Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 37.85 kDa 
• Atom Count: 3142 
• Residue Count: 309 
• Unique protein chains: 1

3S06

The crystal structure of the periplasmic domain of Helicobacter pylori MotB (residues 97-256, P3121).

• DOI: 10.2210/pdb3S06/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Helicobacter pylori 26695
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2011-05-13 Released: 2012-03-14 
• Deposition Author(s): Roujeinikova, A.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.205 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 

Literature

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

• PubMed: 22120737 
• DOI: 10.1107/S0907444911041102
• Primary Citation of Related Structures:  
  3S0H, 3S02, 3S03, 3S06, 3S0Y, 3S0W


• 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.

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Related Citations: 

• Cloning, purification and crystallization of MotB, a stator component of the proton-driven bacterial flagellar motor.
  O'Neill, J., Roujeinikova, A.
  () To be published --: --

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Motility protein B	A, B	166	Helicobacter pylori 26695	Mutation(s): 0  Gene Names: HP_0816, motB
Find proteins for P56427 (Helicobacter pylori (strain ATCC 700392 / 26695)) Explore P56427  Go to UniProtKB:  P56427

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.205 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.714	α = 90
b = 70.714	β = 90
c = 143.421	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-05-13 
• Released Date: 2012-03-14 
Deposition Author(s): Roujeinikova, A.R.

Revision History 

• Version 1.0: 2012-03-14
  Type: Initial release