EcMscK in an Open Conformation

Experimental Data Snapshot

  • Resolution: 3.48 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structural basis for mechanotransduction in a potassium-dependent mechanosensitive ion channel.

Mount, J.Maksaev, G.Summers, B.T.Fitzpatrick, J.A.J.Yuan, P.

(2022) Nat Commun 13: 6904-6904

  • DOI: https://doi.org/10.1038/s41467-022-34737-0
  • Primary Citation of Related Structures:  
    7UW5, 7UX1

  • PubMed Abstract: 

    Mechanosensitive channels of small conductance, found in many living organisms, open under elevated membrane tension and thus play crucial roles in biological response to mechanical stress. Amongst these channels, MscK is unique in that its activation also requires external potassium ions. To better understand this dual gating mechanism by force and ligand, we elucidate distinct structures of MscK along the gating cycle using cryo-electron microscopy. The heptameric channel comprises three layers: a cytoplasmic domain, a periplasmic gating ring, and a markedly curved transmembrane domain that flattens and expands upon channel opening, which is accompanied by dilation of the periplasmic ring. Furthermore, our results support a potentially unifying mechanotransduction mechanism in ion channels depicted as flattening and expansion of the transmembrane domain.

  • Organizational Affiliation

    Department of Cell Biology and Physiology, Washington University School of Medicine, Saint Louis, MO, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mechanosensitive channel MscK1,120Escherichia coli K-12Mutation(s): 1 
Gene Names: mscKaefAkefAb0465JW0454
Membrane Entity: Yes 
Find proteins for P77338 (Escherichia coli (strain K12))
Explore P77338 
Go to UniProtKB:  P77338
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP77338
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.48 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesNS099341

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-23
    Type: Initial release