33mer structure of the Salmonella flagella MS-ring protein FliF

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Symmetry mismatch in the MS-ring of the bacterial flagellar rotor explains the structural coordination of secretion and rotation.

Johnson, S.Fong, Y.H.Deme, J.C.Furlong, E.J.Kuhlen, L.Lea, S.M.

(2020) Nat Microbiol 5: 966-975

  • DOI: https://doi.org/10.1038/s41564-020-0703-3
  • Primary Citation of Related Structures:  
    6SCN, 6SD1, 6SD2, 6SD3, 6SD4, 6SD5

  • PubMed Abstract: 

    The bacterial flagellum is a complex self-assembling nanomachine that confers motility to the cell. Despite great variation across species, all flagella are ultimately constructed from a helical propeller that is attached to a motor embedded in the inner membrane. The motor consists of a series of stator units surrounding a central rotor made up of two ring complexes, the MS-ring and the C-ring. Despite many studies, high-resolution structural information is still lacking for the MS-ring of the rotor, and proposed mismatches in stoichiometry between the two rings have long provided a source of confusion for the field. Here, we present structures of the Salmonella MS-ring, revealing a high level of variation in inter- and intrachain symmetry that provides a structural explanation for the ability of the MS-ring to function as a complex and elegant interface between the two main functions of the flagellum-protein secretion and rotation.

  • Organizational Affiliation

    Sir William Dunn School of Pathology, University of Oxford, Oxford, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar M-ring protein560Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: C2253_19385CET98_24800D7F20_23315D7H43_03010DD95_23270DJ388_21365EKL42_10645
Membrane Entity: Yes 
Find proteins for P15928 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P15928 
Go to UniProtKB:  P15928
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15928
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 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
Medical Research Council (United Kingdom)United KingdomM011984
Wellcome TrustUnited Kingdom209194
Wellcome TrustUnited Kingdom201536
Wolfson FoundationUnited KingdomWL160052
Wellcome TrustUnited Kingdom109136

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-18
    Type: Initial release
  • Version 1.1: 2020-09-30
    Changes: Database references