3MYD

Structure of the Cytoplasmic domain of FlhA from Helicobacter pylori


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the cytoplasmic domain of the flagellar secretion apparatus component FlhA from Helicobacter pylori.

Moore, S.A.Jia, Y.

(2010) J.Biol.Chem. 285: 21060-21069

  • DOI: 10.1074/jbc.M110.119412

  • PubMed Abstract: 
  • Using x-ray crystallography we have determined the structure of the cytoplasmic fragment (residues 384-732) of the flagellum secretion system protein FlhA from Helicobacter pylori at 2.4-A resolution (r = 0.224; R(free) = 0.263). FlhA proteins and th ...

    Using x-ray crystallography we have determined the structure of the cytoplasmic fragment (residues 384-732) of the flagellum secretion system protein FlhA from Helicobacter pylori at 2.4-A resolution (r = 0.224; R(free) = 0.263). FlhA proteins and their type III secretion homologues contain an N-terminal integral membrane domain (residues 1-350), a linker segment, and a globular C-terminal cytoplasmic region. The tertiary structure of the cytoplasmic fragment contains a thioredoxin-like domain, an RNA recognition motif-like domain inserted within the thioredoxin-fold, a helical domain, and a C-terminal beta/alpha domain. Inter-domain contacts are extensive and the H. pylori FlhA structure appears to be in a closed conformation where the C-terminal domain closes against the RNA recognition motif-fold domain. Highly conserved surface residues in FlhA proteins are concentrated on a narrow surface strip comprising the thioredoxin-like and helical domains, possibly close to the export channel opening. The conformation of the FlhA N-terminal linker segment suggests a likely orientation for the FlhA cytoplasmic fragment relative to the membrane-embedded export pore. Comparison with the recently published structures of the Salmonella FlhA cytoplasmic fragment and its type III secretion counterpart InvA highlight a conformational change where the C-terminal beta/alpha domain in H. pylori FlhA moves 15 A relative to Salmonella FlhA. The conformational change is complex but primarily involves hinge-like movements of the helical and C-terminal domains. Interpretation of previous mutational screens suggest that the C-terminal domain of FlhA(C) plays a regulatory role in substrate class switching in flagellum export.


    Organizational Affiliation

    Department of Biochemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada. stan.moore@usask.ca




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar biosynthesis protein flhA
A
365Helicobacter pylori (strain ATCC 700392 / 26695)Mutation(s): 0 
Gene Names: flhA (flbA)
Find proteins for O06758 (Helicobacter pylori (strain ATCC 700392 / 26695))
Go to UniProtKB:  O06758
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.224 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 69.193α = 90.00
b = 136.200β = 90.00
c = 107.682γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SOLVEphasing
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-05-10 
  • Released Date: 2010-05-26 
  • Deposition Author(s): Moore, S.A., Jia, Y.

Revision History 

  • Version 1.0: 2010-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-11-08
    Type: Refinement description