6DJR image
Entry Detail
PDB ID:
6DJR
EMDB ID:
Title:
Full-length human TRPC3 in GDN
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2018-05-26
Release Date:
2018-08-29
Method Details:
Experimental Method:
Resolution:
5.80 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Transient Receptor Potential Cation Channel Subfamily C Member 3
Chain IDs:A, B, C, D
Chain Length:490
Number of Molecules:4
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structure-function analyses of the ion channel TRPC3 reveal that its cytoplasmic domain allosterically modulates channel gating.
J. Biol. Chem. 293 16102 16114 (2018)
PMID: 30139744 DOI: 10.1074/jbc.RA118.005066

Abstact

The transient receptor potential ion channels support Ca2+ permeation in many organs, including the heart, brain, and kidney. Genetic mutations in transient receptor potential cation channel subfamily C member 3 (TRPC3) are associated with neurodegenerative diseases, memory loss, and hypertension. To better understand the conformational changes that regulate TRPC3 function, we solved the cryo-EM structures for the full-length human TRPC3 and its cytoplasmic domain (CPD) in the apo state at 5.8- and 4.0-Å resolution, respectively. These structures revealed that the TRPC3 transmembrane domain resembles those of other TRP channels and that the CPD is a stable module involved in channel assembly and gating. We observed the presence of a C-terminal domain swap at the center of the CPD where horizontal helices (HHs) transition into a coiled-coil bundle. Comparison of TRPC3 structures revealed that the HHs can reside in two distinct positions. Electrophysiological analyses disclosed that shortening the length of the C-terminal loop connecting the HH with the TRP helices increases TRPC3 activity and that elongating the length of the loop has the opposite effect. Our findings indicate that the C-terminal loop affects channel gating by altering the allosteric coupling between the cytoplasmic and transmembrane domains. We propose that molecules that target the HH may represent a promising strategy for controlling TRPC3-associated neurological disorders and hypertension.

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Primary Citation of related structures