7N0K

Cryo-EM structure of TACAN in the apo form (TMEM120A)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Analysis of the mechanosensor channel functionality of TACAN.

Niu, Y.Tao, X.Vaisey, G.Olinares, P.D.B.Alwaseem, H.Chait, B.T.MacKinnon, R.

(2021) Elife 10

  • DOI: https://doi.org/10.7554/eLife.71188
  • Primary Citation of Related Structures:  
    7N0K, 7N0L

  • PubMed Abstract: 

    Mechanosensitive ion channels mediate transmembrane ion currents activated by mechanical forces. A mechanosensitive ion channel called TACAN was recently reported. We began to study TACAN with the intent to understand how it senses mechanical forces and functions as an ion channel. Using cellular patch-recording methods, we failed to identify mechanosensitive ion channel activity. Using membrane reconstitution methods, we found that TACAN, at high protein concentrations, produces heterogeneous conduction levels that are not mechanosensitive and are most consistent with disruptions of the lipid bilayer. We determined the structure of TACAN using single-particle cryo-electron microscopy and observed that it is a symmetrical dimeric transmembrane protein. Each protomer contains an intracellular-facing cleft with a coenzyme A cofactor, confirmed by mass spectrometry. The TACAN protomer is related in three-dimensional structure to a fatty acid elongase, ELOVL7. Whilst its physiological function remains unclear, we anticipate that TACAN is not a mechanosensitive ion channel.


  • Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, New York, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ion channel TACANA [auth B],
B [auth A]
343Mus musculusMutation(s): 0 
Gene Names: Tmem120aNet29Tacan
Membrane Entity: Yes 
UniProt
Find proteins for Q8C1E7 (Mus musculus)
Explore Q8C1E7 
Go to UniProtKB:  Q8C1E7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8C1E7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC2.9.0
MODEL REFINEMENTPHENIX1.151.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM43949

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-15
    Type: Initial release