6RMV image
Entry Detail
PDB ID:
6RMV
Keywords:
Title:
The crystal structure of a TRP channel peptide bound to a G protein beta gamma heterodimer
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-05-07
Release Date:
2020-10-14
Method Details:
Experimental Method:
Resolution:
1.94 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Chain IDs:A
Chain Length:340
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Mutations:C68S
Chain IDs:B
Chain Length:74
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Transient receptor potential cation channel, subfamily M, member 3
Chain IDs:C
Chain Length:15
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
The structural basis for an on-off switch controlling G beta gamma-mediated inhibition of TRPM3 channels.
Proc.Natl.Acad.Sci.USA 117 29090 29100 (2020)
PMID: 33122432 DOI: 10.1073/pnas.2001177117

Abstact

TRPM3 channels play important roles in the detection of noxious heat and in inflammatory thermal hyperalgesia. The activity of these ion channels in somatosensory neurons is tightly regulated by µ-opioid receptors through the signaling of Gβγ proteins, thereby reducing TRPM3-mediated pain. We show here that Gβγ directly binds to a domain of 10 amino acids in TRPM3 and solve a cocrystal structure of this domain together with Gβγ. Using these data and mutational analysis of full-length proteins, we pinpoint three amino acids in TRPM3 and their interacting partners in Gβ1 that are individually necessary for TRPM3 inhibition by Gβγ. The 10-amino-acid Gβγ-interacting domain in TRPM3 is subject to alternative splicing. Its inclusion in or exclusion from TRPM3 channel proteins therefore provides a mechanism for switching on or off the inhibitory action that Gβγ proteins exert on TRPM3 channels.

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Primary Citation of related structures