8YMO

OSCA1.1-F516A pre-open 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.70 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

Activation mechanisms of dimeric mechanosensitive OSCA/TMEM63 channels.

Shan, Y.Zhang, M.Chen, M.Guo, X.Li, Y.Zhang, M.Pei, D.

(2024) Nat Commun 15: 7504-7504

  • DOI: https://doi.org/10.1038/s41467-024-51800-0
  • Primary Citation of Related Structures:  
    8YMM, 8YMN, 8YMO, 8YMP, 8YMQ

  • PubMed Abstract: 

    OSCA/TMEM63 channels, which have transporter-like architectures, are bona fide mechanosensitive (MS) ion channels that sense high-threshold mechanical forces in eukaryotic cells. The activation mechanism of these transporter-like channels is not fully understood. Here we report cryo-EM structures of a dimeric OSCA/TMEM63 pore mutant OSCA1.1-F516A with a sequentially extracellular dilated pore in a detergent environment. These structures suggest that the extracellular pore sequential dilation resembles a flower blooming and couples to a sequential contraction of each monomer subunit towards the dimer interface and subsequent extrusion of the dimer interface lipids. Interestingly, while OSCA1.1-F516A remains non-conducting in the native lipid environment, it can be directly activated by lyso-phosphatidylcholine (Lyso-PC) with reduced single-channel conductance. Structural analysis of OSCA1.1-F516A in lyso-PC-free and lyso-PC-containing lipid nanodiscs indicates that lyso-PC induces intracellular pore dilation by attracting the M6b to upward movement away from the intracellular side thus extending the intracellular pore. Further functional studies indicate that full activation of MS OSCA/TMEM63 dimeric channels by high-threshold mechanical force also involves the opening of both intercellular and extracellular pores. Our results provide the fundamental activation paradigm of the unique transporter-like MS OSCA/TMEM63 channels, which is likely applicable to functional branches of the TMEM63/TMEM16/TMC superfamilies.


  • Organizational Affiliation

    Laboratory of Cell Fate Control, School of Life Sciences, Westlake University, Hangzhou, 310000, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein OSCA1A,
B [auth C]
772Arabidopsis thalianaMutation(s): 1 
Gene Names: OSCA1OSCA1.1At4g04340T19B17.6
Membrane Entity: Yes 
UniProt
Find proteins for Q9XEA1 (Arabidopsis thaliana)
Explore Q9XEA1 
Go to UniProtKB:  Q9XEA1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9XEA1
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Released Date: 2024-10-02 
  • Deposition Author(s): Zhang, M.F.

Funding OrganizationLocationGrant Number
Other government--

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-02
    Type: Initial release