Cryo-EM Structure of the Human Amylin 1 Receptor in Complex with CGRP and Gs Protein

被引:3
作者
Cao, Jianjun [1 ,2 ]
Belousoff, Matthew J. [1 ,2 ]
Danev, Radostin [3 ]
Christopoulos, Arthur [1 ,2 ]
Wootten, Denise [1 ,2 ]
Sexton, Patrick M. [1 ,2 ]
机构
[1] Monash Univ, Drug Discovery Biol Theme, Monash Inst Pharmaceut Sci, Parkville, Vic 3052, Australia
[2] Monash Univ, Monash Inst Pharmaceut Sci, ARC Ctr Cryoelectron Microscopy Membrane Prot, Parkville, Vic 3052, Australia
[3] Univ Tokyo, Grad Sch Med, Tokyo 1130033, Japan
基金
美国国家卫生研究院; 澳大利亚研究理事会;
关键词
GENE-RELATED PEPTIDE; CALCITONIN-RECEPTOR; EXTRACELLULAR LOOPS; ADRENOMEDULLIN; RCP; TERMINUS; FAMILY; GPCR;
D O I
10.1021/acs.biochem.4c00114
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Inhibition of calcitonin gene-related peptide (CGRP) or its cognate CGRP receptor (CGRPR) has arisen as a major breakthrough in the treatment of migraine. However, a second CGRP-responsive receptor exists, the amylin (Amy) 1 receptor (AMY(1)R), yet its involvement in the pathology of migraine is poorly understood. AMY(1)R and CGRPR are heterodimers consisting of receptor activity-modifying protein 1 (RAMP1) with the calcitonin receptor (CTR) and the calcitonin receptor-like receptor (CLR), respectively. Here, we present the structure of AMY(1)R in complex with CGRP and Gs protein and compare it with the reported structures of the AMY(1)R complex with rat amylin (rAmy) and the CGRPR in complex with CGRP. Despite similar protein backbones observed within the receptors and the N- and C-termini of the two peptides bound to the AMY(1)R complexes, they have distinct organization in the peptide midregions (the bypass motif) that is correlated with differences in the dynamics of the respective receptor extracellular domains. Moreover, divergent conformations of extracellular loop (ECL) 3, intracellular loop (ICL) 2, and ICL3 within the CTR and CLR protomers are evident when comparing the CGRP bound to the CGRPR and AMY(1)R, which influences the binding mode of CGRP. However, the conserved interactions made by the C-terminus of CGRP to the CGRPR and AMY(1)R are likely to account for cross-reactivity of nonpeptide CGRPR antagonists observed at AMY(1)R, which also extends to other clinically used CGRPR blockers, including antibodies.
引用
收藏
页码:1089 / 1096
页数:8
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