Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.235 

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Structure of the C-terminal domain of FliG, a component of the rotor in the bacterial flagellar motor

Lloyd, S.A.Whitby, F.G.Blair, D.F.Hill, C.P.

(1999) Nature 400: 472-475

  • DOI: https://doi.org/10.1038/22794
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Many motile species of bacteria are propelled by flagella, which are rigid helical filaments turned by rotary motors in the cell membrane. The motors are powered by the transmembrane gradient of protons or sodium ions. Although bacterial flagella contain many proteins, only three-MotA, MotB and FliG-participate closely in torque generation. MotA and MotB are ion-conducting membrane proteins that form the stator of the motor. FliG is a component of the rotor, present in about 25 copies per flagellum. It is composed of an amino-terminal domain that functions in flagellar assembly and a carboxy-terminal domain (FliG-C) that functions specifically in motor rotation. Here we report the crystal structure of FliG-C from the hyperthermophilic eubacterium Thermotoga maritima. Charged residues that are important for function, and which interact with the stator protein MotA, cluster along a prominent ridge on FliG-C. On the basis of the disposition of these residues, we present a hypothesis for the orientation of FliG-C domains in the flagellar motor, and propose a structural model for the part of the rotor that interacts with the stator.

  • Organizational Affiliation

    Department of Biology, University of Utah, Salt Lake City 84112-0840, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
101Thermotoga maritimaMutation(s): 0 
Gene Names: FLIG
Find proteins for Q9WY63 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9WY63 
Go to UniProtKB:  Q9WY63
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9WY63
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.235 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.68α = 90
b = 62.44β = 90
c = 88.55γ = 90
Software Package:
Software NamePurpose
SDMSdata collection
SDMSdata reduction
SDMSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-08-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references