl, answer questions during an interview on 14 April 2015 in Damascus. Photo by Getty Images. The international community’s response to the Syria crisis has been unsatisfactory on many fronts, and humanitarian aid and development is no exception. While there has been renewed emphasis by development organizations on the importance of engaging local actors − notably highlighted in the new Sustainable Development Goals − the reality is this has been woefully lacking in practice. And Syria is simply one example of many where the failure of UN agencies and other humanitarian actors to partner with local actors has hampered the response to humanitarian crises.Double standardsThe problem is that international agencies usually have high and unfair expectations from Syrian individuals and organizations, requiring them to speak the ‘language’ of development, meet international standards, and demonstrate a wide range of expertise. However, these demands are not reciprocated by international organizations and experts being expected to have the same depth of knowledge of the local context in which they are operating. In addition, while Syrian actors are expected to be neutral, impartial and politically unaffiliated, foreign aid appears to be driven − explicitly and unashamedly − by the political objectives of the donor countries.There is a double standard at work. In many cases, international ‘experts’ on Syria have little local knowledge, but there are no channels to measure or question their level of expertise. At the same time, including local Syrians in decision-making is seen as a threat to predetermined objectives, rather than as an asset.Syrians could add an indispensable source of knowledge and context to international agencies, as well as add local credibility. But too often they are brought on board to be part of the humanitarian and development picture or to get their simple feedback for evaluation and needs assessment reports to satisfy donors’ requirements, rather than employed as an integral component of designing and implementing projects. Though some of this is down to a pretext of lack of capacity, it raises the question of whether there is an international political willingness and genuine organizational courage to involve Syrians at programming, decision and policy making-levels.The importance of localThe Syrian example is not isolated. While there is now a debate to encourage engaging local actors, this does not happen in practice. The Local to Global Protection Initiative study reported that local and national humanitarian actors received only 0.2% of the overall direct global humanitarian response in 2013.Moreover, the international humanitarian and development systems are designed, together with foreign aid policy, to be self-contained and to exclude local actors. This allows donor governments to use the systems as political tools for leveraging control. It is equally difficult for both outsiders as well as insiders to understand how the system really functions. The UN-led coordination structure is one example of the heavy international architecture that remains unable to reform itself, learn from its previous mistakes, or to engage with local actors.And that engagement matters. The Independent Research Forum emphasized in its brief in February 2014 how engaging local researchers and implementing bottom-up participatory learning can make countries better prepared to achieve the post-2015 Sustainable Development Goals. Those goals, as well as the upcoming World Humanitarian Summit, highlight the importance of including local actors in the humanitarian and development responses.Moving forwardFortunately, such initiatives are creating a momentum within the development community to make radical changes through bottom-up approaches that put sustainability into practice. But if the Sustainable Development Goals want to affect real change, there will have to be a significant drive to move from rhetoric and ‘intentions’ to reality and actions. Currently it seems that the international community prefers to simply maintain the current status quo. It only takes a brief reflection on how many Syrians are included in every project or programme and how many Syrians are in positions to contribute at the policy and decision-making levels to realise the scale of the impetus required to change this system. To make that change might provide an opportunity for Syrians to restore some of the ownership to the outcomes and decisions of their conflict.To comment on this article, please contact Chatham House Feedback Full Article
