4FHR

Crystal structure of the complex between the flagellar motor proteins FliG and FliM.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.931 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of flagellar motor proteins in complex allows for insights into motor structure and switching.

Vartanian, A.S.Paz, A.Fortgang, E.A.Abramson, J.Dahlquist, F.W.

(2012) J.Biol.Chem. 287: 35779-35783

  • DOI: 10.1074/jbc.C112.378380

  • PubMed Abstract: 
  • The flagellar motor is one type of propulsion device of motile bacteria. The cytoplasmic ring (C-ring) of the motor interacts with the stator to generate torque in clockwise and counterclockwise directions. The C-ring is composed of three proteins, F ...

    The flagellar motor is one type of propulsion device of motile bacteria. The cytoplasmic ring (C-ring) of the motor interacts with the stator to generate torque in clockwise and counterclockwise directions. The C-ring is composed of three proteins, FliM, FliN, and FliG. Together they form the "switch complex" and regulate switching and torque generation. Here we report the crystal structure of the middle domain of FliM in complex with the middle and C-terminal domains of FliG that shows the interaction surface and orientations of the proteins. In the complex, FliG assumes a compact conformation in which the middle and C-terminal domains (FliG(MC)) collapse and stack together similarly to the recently published structure of a mutant of FliG(MC) with a clockwise rotational bias. This intramolecular stacking of the domains is distinct from the intermolecular stacking seen in other structures of FliG. We fit the complex structure into the three-dimensional reconstructions of the motor and propose that the cytoplasmic ring is assembled from 34 FliG and FliM molecules in a 1:1 fashion.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar motor switch protein FliM
A
187Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: fliM
Find proteins for Q9WZE6 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9WZE6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Flagellar motor switch protein FliG
B
216Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Mutation(s): 0 
Gene Names: fliG
Find proteins for Q9WY63 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q9WY63
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.931 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.208 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 125.960α = 90.00
b = 45.720β = 100.85
c = 98.840γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing
PHENIXmodel building
BOSdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-22
    Type: Initial release
  • Version 1.1: 2012-11-07
    Type: Database references