National Health and Medical Research Council (NHMRC, Australia)
1126857
Australia
National Health and Medical Research Council (NHMRC, Australia)
1184726
Australia
National Health and Medical Research Council (NHMRC, Australia)
1150083
Australia
Japan Science and Technology
18069571
Japan
Citation
Journal: Nat Commun / Year: 2022 Title: Dynamics of GLP-1R peptide agonist engagement are correlated with kinetics of G protein activation. Authors: Giuseppe Deganutti / Yi-Lynn Liang / Xin Zhang / Maryam Khoshouei / Lachlan Clydesdale / Matthew J Belousoff / Hari Venugopal / Tin T Truong / Alisa Glukhova / Andrew N Keller / Karen J ...Authors: Giuseppe Deganutti / Yi-Lynn Liang / Xin Zhang / Maryam Khoshouei / Lachlan Clydesdale / Matthew J Belousoff / Hari Venugopal / Tin T Truong / Alisa Glukhova / Andrew N Keller / Karen J Gregory / Katie Leach / Arthur Christopoulos / Radostin Danev / Christopher A Reynolds / Peishen Zhao / Patrick M Sexton / Denise Wootten / Abstract: The glucagon-like peptide-1 receptor (GLP-1R) has broad physiological roles and is a validated target for treatment of metabolic disorders. Despite recent advances in GLP-1R structure elucidation, ...The glucagon-like peptide-1 receptor (GLP-1R) has broad physiological roles and is a validated target for treatment of metabolic disorders. Despite recent advances in GLP-1R structure elucidation, detailed mechanistic understanding of how different peptides generate profound differences in G protein-mediated signalling is still lacking. Here we combine cryo-electron microscopy, molecular dynamics simulations, receptor mutagenesis and pharmacological assays, to interrogate the mechanism and consequences of GLP-1R binding to four peptide agonists; glucagon-like peptide-1, oxyntomodulin, exendin-4 and exendin-P5. These data reveal that distinctions in peptide N-terminal interactions and dynamics with the GLP-1R transmembrane domain are reciprocally associated with differences in the allosteric coupling to G proteins. In particular, transient interactions with residues at the base of the binding cavity correlate with enhanced kinetics for G protein activation, providing a rationale for differences in G protein-mediated signalling efficacy from distinct agonists.
History
Deposition
Feb 4, 2021
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Header (metadata) release
Jan 12, 2022
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Map release
Jan 12, 2022
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Update
Jan 26, 2022
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Current status
Jan 26, 2022
Processing site: RCSB / Status: Released
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Structure visualization
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Surface view with section colored by density value
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