4FHR

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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
  • Primary Citation of Related Structures:  
    4FHR

  • 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, FliM, FliN, and FliG ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar motor switch protein FliMA187Thermotoga maritimaMutation(s): 0 
Gene Names: fliM
UniProt
Find proteins for Q9WZE6 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Explore Q9WZE6 
Go to UniProtKB:  Q9WZE6
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar motor switch protein FliGB216Thermotoga maritimaMutation(s): 0 
Gene Names: fliG
UniProt
Find proteins for Q9WY63 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Explore Q9WY63 
Go to UniProtKB:  Q9WY63
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.96α = 90
b = 45.72β = 100.85
c = 98.84γ = 90
Software Package:
Software NamePurpose
BOSdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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