6D7L

Cytoplasmic domain of TRPC3


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structure-function analyses of the ion channel TRPC3 reveal that its cytoplasmic domain allosterically modulates channel gating.

Sierra-Valdez, F.Azumaya, C.M.Romero, L.O.Nakagawa, T.Cordero-Morales, J.F.

(2018) J. Biol. Chem. 293: 16102-16114

  • DOI: 10.1074/jbc.RA118.005066
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The transient receptor potential ion channels support Ca <sup>2+ </sup> 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 wi ...

    The transient receptor potential ion channels support Ca 2+ 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.


    Organizational Affiliation

    Vanderbilt Brain Institute, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.,From the Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee 38163 and.,From the Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee 38163 and jcordero@uthsc.edu.,Department of Molecular Physiology and Biophysics, terunaga.nakagawa@vanderbilt.edu.,Center for Structural Biology, and.,Department of Molecular Physiology and Biophysics.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Short transient receptor potential channel 3
A, B, C, D
853Homo sapiensMutation(s): 0 
Gene Names: TRPC3 (TRP3)
Find proteins for Q13507 (Homo sapiens)
Go to Gene View: TRPC3
Go to UniProtKB:  Q13507
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)United StatesR01HD061543
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM125629

Revision History 

  • Version 1.0: 2018-08-29
    Type: Initial release
  • Version 1.1: 2018-09-05
    Type: Data collection, Database references
  • Version 1.2: 2018-10-24
    Type: Data collection, Database references
  • Version 1.3: 2019-12-11
    Type: Author supporting evidence
  • Version 1.4: 2019-12-18
    Type: Other