8UPL

Cryo-EM structure of a Clockwise locked form of the Salmonella enterica Typhimurium flagellar C-ring, with C34 symmetry applied


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.40 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

Structural basis of directional switching by the bacterial flagellum.

Johnson, S.Deme, J.C.Furlong, E.J.Caesar, J.J.E.Chevance, F.F.V.Hughes, K.T.Lea, S.M.

(2024) Nat Microbiol 9: 1282-1292

  • DOI: https://doi.org/10.1038/s41564-024-01630-z
  • Primary Citation of Related Structures:  
    8UCS, 8UMD, 8UMX, 8UOX, 8UPL

  • PubMed Abstract: 

    The bacterial flagellum is a macromolecular protein complex that harvests energy from uni-directional ion flow across the inner membrane to power bacterial swimming via rotation of the flagellar filament. Rotation is bi-directional, with binding of a cytoplasmic chemotactic response regulator controlling reversal, though the structural and mechanistic bases for rotational switching are not well understood. Here we present cryoelectron microscopy structures of intact Salmonella flagellar basal bodies (3.2-5.5 Å), including the cytoplasmic C-ring complexes required for power transmission, in both counter-clockwise and clockwise rotational conformations. These reveal 180° movements of both the N- and C-terminal domains of the FliG protein, which, when combined with a high-resolution cryoelectron microscopy structure of the MotA 5 B 2 stator, show that the stator shifts from the outside to the inside of the C-ring. This enables rotational switching and reveals how uni-directional ion flow across the inner membrane is used to accomplish bi-directional rotation of the flagellum.


  • Organizational Affiliation

    Center for Structural Biology, CCR, NCI, Frederick, MD, USA. steven.johnson2@nih.gov.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar M-ring protein560Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
UniProt
Find proteins for P15928 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P15928 
Go to UniProtKB:  P15928
Entity Groups  
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UniProt GroupP15928
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar motor switch protein FliG328Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
UniProt
Find proteins for P0A1J9 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1J9 
Go to UniProtKB:  P0A1J9
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UniProt GroupP0A1J9
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar motor switch protein FliM334Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
UniProt
Find proteins for P26418 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P26418 
Go to UniProtKB:  P26418
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UniProt GroupP26418
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar motor switch protein FliN137Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
UniProt
Find proteins for P26419 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P26419 
Go to UniProtKB:  P26419
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UniProt GroupP26419
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.21rc1_5084

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United States--
Wellcome TrustUnited Kingdom201536
Wellcome TrustUnited Kingdom219477
Medical Research Council (MRC, United Kingdom)United KingdomS021264

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-24
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Database references
  • Version 1.2: 2024-05-22
    Changes: Database references