7P2L image
Entry Detail
PDB ID:
7P2L
Title:
thermostabilised 7TM domain of human mGlu5 receptor bound to photoswitchable ligand alloswitch-1
Biological Source:
PDB Version:
Deposition Date:
2021-07-06
Release Date:
2021-09-08
Method Details:
Experimental Method:
Resolution:
2.54 Å
R-Value Free:
0.28
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Metabotropic glutamate receptor 5,Endolysin,Metabotropic glutamate receptor 5
Mutations:E579A,N667Y,I669A,G675M,T742A,S753A
Chain IDs:A
Chain Length:464
Number of Molecules:1
Biological Source:Homo sapiens, Enterobacteria phage T4
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
YCM A CYS modified residue
Ligand Molecules
Primary Citation
Agonists and allosteric modulators promote signaling from different metabotropic glutamate receptor 5 conformations.
Cell Rep 36 109648 109648 (2021)
PMID: 34469715 DOI: 10.1016/j.celrep.2021.109648

Abstact

Metabotropic glutamate receptors (mGluRs) are dimeric G-protein-coupled receptors activated by the main excitatory neurotransmitter, L-glutamate. mGluR activation by agonists binding in the venus flytrap domain is regulated by positive (PAM) or negative (NAM) allosteric modulators binding to the 7-transmembrane domain (7TM). We report the cryo-electron microscopy structures of fully inactive and intermediate-active conformations of mGlu5 receptor bound to an antagonist and a NAM or an agonist and a PAM, respectively, as well as the crystal structure of the 7TM bound to a photoswitchable NAM. The agonist induces a large movement between the subunits, bringing the 7TMs together and stabilizing a 7TM conformation structurally similar to the inactive state. Using functional approaches, we demonstrate that the PAM stabilizes a 7TM active conformation independent of the conformational changes induced by agonists, representing an alternative mode of mGlu activation. These findings provide a structural basis for different mGluR activation modes.

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Primary Citation of related structures