ria Asfari Forum: The Role of Civil Society in Tackling Sectarian and Interfaith Conflicts in the MENA Region By feedproxy.google.com Published On :: Fri, 16 Oct 2015 11:00:01 +0000 Invitation Only Research Event 12 November 2015 - 2:00pm to 5:15pm Chatham House, London Meeting Summarypdf | 102.9 KB This roundtable will explore the role of and the challenges faced by both the international community and local civil society in countering sectarian narratives in the Middle East and North Africa region. Speakers will draw on their experiences working with communities in Iraq, Lebanon, Syria, and Egypt to discuss potential contributions that can be made at the local, national, and international level in tackling the root causes of religious division and facilitating positive community relations.This inaugural Asfari Forum is sponsored by the Asfari Foundation.Attendance at this event is by invitation only. Event attributes Chatham House Rule Department/project Middle East and North Africa Programme Full Article
ria Inside Syria: Life Amidst Revolution and War By feedproxy.google.com Published On :: Mon, 14 Dec 2015 18:45:02 +0000 Members Event 28 January 2016 - 1:00pm to 2:00pm Chatham House, London Event participants Mina Al-Oraibi, Journalist on Middle East affairsRobin Yassin-Kassab, Author, Burning Country: Syrians in Revolution and WarChair: Dr Neil Quilliam, Acting Head, Middle East and North Africa Programme, Chatham House In 2011, many Syrians took to the streets of Damascus to demand the overthrow of the government of Bashar al-Assad. Today, much of Syria has become a warzone and many worry that the country is on the brink of collapse.Drawing on first-hand testimonies from opposition fighters, exiles and human rights activists, the panel will explore the complicated reality of life in present-day Syria. Looking at the militarization of the uprising, the rise of the Islamists and sectarian warfare, and the role of Syria’s government in the conflict, the speakers will discuss the issues from the grassroots to the geopolitical, including the role of the international community in bringing to an end the bloodshed.This event is now full and registration has closed. An audio recording will be made available shortly after the event has taken place. Members Events Team Email Full Article
ria Settlers in Contested Lands: Territorial Disputes and Ethnic Conflict By feedproxy.google.com Published On :: Mon, 21 Mar 2016 11:45:01 +0000 Members Event 21 April 2016 - 1:00pm to 2:00pm Chatham House London, UK Event participants Oded Haklai, Associate Professor, Department of Political Studies, Queen's University, OntarioNeophytos Loizides, Reader, University of Kent; Leverhulme Trust Research FellowMadurika Rasaratnam, Lecturer, International Conflict Analysis, University of KentChair: Evangelos Liaras, IE University, Madrid; Academy Associate, Chatham House This panel will discuss the phenomenon of settlement and the role of settlers in modern conflicts, drawing from recently published work on Israel and the West Bank, Turkish settlers in Cyprus and government run farmer settlement schemes in Sri Lanka.The panelists, experts in the respective cases, will analyse the role of settlers in mobilization and violence, the conceptual framing of settlement during negotiations and the clash of legal principles versus pragmatism for the resolution of these conflicts. Looking beyond these specific cases, the panel will also raise larger questions about settlers and settlement in international politics. Members Events Team Email Full Article
ria Syria: Destruction of Civil Society Means Dictatorship, Extremism and Displacement By feedproxy.google.com Published On :: Fri, 07 Oct 2016 08:56:47 +0000 7 October 2016 Rana Marcel Khalaf Former Academy Associate The void in governance in Syria caused by the conflict has enabled a previously oppressed civil society to rise. Now this new society is under threat. Sustained commitment from the international community is required. 2016-10-07-white-helmets-syria2.jpg Syrian civil defence volunteers, known as the White Helmets, search amid the rubble of destroyed buildings following an air strike on the rebel-held neighbourhood of Aleppo, on October 4, 2016. Photo: Getty Images. The void in governance created by the ongoing Syrian conflict has been capitalized upon by warlords, militias and extremist groups to expand and consolidate their power – but has also helped to generate activism, with new leaders born as a reaction to authoritarian governance and conflict limitations.As public social services have been taken over as war tools, local coordination committees, local councils, humanitarian support groups, citizen journalist networks, women’s groups, and more, have mushroomed across all of Syria. But this new civil society continues to be threatened by many challenges.It remains hindered by structural weakness and limited capacity - largely as a result of the legacy of Ba’athist policies, which did not allow civil society to exist in the so-called Damascus Spring, but only under the umbrella of the Government, First Lady Asma al-Assad and business NGOs (GoNGOs, FLNGOs and BoNGOs). Beyond this, civil