8XRY

Cryo-EM structure of OSCA3.1-1.1ver(Y367N-G454S-Y458I)-open/open state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.84 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

Mechanical activation opens a lipid-lined pore in OSCA ion channels.

Han, Y.Zhou, Z.Jin, R.Dai, F.Ge, Y.Ju, X.Ma, X.He, S.Yuan, L.Wang, Y.Yang, W.Yue, X.Chen, Z.Sun, Y.Corry, B.Cox, C.D.Zhang, Y.

(2024) Nature 628: 910-918

  • DOI: https://doi.org/10.1038/s41586-024-07256-9
  • Primary Citation of Related Structures:  
    8XAJ, 8XNG, 8XRY, 8XS0, 8XS4, 8XS5, 8XVX, 8XVY, 8XVZ, 8XW0, 8XW1, 8XW2, 8XW3, 8XW4

  • PubMed Abstract: 

    OSCA/TMEM63 channels are the largest known family of mechanosensitive channels 1-3 , playing critical roles in plant 4-7 and mammalian 8,9 mechanotransduction. Here we determined 44 cryogenic electron microscopy structures of OSCA/TMEM63 channels in different environments to investigate the molecular basis of OSCA/TMEM63 channel mechanosensitivity. In nanodiscs, we mimicked increased membrane tension and observed a dilated pore with membrane access in one of the OSCA1.2 subunits. In liposomes, we captured the fully open structure of OSCA1.2 in the inside-in orientation, in which the pore shows a large lateral opening to the membrane. Unusually for ion channels, structural, functional and computational evidence supports the existence of a 'proteo-lipidic pore' in which lipids act as a wall of the ion permeation pathway. In the less tension-sensitive homologue OSCA3.1, we identified an 'interlocking' lipid tightly bound in the central cleft, keeping the channel closed. Mutation of the lipid-coordinating residues induced OSCA3.1 activation, revealing a conserved open conformation of OSCA channels. Our structures provide a global picture of the OSCA channel gating cycle, uncover the importance of bound lipids and show that each subunit can open independently. This expands both our understanding of channel-mediated mechanotransduction and channel pore formation, with important mechanistic implications for the TMEM16 and TMC protein families.


  • Organizational Affiliation

    Interdisciplinary Research Center on Biology and Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CSC1-like protein ERD4
A, B
724Arabidopsis thalianaMutation(s): 3 
Gene Names: ERD4OSCA3.1At1g30360T4K22.4
Membrane Entity: Yes 
UniProt
Find proteins for Q9C8G5 (Arabidopsis thaliana)
Explore Q9C8G5 
Go to UniProtKB:  Q9C8G5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9C8G5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.84 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2022ZD0207400
Australian Research Council (ARC)AustraliaFT220100159
Australian Research Council (ARC)AustraliaDP200100860

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-10
    Type: Initial release
  • Version 1.1: 2024-04-17
    Changes: Database references
  • Version 1.2: 2024-05-08
    Changes: Database references