National Health and Medical Research Council (NHMRC, Australia)
1120919
Australia
National Health and Medical Research Council (NHMRC, Australia)
1159006
Australia
National Health and Medical Research Council (NHMRC, Australia)
1150083
Australia
Japan Science and Technology
#18069571
Japan
Takeda Science Foundation
2019 Medical Research Grant
Japan
National Science Foundation (NSF, China)
2018ZX09735-001
China
National Science Foundation (NSF, China)
2018ZX09711002-002-005
China
National Science Foundation (NSF, China)
2018ZX09711002-001
China
National Key R&D Program of China
2018YFA0507000
China
Novo Nordisk Foundation
NNCAS-2017-1-CC
Denmark
Citation
Journal: J Biol Chem / Year: 2020 Title: Cryo-electron microscopy structure of the glucagon receptor with a dual-agonist peptide. Authors: Rulue Chang / Xin Zhang / Anna Qiao / Antao Dai / Matthew J Belousoff / Qiuxiang Tan / Lijun Shao / Li Zhong / Guangyao Lin / Yi-Lynn Liang / Limin Ma / Shuo Han / Dehua Yang / Radostin ...Authors: Rulue Chang / Xin Zhang / Anna Qiao / Antao Dai / Matthew J Belousoff / Qiuxiang Tan / Lijun Shao / Li Zhong / Guangyao Lin / Yi-Lynn Liang / Limin Ma / Shuo Han / Dehua Yang / Radostin Danev / Ming-Wei Wang / Denise Wootten / Beili Wu / Patrick M Sexton / Abstract: Unimolecular dual agonists of the glucagon (GCG) receptor (GCGR) and glucagon-like peptide-1 receptor (GLP-1R) are a new class of drugs that are potentially superior to GLP-1R-specific agonists for ...Unimolecular dual agonists of the glucagon (GCG) receptor (GCGR) and glucagon-like peptide-1 receptor (GLP-1R) are a new class of drugs that are potentially superior to GLP-1R-specific agonists for the management of metabolic disease. The dual-agonist, peptide 15 (P15), is a glutamic acid 16 analog of GCG with GLP-1 peptide substitutions between amino acids 17 and 24 that has potency equivalent to those of the cognate peptide agonists at the GCGR and GLP-1R. Here, we have used cryo-EM to solve the structure of an active P15-GCGR-G complex and compared this structure to our recently published structure of the GCGR-G complex bound to GCG. This comparison revealed that P15 has a reduced interaction with the first extracellular loop (ECL1) and the top of transmembrane segment 1 (TM1) such that there is increased mobility of the GCGR extracellular domain and at the C terminus of the peptide compared with the GCG-bound receptor. We also observed a distinct conformation of ECL3 and could infer increased mobility of the far N-terminal His-1 residue in the P15-bound structure. These regions of conformational variance in the two peptide-bound GCGR structures were also regions that were distinct between GCGR structures and previously published peptide-bound structures of the GLP-1R, suggesting that greater conformational dynamics may contribute to the increased efficacy of P15 in activation of the GLP-1R compared with GCG. The variable domains in this receptor have previously been implicated in biased agonism at the GLP-1R and could result in altered signaling of P15 at the GCGR compared with GCG.
History
Deposition
Apr 7, 2020
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Header (metadata) release
May 27, 2020
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Map release
May 27, 2020
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Update
Jun 4, 2025
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Current status
Jun 4, 2025
Processing site: RCSB / Status: Released
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