The crystal structure of the periplasmic domain of MotB (residues 64-256).

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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Role of the MotB linker in the assembly and activation of the bacterial flagellar motor.

O'Neill, J.Xie, M.Hijnen, M.Roujeinikova, A.

(2011) Acta Crystallogr D Biol Crystallogr 67: 1009-1016

  • DOI: https://doi.org/10.1107/S0907444911041102
  • Primary Citation of Related Structures:  
    3S02, 3S03, 3S06, 3S0H, 3S0W, 3S0Y

  • PubMed Abstract: 

    Bacterial flagella are driven by an ion influx through the peptidoglycan (PG)-tethered MotA/MotB stator. Stator precomplexes assemble in the membrane and remain inactive until they incorporate into the motor, upon which MotA/MotB changes conformation. The nature of this change and the mechanism of inhibition of the PG-binding and ion-conducting activities of the precomplexes are unknown. Here, the structural analysis of a series of N-terminally truncated MotB fragments is presented, the mechanism of inhibition by the linker is identified and the structural basis for the formation of the PG-binding-competent open-channel MotA/MotB conformation via a mechanism that entails linker unfolding and rotational displacement of MotB transmembrane helices is uncovered.

  • Organizational Affiliation

    Manchester Interdisciplinary Biocentre, University of Manchester, 131 Princess Street, Manchester M1 7DN, England.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Motility protein B
A, B
193Helicobacter pylori 26695Mutation(s): 0 
Gene Names: HP_0816motB
Find proteins for P56427 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore P56427 
Go to UniProtKB:  P56427
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56427
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.21α = 90
b = 75.21β = 90
c = 124.707γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Data collection, Database references, Derived calculations