society was limited to purely charitable and religious causes, known as “moujtamaa ahli”.In addition, Syrian civil society is often a victim of counter-terrorism legislation, with laws and regulations across many countries and institutions prohibiting Syrians from registering an organization and opening bank accounts. This makes it difficult to secure financial support in an environment where funding has already been dwindling due to a “Syria fatigue” among potential donors, and where any money available is mainly directed at large, often international, NGOs.Trust, hope and legitimacyTo reach funds, many organizations have to submit to this “NGOization” process. But even this rarely allows for civil society to foster its own interests through core funding. Civil society in Syria is treated more as a “project” with strict indicators, deals and deadlines, when working under conflict necessitates building relationships of trust with a community over time and often has to cover the direct needs on the ground to gain local legitimacy and increase effectiveness. Trust, hope and legitimacy are not aspects you can report against or cover in a sophisticated proposal.But despite such obstacles, activists and civil society groups continue to volunteer for various causes, ensuring many have not had to seek refuge elsewhere. And their work has included challenging authoritarian and extremist governance.In Aleppo in 2014, it was civil society with the support of a military faction of Jaish Al Mujahideen that helped expel ISIS. Local councils have since been providing services ranging from humanitarian aid and garbage collection to re-establishing order and resolving local conflicts, thus challenging the legitimacy of jihadist institutions.NGOs such as the Civil Defense Forces (known as the White Helmets) continually risk their lives to save others by rescuing people from bombed out buildings. On September 19, when a UN sanctioned aid convoy was attacked in Aleppo – reportedly by Russian aircraft – it was the White Helmets that responded, before then coming under attack themselves.Human rights activists, meanwhile, persist in documenting human rights abuses in the hope that the perpetrators will eventually be held accountable.However, a Syrian civil society tragedy is unfolding as their work is struggling to survive. To give but one example, Kesh Malek, one of the biggest groups running home-based schooling for children in Aleppo, has already had to close some of its schools.Lacking international protection, the fate of these children in relation to arms and radicalization is all the more alarming. Several local councils have also been much weakened, especially vis-à-vis warlords, authoritarian and/or extremists actors.At its best, the current bombing campaign serves to kill any potential alternatives to an authoritarian regime, and only boosts human suffering, radicalization and displacement.If this situation is to be reversed, international actors need to ensure security at the local Syrian level, showing that Syrian security is as important as that of Europe.This means financial security through a deeper and more sustainable capacity building and funding to civil society, and it means protecting civilians and civil society groups though the creation of a safe haven.To comment on this article, please contact Chatham House Feedback Full Article
ria Thematic Review Series: Glycerolipids. DGAT enzymes and triacylglycerol biosynthesis By feedproxy.google.com Published On :: 2008-11-01 Chi-Liang Eric YenNov 1, 2008; 49:2283-2301Thematic Reviews Full Article
ria Bile salt biotransformations by human intestinal bacteria By feedproxy.google.com Published On :: 2006-02-01 Jason M. RidlonFeb 1, 2006; 47:241-259Reviews Full Article
ria Civil society perspectives on sexual violence in conflict: patriarchy and war strategy in Colombia By feedproxy.google.com Published On :: Wed, 04 Mar 2020 13:31:21 +0000 4 March 2020 , Volume 96, Number 2 Anne-Kathrin Kreft Read Online In international policy circles, conflict-related sexual violence (CRSV) is commonly viewed as a weapon of war, a framing that researchers have criticized as overly simplistic. Feminist scholars in particular caution that the ‘weapon of war’ framing decontextualizes sexual violence in conflict from the structural factors of gender inequality that underpin its perpetration. In light of these tensions, how do politically relevant local actors perceive the nature and the origins of conflict-related sexual violence? Civil society organizations often actively confront conflict-related sexual violence on the ground. A better understanding of how their perceptions of this violence align or clash with the globally dominant ‘weapon of war’ narratives therefore has important policy implications. Interviews with representatives of Colombian women's organizations and victims' associations reveal that these civil society activists predominantly view conflict-related sexual violence as the result of patriarchal structures. The mobilized women perceive sexual violence as a very gendered violence that exists on a continuum extending through peace, the everyday and war, and which the presence of arms exacerbates. Strategic sexual violence, too, is understood to ultimately have its basis in patriarchal structures. The findings expose a disconnect between the globally dominant ‘weapon of war’ understanding that is decontextualized from structural factors and a local approach to CRSV that establishes clear linkages to societal gender inequality. Full Article
