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An arrestin-1 surface opposite of its interface with photoactivated rhodopsin engages with enolase-1 [Protein Structure and Folding]

Arrestin-1 is the arrestin family member responsible for inactivation of the G protein–coupled receptor rhodopsin in photoreceptors. Arrestin-1 is also well-known to interact with additional protein partners and to affect other signaling cascades beyond phototransduction. In this study, we investigated one of these alternative arrestin-1 binding partners, the glycolysis enzyme enolase-1, to map the molecular contact sites between these two proteins and investigate how the binding of arrestin-1 affects the catalytic activity of enolase-1. Using fluorescence quench protection of strategically placed fluorophores on the arrestin-1 surface, we observed that arrestin-1 primarily engages enolase-1 along a surface that is opposite of the side of arrestin-1 that binds photoactivated rhodopsin. Using this information, we developed a molecular model of the arrestin-1–enolase-1 complex, which was validated by targeted substitutions of charge-pair interactions. Finally, we identified the likely source of arrestin's modulation of enolase-1 catalysis, showing that selective substitution of two amino acids in arrestin-1 can completely remove its effect on enolase-1 activity while still remaining bound to enolase-1. These findings open up opportunities for examining the functional effects of arrestin-1 on enolase-1 activity in photoreceptors and their surrounding cells.




s

Amino Acid Metabolism, {beta}-Cell Function, and Diabetes

Philip Newsholme
Dec 1, 2006; 55:S39-S47
Section II: The Muscle and Liver Connections




s

Amylin Agonists: A Novel Approach in the Treatment of Diabetes

Ole Schmitz
Dec 1, 2004; 53:S233-S238
Section V: The Incretin Pathway




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Risk Factors for Diabetic Peripheral Neuropathy and Cardiovascular Autonomic Neuropathy in the Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications (DCCT/EDIC) Study

Barbara H. Braffett
May 1, 2020; 69:1000-1010
Complications




s

The Biology of Mitochondrial Uncoupling Proteins

Sophie Rousset
Feb 1, 2004; 53:S130-S135
Section III: Mitochondria, Beta-Cell Function, and Type 2 Diabetes




s

The Histone Methyltransferase MLL1 Directs Macrophage-Mediated Inflammation in Wound Healing and Is Altered in a Murine Model of Obesity and Type 2 Diabetes

Andrew S. Kimball
Sep 1, 2017; 66:2459-2471
Immunology and Transplantation




s

A Variation on the Theme: SGLT2 Inhibition and Glucagon Secretion in Human Islets

David J. Hodson
May 1, 2020; 69:864-866
Commentaries




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Effect of a Sustained Reduction in Plasma Free Fatty Acid Concentration on Intramuscular Long-Chain Fatty Acyl-CoAs and Insulin Action in Type 2 Diabetic Patients

Mandeep Bajaj
Nov 1, 2005; 54:3148-3153
Metabolism




s

AMPK: A Target for Drugs and Natural Products With Effects on Both Diabetes and Cancer

D. Grahame Hardie
Jul 1, 2013; 62:2164-2172
Perspectives in Diabetes




s

The High-Fat Diet-Fed Mouse: A Model for Studying Mechanisms and Treatment of Impaired Glucose Tolerance and Type 2 Diabetes

Maria Sörhede Winzell
Dec 1, 2004; 53:S215-S219
Section V: The Incretin Pathway




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Muscle Weakness: A Progressive Late Complication in Diabetic Distal Symmetric Polyneuropathy

Christer S. Andreassen
Mar 1, 2006; 55:806-812
Complications




s

MicroRNA Networks in Pancreatic Islet Cells: Normal Function and Type 2 Diabetes

Lena Eliasson
May 1, 2020; 69:804-812
Small Noncoding RNAs in Diabetes




s

Sugar, Uric Acid, and the Etiology of Diabetes and Obesity

Richard J. Johnson
Oct 1, 2013; 62:3307-3315
Perspectives in Diabetes




s

Nicotine and Insulin Resistance: When the Smoke Clears

Mandeep Bajaj
Dec 1, 2012; 61:3078-3080
Commentary




s

Pancreas Pathology of Latent Autoimmune Diabetes in Adults (LADA) in Patients and in a LADA Rat Model Compared With Type 1 Diabetes

Anne Jörns
Apr 1, 2020; 69:624-633
Islet Studies




s

Visceral Fat Adipokine Secretion Is Associated With Systemic Inflammation in Obese Humans

Luigi Fontana
Apr 1, 2007; 56:1010-1013
Metabolism




s

Systeme International (SI) Units Table


Oct 1, 1992; 41:1368-1369
System[egrave] International (SI) Units Table




s

The Incretin Approach for Diabetes Treatment: Modulation of Islet Hormone Release by GLP-1 Agonism

Jens Juul Holst
Dec 1, 2004; 53:S197-S204
Section V: The Incretin Pathway




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Insulin Regulates Brain Function, but How Does It Get There?

