7F3U

Cryo-EM structure of human TMEM120A in the CoASH-free state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

TMEM120A contains a specific coenzyme A-binding site and might not mediate poking- or stretch-induced channel activities in cells.

Rong, Y.Jiang, J.Gao, Y.Guo, J.Song, D.Liu, W.Zhang, M.Zhao, Y.Xiao, B.Liu, Z.

(2021) Elife 10

  • DOI: https://doi.org/10.7554/eLife.71474
  • Primary Citation of Related Structures:  
    7F3T, 7F3U

  • PubMed Abstract: 

    TMEM120A, a member of the transmembrane protein 120 (TMEM120) family, has a pivotal function in adipocyte differentiation and metabolism, and may also contribute to sensing mechanical pain by functioning as an ion channel named TACAN. Here we report that expression of TMEM120A is not sufficient in mediating poking- or stretch-induced currents in cells and have solved cryo-electron microscopy (cryo-EM) structures of human TMEM120A ( Hs TMEM120A) in complex with an endogenous metabolic cofactor (coenzyme A, CoASH) and in the apo form. Hs TMEM120A forms a symmetrical homodimer with each monomer containing an amino-terminal coiled-coil motif followed by a transmembrane domain with six membrane-spanning helices. Within the transmembrane domain, a CoASH molecule is hosted in a deep cavity and forms specific interactions with nearby amino acid residues. Mutation of a central tryptophan residue involved in binding CoASH dramatically reduced the binding affinity of Hs TMEM120A with CoASH. Hs TMEM120A exhibits distinct conformations at the states with or without CoASH bound. Our results suggest that TMEM120A may have alternative functional roles potentially involved in CoASH transport, sensing, or metabolism.


  • Organizational Affiliation

    National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transmembrane protein 120A
A, B
375Homo sapiensMutation(s): 0 
Gene Names: TMEM120ATACANTMPIT
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BXJ8 (Homo sapiens)
Explore Q9BXJ8 
Go to UniProtKB:  Q9BXJ8
PHAROS:  Q9BXJ8
GTEx:  ENSG00000189077 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BXJ8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONcisTEM

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31925024
National Natural Science Foundation of China (NSFC)China31670749
Chinese Academy of SciencesChinaXDB37020101

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-30
    Type: Initial release
  • Version 1.1: 2022-01-12
    Changes: Database references
  • Version 1.2: 2024-06-12
    Changes: Data collection