ria G{alpha}q splice variants mediate phototransduction, rhodopsin synthesis, and retinal integrity in Drosophila [Signal Transduction] By feedproxy.google.com Published On :: 2020-04-24T06:08:45-07:00 Heterotrimeric G proteins mediate a variety of signaling processes by coupling G protein–coupled receptors to intracellular effector molecules. In Drosophila, the Gαq gene encodes several Gαq splice variants, with the Gαq1 isoform protein playing a major role in fly phototransduction. However, Gαq1 null mutant flies still exhibit a residual light response, indicating that other Gαq splice variants or additional Gq α subunits are involved in phototransduction. Here, we isolated a mutant fly with no detectable light responses, decreased rhodopsin (Rh) levels, and rapid retinal degeneration. Using electrophysiological and genetic studies, biochemical assays, immunoblotting, real-time RT-PCR, and EM analysis, we found that mutations in the Gαq gene disrupt light responses and demonstrate that the Gαq3 isoform protein is responsible for the residual light response in Gαq1 null mutants. Moreover, we report that Gαq3 mediates rhodopsin synthesis. Depletion of all Gαq splice variants led to rapid light-dependent retinal degeneration, due to the formation stable Rh1-arrestin 2 (Arr2) complexes. Our findings clarify essential roles of several different Gαq splice variants in phototransduction and retinal integrity in Drosophila and reveal that Gαq3 functions in rhodopsin synthesis. Full Article
ria Breaking the Cycle of Violence: Transitional Justice for the Victims of ISIS in Syria By feedproxy.google.com Published On :: Mon, 27 Apr 2020 15:50:01 +0000 28 April 2020 This paper aims to assist the region’s local authorities, and their key foreign backers, in understanding how transitional justice can provide alternative avenues for holding local ISIS members to account while contributing to the healing of communities. Read online Download PDF Haid Haid Senior Consulting Fellow, Middle East and North Africa Programme @HaidHaid22 2020-04-28-Syria-prison.jpg A fighter with the Syrian Democratic Forces monitors prisoners accused of being affiliated with ISIS, at a prison in the northeastern Syrian city of Hassakeh on 25 October 2019. Photo: Getty Images. SummaryFollowing the territorial defeat of Islamic State of Iraq and Syria (ISIS) in northeastern Syria, the Kurdish-led autonomous administration in the region is now grappling with the task of quickly dealing with thousands of the group’s detained members while bringing justice to their victims. To that end, local authorities are focusing on the use of counterterrorism laws and courts to charge captured ISIS members and determine their guilt accordingly.The piecemeal approach to justice is deeply flawed, and raises particular concerns about due process. No precise instruments exist to determine the personal responsibility of ISIS individuals for specific crimes, or for their role in war crimes committed by the group. In any event, the scale of the crimes and the number of victims – as well as severe shortages of resources and workers – make dispensation of justice extremely difficult through the traditional legal system.Not all detained ISIS members receive prison sentences. Individuals who did not hold senior roles in the group’s apparatus and are not accused of ‘major’ crimes (in practice, largely defined as fighting for ISIS and murder) are being released under limited reconciliation deals with tribal leaders. But the involvement of local community leaders in those efforts is not enough to ensure positive results. Many victims are upset at seeing ISIS members walk free without even admitting their guilt publicly or apologizing for the pain they caused.To overcome the limitations of the current, counterterrorism-focused framework, a ‘transitional justice’ approach could provide judicial and non-judicial instruments to establish accountability for ISIS crimes and reduce community resistance to the reintegration of group members. A combination of non-judicial mechanisms such as truth commissions, missing persons’ committees, and reparations and victim-healing programmes could play a vital role in providing ISIS victims with a sense of justice while contributing to peacebuilding and stability.Ignoring the urgency of developing a long-term plan to serve justice and contribute to community healing will almost certainly allow ISIS to continue to prevent the recovery and development of northeastern Syria. This, in turn, risks undermining the stability of the country and the region at large. Department/project Middle East and North Africa Programme Full Article
ria Webinar: Breaking the Cycle of Violence: Transitional Justice for the Victims of ISIS in Syria By feedproxy.google.com Published On :: Wed, 06 May 2020 09:05:01 +0000 Research Event 12 May 2020 - 2:00pm to 3:00pmAdd to CalendariCalendar Outlook Google Yahoo Haid Haid, Senior Consulting Fellow, Middle East and North Africa Programme, Chatham HouseSara Kayyali, Syria Researcher, Middle East and North Africa Division, Human Rights WatchModerator: Lina Khatib, Director, Middle East and North Africa Programme, Chatham House You can register your interest here. Alternatively, you can watch the webinar live on the MENA Programme Facebook page.Following the territorial defeat of Islamic State of Iraq and Syria (ISIS) in northeastern Syria, the Kurdish-led autonomous administration in the region is now grappling with the task of quickly dealing with thousands of the group’s detained members while bringing justice to their victims. To that end, local authorities are focusing on the use of counterterrorism laws and courts to charge captured ISIS members and determine their guilt accordingly.In a recent research paper, author Haid Haid argues that this approach to justice is deeply flawed as it raises concerns about due process and lacks the precise instruments to determine the personal responsibility of ISIS individuals for specific crimes, or for their role in war crimes committed by the group. The paper proposes that a ‘transitional justice’ approach could provide judicial and non-judicial instruments to establish accountability for ISIS crimes and reduce community resistance to the reintegration of group members.In this webinar, part of the MENA Programme’s Online Event Series, speakers will examine the benefits of such an approach to justice for overcoming the limitations of the current, counterterrorism-focused framework. Panelists will discuss the alternative mechanisms local authorities and their key foreign backers can use to hold local ISIS members to account while contributing to the healing of communities. The event will be held on the record. Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email Department/project Middle East and North Africa Programme, Syria from Within Full Article
Reni Zhelyazkova Programme Coordinator, Middle East and North Africa Programme +44 (0)20 7314 3624 Email
ria Algeria’s Perfect Storm: COVID-19 and Its Fallout By feedproxy.google.com Published On :: Wed, 06 May 2020 19:19:54 +0000 6 May 2020 Adel Hamaizia Associate Fellow, Middle East and North Africa Programme Yahia H. Zoubir Senior Professor of International Studies, KEDGE Business School; Visiting Fellow, Brookings Doha Center Coronavirus is a godsend for Algeria’s government to introduce restrictive measures beyond those needed to contain COVID-19. But its new leaders are missing a chance to gain legitimacy, which will offset the socio-economic fallout of the drop in oil prices. 2020-05-06-Algeria-Health-Covid Algerian volunteers prepare personal protection equipment (PPE) to help combat the coronavirus epidemic in the capital Algiers. Photo by RYAD KRAMDI/AFP via Getty Images. Although protests successfully ended Abdelaziz Bouteflika’s 20-year sultanistic rule a little over one year ago, demands have been continuing to dismantle the system, get rid of the old personnel, and institute democracy.The controversial election in December of Abdelmadjid Tebboune — who has inherited a disastrous situation — has not tempered the determination of the Hirak protest movement. As a former minister and prime minister under Bouteflika, the new president has won little legitimacy, and protests have continued.Now COVID-19 is worsening already dire economic conditions, such as a sharp drop in oil prices. By the beginning of May, statistics showed 10% of confirmed cases have ended in fatality, the highest percentage in the region.Maintaining an authoritarian styleHirak had already called for the suspension of the marches — mobilising online instead — before the government’s measures, which include curfews and lockdowns, demonstrating a high sense of duty. But instead of appeasing Hirak’s demands, the government has maintained the authoritarian style of its predecessors.Tebboune released more than 5,000 prisoners on March 31 but kept prisoners of conscience and leaders of the hirak imprisoned, then subsequently imprisoned journalists and activists. It even passed a controversial penal law, that also covers