Sarah M. Gray
Dec 1, 2014; 63:3992-3997
Perspectives in Diabetes




s

Evidence Against an Important Role of Plasma Insulin and Glucagon Concentrations in the Increase in EGP Caused by SGLT2 Inhibitors

Mariam Alatrach
Apr 1, 2020; 69:681-688
Pathophysiology




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A Phenotypic Screen Identifies Calcium Overload as a Key Mechanism of {beta}-Cell Glucolipotoxicity

Jennifer Vogel
May 1, 2020; 69:1032-1041
Pharmacology and Therapeutics




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Mechanisms of {beta}-Cell Death in Type 2 Diabetes

Marc Y. Donath
Dec 1, 2005; 54:S108-S113
Section III: Inflammation and beta-Cell Death




s

Type 2 Diabetes: Demystifying the Global Epidemic

Ranjit Unnikrishnan
Jun 1, 2017; 66:1432-1442
Perspectives in Diabetes




s

Changes in Gut Microbiota Control Metabolic Endotoxemia-Induced Inflammation in High-Fat Diet-Induced Obesity and Diabetes in Mice

Patrice D. Cani
Jun 1, 2008; 57:1470-1481
Metabolism




s

Environmental Triggers and Determinants of Type 1 Diabetes

Mikael Knip
Dec 1, 2005; 54:S125-S136
Section IV: Polygenic Disease and Environment




s

Insulin Resistance and Type 2 Diabetes

Roy Taylor
Apr 1, 2012; 61:778-779
Commentary




s

Predictors of Postpartum Diabetes in Women With Gestational Diabetes Mellitus

Kristian Löbner
Mar 1, 2006; 55:792-797
Pathophysiology




s

PPARA Polymorphism Influences the Cardiovascular Benefit of Fenofibrate in Type 2 Diabetes: Findings From ACCORD-Lipid

Mario Luca Morieri
Apr 1, 2020; 69:771-783
Genetics/Genomes/Proteomics/Metabolomics




s

The cGAS-cGAMP-STING Pathway: A Molecular Link Between Immunity and Metabolism

Juli Bai
Jun 1, 2019; 68:1099-1108
Perspectives in Diabetes




s

Intense Exercise Has Unique Effects on Both Insulin Release and Its Roles in Glucoregulation: Implications for Diabetes

Errol B. Marliss
Feb 1, 2002; 51:S271-S283
Section 6: Pusatile and Phasic Insulin Release in Normal and Diabetic Men




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A Bivariate Genome-Wide Approach to Metabolic Syndrome: STAMPEED Consortium

Aldi T. Kraja
Apr 1, 2011; 60:1329-1339
Genetics




s

Vitamin D Receptor Overexpression in {beta}-Cells Ameliorates Diabetes in Mice

Meritxell Morró
May 1, 2020; 69:927-939
Islet Studies




s

Is Sugar Addictive?

George A. Bray
Jul 1, 2016; 65:1797-1799
Commentaries




s

The Rise of Childhood Type 1 Diabetes in the 20th Century

Edwin A.M. Gale
Dec 1, 2002; 51:3353-3361
Perspectives in Diabetes




s

ACE2 and Diabetes: ACE of ACEs?

Daniel Batlle
Dec 1, 2010; 59:2994-2996
Commentaries




s

Effect of a High-Protein, Low-Carbohydrate Diet on Blood Glucose Control in People With Type 2 Diabetes

Mary C. Gannon
Sep 1, 2004; 53:2375-2382
Pathophysiology




s

Mechanisms of Pancreatic {beta}-Cell Death in Type 1 and Type 2 Diabetes: Many Differences, Few Similarities

Miriam Cnop
Dec 1, 2005; 54:S97-S107
Section III: Inflammation and beta-Cell Death




s

Metabolic Endotoxemia Initiates Obesity and Insulin Resistance

Patrice D. Cani
Jul 1, 2007; 56:1761-1772
Obesity Studies




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One Week of Bed Rest Leads to Substantial Muscle Atrophy and Induces Whole-Body Insulin Resistance in the Absence of Skeletal Muscle Lipid Accumulation

Marlou L. Dirks
Oct 1, 2016; 65:2862-2875
Metabolism




s

Protecting the Heart in Obesity: Role of ACE2 and Its Partners

Rhian M. Touyz
Jan 1, 2016; 65:19-21
Commentaries




s

Autoantibodies in Diabetes

Catherine Pihoker
Dec 1, 2005; 54:S52-S61
Section II: Type 1-Related Forms of Diabetes




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Low-Grade Systemic Inflammation and the Development of Type 2 Diabetes: The Atherosclerosis Risk in Communities Study

Bruce B. Duncan
Jul 1, 2003; 52:1799-1805
Pathophysiology




s

Five Stages of Evolving Beta-Cell Dysfunction During Progression to Diabetes

Gordon C. Weir
Dec 1, 2004; 53:S16-S21
Section I: Insulin Resistance-Beta-Cell Connection in Type 2 Diabetes




s

From the Triumvirate to the Ominous Octet: A New Paradigm for the Treatment of Type 2 Diabetes Mellitus

Ralph A. DeFronzo
Apr 1, 2009; 58:773-795
Banting Lecture




s

Diabetes in China: Epidemiology and Genetic Risk Factors and Their Clinical Utility in Personalized Medication

Cheng Hu
Jan 1, 2018; 67:3-11
Perspectives in Diabetes




s

The Multiple Actions of GLP-1 on the Process of Glucose-Stimulated Insulin Secretion

Patrick E. MacDonald
Dec 1, 2002; 51:S434-S442
Section 5: Beta-Cell Stimulus-Secretion Coupling: Hormonal and Pharmacological Modulators




s

The Pathobiology of Diabetic Complications: A Unifying Mechanism

Michael Brownlee
Jun 1, 2005; 54:1615-1625
Banting Lecture 2004




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Latent Autoimmune Diabetes in Adults: Definition, Prevalence, {beta}-Cell Function, and Treatment

Gunnar Stenström
Dec 1, 2005; 54:S68-S72
Section II: Type 1-Related Forms of Diabetes




s

Poverty and Obesity in the U.S.

James A. Levine
Nov 1, 2011; 60:2667-2668
Editorials




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A Polymorphism in the Glucocorticoid Receptor Gene, Which Decreases Sensitivity to Glucocorticoids In Vivo, Is Associated With Low Insulin and Cholesterol Levels

Elisabeth F.C. van Rossum
Oct 1, 2002; 51:3128-3134
Genetics