Atomic model of the bacterial flagellar hook based on docking an X-ray derived structure and terminal two alpha-helices into an 7.1 angstrom resolution cryoEM map

Experimental Data Snapshot

  • Resolution: 7.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

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This is version 1.3 of the entry. See complete history


Specific arrangement of alpha-helical coiled coils in the core domain of the bacterial flagellar hook for the universal joint function

Fujii, T.Kato, T.Namba, K.

(2009) Structure 17: 1485-1493

  • DOI: https://doi.org/10.1016/j.str.2009.08.017
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The bacterial flagellar hook is a short, highly curved tubular structure connecting the rotary motor to the filament acting as a helical propeller. The bending flexibility of the hook allows it to work as a universal joint. A partial atomic model of the hook revealed a sliding intersubunit domain interaction along the protofilament to produce bending flexibility. However, it remained unclear how the tightly packed inner core domains can still permit axial extension and compression. We report advances in cryoEM image analysis for high-resolution, high-throughput structural analysis and a density map of the hook that reveals most of the secondary structures, including the terminal alpha helices forming a coiled coil. The orientations and axial packing interactions of these two alpha helices are distinctly different from those of the filament, allowing them to have a room for axial compression and extension for bending flexibility without impairing the mechanical stability of the hook.

  • Organizational Affiliation

    Dynamic NanoMachine Project, ICORP, JST, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar hook protein flgE402Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Find proteins for P0A1J1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1J1 
Go to UniProtKB:  P0A1J1
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UniProt GroupP0A1J1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 7.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2019-10-09
    Changes: Author supporting evidence, Data collection, Database references, Other
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references, Derived calculations