fake news, and may be used to justify actions against journalists.The regime wishes to see an end to the Hirak, and rejects accusations of totalitarianism by insisting freedom and a democratic climate exist in Algeria.Tebboune’s actions contradict his praise for the ‘blessed’ hirak and his promises of instituting the rule of law. In proclaiming the measures, the government has shown disappointing leadership, acting in an authoritarian fashion.Tebboune also declared proudly that Algeria was fully prepared to fight the coronavirus epidemic, an optimistic claim given the country has only 400 intensive care unit (ICU) beds, or one per 100,000 people. Despite hundreds of billions of hydrocarbon dollars accumulating during the Bouteflika-era, Algeria’s health system ranks 173 out of 195 countries.Algerians often refer to hospitals as ‘mouroirs’, meaning ‘places for the dying’. Not only has the state failed to build modern hospitals but basic hygienic conditions are lacking, and government officials prefer being treated overseas. A 2014 project to build five university hospitals was abandoned, leaving the health sector in deplorable shape.Before Chinese assistance arrived, the glaring lack of equipment to protect caregivers and care for the sick was evident. Prime Minister Abdelaziz Djerad admitted the health system required a ‘total overhaul’. The president recently stated Algeria’s doctors are among the 'best in the world' but didn't address why almost 15,000 Algerian doctors practice in France.Strict containment measures are in sync with most countries but implementation is challenging when most people live in overcrowded urban dwellings (the average household consists of 5.9 members).Water shortages in many areas makes good hygiene and decontamination impossible, while schools and universities find online teaching difficult when many students do not possess laptops or internet connections. And only 20% of Algerians have debit cards in a cash-dominated economy because of low trust in the public-dominated banking sector, making online shopping capability low.An already declining macroeconomic situation is worsening due to COVID-19. The IMF revised its 2020 estimates for Algeria, forecasting a catastrophic contraction of -5.2% in a country where hydrocarbons account for 93% of export revenues and 60% of its budget.Foreign currency reserves are now an estimated $55 billion (expected to fall to $44billion by the end of 2020), down from $200 billion in 2014, and Algerian crude has recently traded close to production costs, with the fiscal breakeven oil price at $157.In line with its historic aversion to external borrowing, Tebboune recently ruled out seeking financial support from the ‘IMF or other foreign banks’, as he argued such borrowing undermines sovereign foreign policy because - when indebted - ‘we cannot talk about either Palestine or Western Sahara’, two causes dear to Algeria. ‘Friendly countries’ - most likely a reference to China - are said to have offered to grant loans which have been declined for now.The government is forecasted to face a 20% budget shortfall this year, but Algeria’s fiscal response to COVID-19 is actually the largest among the regional hydrocarbon exporters at an estimated 8% of GDP, compared to an average of 3.2%. However, the government revised downwards its 2020 public spending by 50% (a second cut in a month, from an initial 30% reduction), halting state projects and slashing its $41 billion import bill by 25% while expanding agricultural production. National oil company SONATRACH will also cut planned investment by half to $7 billion but plans have been revealed to develop other natural resources including gold, uranium and phosphates.But recent growth rates are insufficient to create jobs for those entering the labour market. Despite government attempts to support a rather anaemic ‘formal’ private sector, estimates are 700,000 jobs could be lost due to potential bankruptcies from reduced activity and a loss of markets abroad.Facing potential social unrest and the quasi-preservation of a tired social contract, the government has committed to upholding public sector wages - including for 50% of the civil servants told to stay home - protecting sacrosanct, unsustainable subsidies, and increasing health expenditure to strengthen the capacity to combat COVID-19.A supplementary finance law will include various measures that support businesses and the economic fallout. However, while the government is to be commended for its efforts to aid businesses, supporting large swathes of the population is challenging as approximately 50% of the workforce operate in the informal economy.Weak administrative capacity and insufficient data to implement cash transfers makes the planned ‘solidarity allowance’ of 10,000 dinars ($80) for Ramadan difficult to allocate to those who most need it (especially those in