3A5I

Structure of the cytoplasmic domain of FlhA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of the cytoplasmic domain of FlhA and implication for flagellar type III protein export

Saijo-Hamano, Y.Imada, K.Minamino, T.Kihara, M.Shimada, M.Kitao, A.Namba, K.

(2010) Mol Microbiol 76: 260-268

  • DOI: 10.1111/j.1365-2958.2010.07097.x
  • Primary Citation of Related Structures:  
    3A5I

  • PubMed Abstract: 
  • FlhA is the largest integral membrane component of the flagellar type III protein export apparatus of Salmonella and is composed of an N-terminal transmembrane domain (FlhA(TM)) and a C-terminal cytoplasmic domain (FlhA(C)). FlhA(C) is thought to for ...

    FlhA is the largest integral membrane component of the flagellar type III protein export apparatus of Salmonella and is composed of an N-terminal transmembrane domain (FlhA(TM)) and a C-terminal cytoplasmic domain (FlhA(C)). FlhA(C) is thought to form a platform of the export gate for the soluble components to bind to for efficient delivery of export substrates to the gate. Here, we report a structure of FlhA(C) at 2.8 A resolution. FlhA(C) consists of four subdomains (A(C)D1, A(C)D2, A(C)D3 and A(C)D4) and a linker connecting FlhA(C) to FlhA(TM). The sites of temperature-sensitive (ts) mutations that impair protein export are distributed to all four domains, with half of them at subdomain interfaces. Analyses of the ts mutations and four suppressor mutations to the G368C ts mutation suggested that FlhA(C) changes its conformation for its function. Molecular dynamics simulation demonstrated an open-close motion with a 5-10 ns oscillation in the distance between A(C)D2 and A(C)D4. These results along with further mutation analyses suggest that a dynamic domain motion of FlhA(C) is essential for protein export.


    Related Citations: 
    • Crystallization and preliminary X-ray analysis of the C-terminal cytoplasmic domain of FlhA, a membrane-protein subunit of the bacterial flagellar type III protein-export apparatus
      Saijo-Hamano, Y., Imada, K., Minamino, T., Kihara, M., Macnab, R.M., Namba, K.
      (2005) Acta Crystallogr Sect F Struct Biol Cryst Commun 61: 599

    Organizational Affiliation

    Dynamic NanoMachine Project, International Cooperative Research Project, Japan Science and Technology Agency, Suita, Osaka, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar biosynthesis protein flhAAB389Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: flhASTM1913
Find proteins for P40729 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P40729 
Go to UniProtKB:  P40729
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 216.323α = 90
b = 216.323β = 90
c = 65.07γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
SOLVEphasing
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance