Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 62.67 kDa 
• Atom Count: 5063 
• Modelled Residue Count: 586 
• Deposited Residue Count: 598 
• Unique protein chains: 1

1WLG

Crystal structure of FlgE31, a major fragment of the hook protein

• DOI: 10.2210/pdb1WLG/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-06-25 Released: 2004-11-02 
• Deposition Author(s): Samatey, F.A., Matsunami, H., Imada, K., Nagashima, S., Shaikh, T.R., Thomas, D.R., DeRosier, D.J., Kitao, A., Namba, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.242 
• R-Value Work: 0.190 
• R-Value Observed: 0.193 

Literature

Structure of the bacterial flagellar hook and implication for the molecular universal joint mechanism.

Samatey, F.A., Matsunami, H., Imada, K., Nagashima, S., Shaikh, T.R., Thomas, D.R., Chen, J.Z., Derosier, D.J., Kitao, A., Namba, K.

(2004) Nature 431: 1062-1068

• PubMed: 15510139 
• DOI: 10.1038/nature02997
• Primary Citation of Related Structures:  
  1WLG


• PubMed Abstract: 
  

The bacterial flagellum is a motile organelle, and the flagellar hook is a short, highly curved tubular structure that connects the flagellar motor to the long filament acting as a helical propeller. The hook is made of about 120 copies of a single protein, FlgE, and its function as a nano-sized universal joint is essential for dynamic and efficient bacterial motility and taxis. It transmits the motor torque to the helical propeller over a wide range of its orientation for swimming and tumbling. Here we report a partial atomic model of the hook obtained by X-ray crystallography of FlgE31, a major proteolytic fragment of FlgE lacking unfolded terminal regions, and by electron cryomicroscopy and three-dimensional helical image reconstruction of the hook. The model reveals the intricate molecular interactions and a plausible switching mechanism for the hook to be flexible in bending but rigid against twisting for its universal joint function.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar hook protein flgE	A, B	299	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P0A1J1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A1J1  Go to UniProtKB:  P0A1J1

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.242 
• R-Value Work: 0.190 
• R-Value Observed: 0.193 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 128.714	α = 90
b = 49.034	β = 90
c = 96.904	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-06-25 
• Released Date: 2004-11-02 
Deposition Author(s): Samatey, F.A., Matsunami, H., Imada, K., Nagashima, S., Shaikh, T.R., Thomas, D.R., DeRosier, D.J., Kitao, A., Namba, K.

Revision History  

• Version 1.0: 2004-11-02
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2014-04-16
  Changes: Other