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In our computational study, we use molecular simulations to substantiate a hypothetical mechanism for glycosidic bond cleavage in the presence of a single catalytic acid at the active site of the mutant D10N HiCel45A. In addition to discussing this plausible mechanism from the context of structurally related MltA lytic transglycosylase and subfamily C GH45s, we also suggest the implications of the plausible mechanism for our current understanding of the action of expansins and lytic transglycosylases. As correctly pointed out by Professor Cosgrove (1), there is large body of evidence, a significant portion of which was regrettably not discussed in our paper, that suggests that expansins are incapable of lytic action on polysaccharide substrates. Whereas these insights do not change the results or the conclusions of our article, we would like to thank Professor Cosgrove for these additional insights. In particular, our main point with respect to expansins is that our results suggest the possibility that expansins are capable of nonhydrolytic lytic activity. Our intention was not to suggest this was the mechanism of expansins, but that it should be considered based on our results and the similarity of the active sites.The molecular mechanisms of how expansins enable cell wall expansion remains to be fully understood. Whereas our proposed mechanism resulting in the formation of the 1,6-anhdro product might be found in expansins and might contribute to the mode of action of expansins, we would like to emphasize that the intent of this study was only to suggest this as a...

From their simulations of endoglucanase Cel45A, Bharadwaj et al. (1) propose that structurally related expansins and MltA may cut glycan backbones without generating reducing ends. This is tenable for MltA, a peptidoglycan lytic transglycosylase whose action produces nonreducing 1,6-anhydro products, but is untenable for expansins.Expansins loosen plant cell walls and induce wall expansion. Contrary to the assertion by Bharadwaj et al., the conclusion that expansins are not lytic is not merely based on lack of new reducing ends but is supported by multiple (negative) tests for polysaccharide cleavage that do not rely on detection of reducing ends. At least eight studies with three divergent groups of expansins document this point. For instance, α-expansin did not reduce the viscosity of various wall polysaccharide solutions, an endolytic assay that does not rely on measuring reducing ends (e.g. see Ref. 2 and other studies).Walls treated with α-expansin did not release saccharide fragments, measured by pulsed amperometric detection, which can detect nonreducing saccharides (3).In the case of β-expansins, protein treatments did not cleave the backbones of a wide range of dye-coupled cross-linked wall polysaccharides; nor did they cleave backbones of polysaccharides extracted from plant cell walls, measured by gel permeation chromatography (4).For five microbial expansins, tests with a range of dye-coupled cross-linked polysaccharides likewise did not detect lytic activity (e.g. see Ref. 5). Thus, extensive published evidence argues against lytic action by expansins, as proposed by Bharadwaj (1), and attempts to identify 1,6-anhydro products seem unlikely to succeed.

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...

Theor. Probability and Math. Statist. 99 (2020), 1-3.
Abstract, references and article information

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...

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As journal editors, we’re aware of the fact that we have a role to play in scientific discourse - that’s why The BMJ has been so keen to talk about the way in which scientific knowledge is constructed, through our Evidence Manifesto. We also know that money has influence in the scientific literature - which is why we have a zero tolerance policy...

If you’re lucky enough to not be back at work, you might be feeling like you need to quickly refresh your medical knowledge - and this podcast the BMJ’s education editors take you on a whistlestop tour through the BMJ’s education articles of 2019. Tom Nolan (GP in London) is joined by Navjoyt Ladher (GP in London), Anita Jain (GP in India) and...

Itamar Raz
Jun 1, 2013; 36:1779-1788
Diabetes Care Expert Forum

William T. Cefalu
Jan 1, 2018; 41:14-31
Diabetes Care Expert Forum

William T. Cefalu
Jan 1, 2018; 41:14-31
Diabetes Care Expert Forum

The ADA Board of Trustees has authorized the searches for the next editor of The Journal of the American Dental Association and the founding editor of JADA Open, a new peer-reviewed, open-access journal spanning basic and clinical sciences to advance research in oral health.

Dr. Michael Glick, professor in oral diagnostic sciences at the University at Buffalo School of Dental Medicine, is stepping down as editor of The Journal of the American Dental Association effective March 31.

Islands -- Australia -- Government policy.

Bats.

Graphic novels -- History and criticism.

Aboriginal Australians -- Names.

Caterpillars -- Australia, Southern -- Identification -- Pictorial works.

Feminism and art.

Adelaide Festival -- History.

London : Health Education Council, 1985.

Rockville, Maryland : National Institute on Drug Abuse, 1976.

Rockville, Maryland : The National Institute on Drug Abuse, 1976.

Rockville, Maryland : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Alcohol, Drug Abuse and Mental Health Administration, 1976.

Rockville, Maryland : The National Institute on Drug Abuse, 1977.

Rockville, Maryland : National Institute on Drug Abuse, 1979.

Rockville, Maryland : National Institute on Drug Abuse, 1981.

Rockville, Maryland : National Institute on Drug Abuse, 1982.

Rockville, Maryland : National Institute on Drug Abuse, 1983.

Rockville, Maryland : National Institute on Drug Abuse, 1984.

Rockville, Maryland : National Institute on Drug Abuse, 1985.

Rockville, Maryland : National Institute on Drug Abuse, 1985.

Rockville, Maryland : National Institute of Drug Abuse, 1985.

Rockville, Maryland : National Institute on Drug Abuse, 1986.

Rockville, Maryland : National Institute on Drug Abuse, 1986.

Rockville, Maryland : National Institute on Drug Abuse, 1986.