6VYK

Cryo-EM structure of mechanosensitive channel MscS in PC-18:1 nanodiscs


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Visualization of the mechanosensitive ion channel MscS under membrane tension.

Zhang, Y.Daday, C.Gu, R.X.Cox, C.D.Martinac, B.de Groot, B.L.Walz, T.

(2021) Nature 590: 509-514

  • DOI: https://doi.org/10.1038/s41586-021-03196-w
  • Primary Citation of Related Structures:  
    6VYK, 6VYL, 6VYM

  • PubMed Abstract: 

    Mechanosensitive channels sense mechanical forces in cell membranes and underlie many biological sensing processes 1-3 . However, how exactly they sense mechanical force remains under investigation 4 . The bacterial mechanosensitive channel of small conductance, MscS, is one of the most extensively studied mechanosensitive channels 4-8 , but how it is regulated by membrane tension remains unclear, even though the structures are known for its open and closed states 9-11 . Here we used cryo-electron microscopy to determine the structure of MscS in different membrane environments, including one that mimics a membrane under tension. We present the structures of MscS in the subconducting and desensitized states, and demonstrate that the conformation of MscS in a lipid bilayer in the open state is dynamic. Several associated lipids have distinct roles in MscS mechanosensation. Pore lipids are necessary to prevent ion conduction in the closed state. Gatekeeper lipids stabilize the closed conformation and dissociate with membrane tension, allowing the channel to open. Pocket lipids in a solvent-exposed pocket between subunits are pulled out under sustained tension, allowing the channel to transition to the subconducting state and then to the desensitized state. Our results provide a mechanistic underpinning and expand on the 'force-from-lipids' model for MscS mechanosensation 4,11 .


  • Organizational Affiliation

    Laboratory of Molecular Electron Microscopy, The Rockefeller University, New York, NY, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mechanosensitive channel MscS
A, B, C, D, E
A, B, C, D, E, F, G
286Escherichia coliMutation(s): 0 
Gene Names: mscSmscS_1
Membrane Entity: Yes 
UniProt
Find proteins for P0C0S1 (Escherichia coli (strain K12))
Explore P0C0S1 
Go to UniProtKB:  P0C0S1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C0S1
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-02-10
    Type: Initial release
  • Version 1.1: 2021-02-24
    Changes: Database references
  • Version 1.2: 2021-03-03
    Changes: Database references
  • Version 1.3: 2024-03-06
    Changes: Data collection, Database references