8Z4G | pdb_00008z4g

Structure of the S-ring region of the Vibrio flagellar MS-ring protein FliF with 35-fold symmetry applied


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.23 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural analysis of S-ring composed of FliFG fusion proteins in marine Vibrio polar flagellar motor.

Takekawa, N.Nishikino, T.Kishikawa, J.I.Hirose, M.Kinoshita, M.Kojima, S.Minamino, T.Uchihashi, T.Kato, T.Imada, K.Homma, M.

(2024) mBio 15: e0126124-e0126124

  • DOI: https://doi.org/10.1128/mbio.01261-24
  • Primary Citation of Related Structures:  
    8Z4D, 8Z4G

  • PubMed Abstract: 

    The marine bacterium Vibrio alginolyticus possesses a polar flagellum driven by a sodium ion flow. The main components of the flagellar motor are the stator and rotor. The C-ring and MS-ring, which are composed of FliG and FliF, respectively, are parts of the rotor. Here, we purified an MS-ring composed of FliF-FliG fusion proteins and solved the near-atomic resolution structure of the S-ring-the upper part of the MS-ring-using cryo-electron microscopy. This is the first report of an S-ring structure from Vibrio , whereas, previously, only those from Salmonella have been reported. The Vibrio S-ring structure reveals novel features compared with that of Salmonella , such as tilt angle differences of the RBM3 domain and the β-collar region, which contribute to the vertical arrangement of the upper part of the β-collar region despite the diversity in the RBM3 domain angles. Additionally, there is a decrease of the inter-subunit interaction between RBM3 domains, which influences the efficiency of the MS-ring formation in different bacterial species. Furthermore, although the inner-surface electrostatic properties of Vibrio and Salmonella S-rings are altered, the residues potentially interacting with other flagellar components, such as FliE and FlgB, are well structurally conserved in the Vibrio S-ring. These comparisons clarified the conserved and non-conserved structural features of the MS-ring across different species.IMPORTANCEUnderstanding the structure and function of the flagellar motor in bacterial species is essential for uncovering the mechanisms underlying bacterial motility and pathogenesis. Our study revealed the structure of the Vibrio S-ring, a part of its polar flagellar motor, and highlighted its unique features compared with the well-studied Salmonella S-ring. The observed differences in the inter-subunit interactions and in the tilt angles between the Vibrio and Salmonella S-rings highlighted the species-specific variations and the mechanism for the optimization of MS-ring formation in the flagellar assembly. By concentrating on the region where the S-ring and the rod proteins interact, we uncovered conserved residues essential for the interaction. Our research contributes to the advancement of bacterial flagellar biology.


  • Organizational Affiliation

    Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar M-ring protein,Flagellar motor switch protein FliG945Vibrio alginolyticusMutation(s): 1 
Gene Names: fliFVag1382_20710fliGAL468_14360JOS67_04865
UniProt
Find proteins for A0A0T7EAG0 (Vibrio diabolicus)
Explore A0A0T7EAG0 
Go to UniProtKB:  A0A0T7EAG0
Find proteins for Q75N27 (Vibrio alginolyticus)
Explore Q75N27 
Go to UniProtKB:  Q75N27
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ75N27A0A0T7EAG0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.23 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of Science (JSPS)Japan21H00393
Japan Society for the Promotion of Science (JSPS)Japan21H01772
Japan Society for the Promotion of Science (JSPS)Japan22K18943
Japan Society for the Promotion of Science (JSPS)Japan20H03220

Revision History  (Full details and data files)

  • Version 1.0: 2024-09-04
    Type: Initial release
  • Version 1.1: 2025-03-19
    Changes: Data collection, Database references, Structure summary