the informal sector). Families, communities, and religious organisations continue to be a social safety net.So COVID-19 has not created new problems, it has merely magnified and exacerbated the numerous inequalities and failures of the Bouteflika regime to sufficiently invest in human security (economic, food, health environmental, personal, community, and political). Typically, whenever oil prices and related earnings dwindle, the political system promises to reform and diversify the economy. Tebboune is repeating this same old tune.There are positive elements, such as the government’s realization it must initiate genuine reforms. And local enterprises have been successfully producing artificial respirators, surgical masks, and other materials. Algerians, including the Hirak, are showing great social solidarity.But the government must capitalize on these positive actions by introducing real change. Because, if not, Hirak will certainly be back in force once the crisis is over, and operating in an environment of worsening socioeconomic problems. The medicine of the past will not work. Full Article
ria Soundscapes of war: the audio-visual performance of war by Shi'a militias in Iraq and Syria By feedproxy.google.com Published On :: Thu, 07 May 2020 09:16:54 +0000 7 May 2020 , Volume 96, Number 3 Helle Malmvig Read online This article sets out to bring sound and music to the field of visual studies in International Relations. It argues that IR largely has approached the visual field as if it was without sound; neglecting how audial landscapes frame and direct our interpretation of moving imagery. Sound and music contribute to making imagery intelligible to us, we ‘hear the pictures’ often without noticing. The audial can for instance articulate a visual absence, or blast visual signs, bring out certain emotional stages or subjects’ inner life. Audial frames steer us in distinct directions, they can mute the cries of the wounded in war, or amplify the sounds of joy of soldiers shooting in the air. To bring the audial and the visual analytically and empirically together, the article therefore proposes four key analytical themes: 1) the audial–visual frame, 2) point of view/point of audition, 3) modes of audio-visual synchronization and 4) aesthetics moods. These are applied to a study of ‘war music videos’ in Iraq and Syria made and circulated by Shi'a militias currently fighting there. Such war music videos, it is suggested, are not just artefacts of popular culture, but have become integral parts of how warfare is practiced today, and one that is shared by soldiers in the US and Europe. War music videos are performing war, just as they shape how war is known by spectators and participants alike. Full Article
ria Webinar: International Humanitarian Law Amid Coronavirus By feedproxy.google.com Published On :: Thu, 07 May 2020 09:20:01 +0000 Members Event Webinar 15 May 2020 - 1:00pm to 2:00pmAdd to CalendariCalendar Outlook Google Yahoo Emanuela-Chiara Gillard, Associate Fellow, International Law Programme, Chatham HouseChair: Chanu Peiris, Programme Manager, International Law Programme, Chatham HouseFurther speakers to be announced. In April 2020, UN Secretary General Antonio Guterres called for a global ceasefire in order for communities and states to focus efforts on responding to the coronavirus outbreak. The consequences of armed conflict – including displacement, detention, lack of access to health services and disrupted social infrastructures – mean that those in conflict-ridden areas are amongst the most vulnerable to the virus. Observing international humanitarian law (IHL) could be one way of safeguarding against, at least, the provision of vital medical supplies and personnel for vulnerable groups. Against the backdrop of a growing health and economic emergency that is otherwise dominating government agendas, how do we emphasise the importance of humanitarian action and guarantee - or improve - compliance?The panellists will discuss the remit and limitations of international humanitarian law and how the pandemic might complicate compliance. What is the framework for humanitarian action under international humanitarian law? What are the challenges to delivering relief? And how has COVID-19 impacted humanitarian action in conflict-ridden areas?This event is for Chatham House members only. Not a member? Find out more. Full Article
ria Undercurrents: Episode 2 – The Calabrian Mafia and Transatlantic Relations By feedproxy.google.com Published On :: Thu, 22 Feb 2018 00:00:00 +0000 Full Article
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ria Martin Wight Memorial Lecture: The Future of Think-Tanks By feedproxy.google.com Published On :: Wed, 21 Nov 2018 00:00:00 +0000 Full Article
ria Disrupting the Humanitarian Enterprise By feedproxy.google.com Published On :: Tue, 18 Jun 2019 00:00:00 +0100 Full Article