BipD - an invasion protein associated with the type-III secretion system of Burkholderia pseudomallei.

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.299 
  • R-Value Observed: 0.226 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


High Resolution Structure of Bipd: An Invasion Protein Associated with the Type III Secretion System of Burkholderia Pseudomallei.

Erskine, P.T.Knight, M.J.Ruaux, A.Mikolajek, H.Wong-Fat-Sang, N.Withers, J.Gill, R.Wood, S.P.Wood, M.Fox, G.C.Cooper, J.B.

(2006) J Mol Biol 363: 125

  • DOI: https://doi.org/10.1016/j.jmb.2006.07.069
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Burkoldheria pseudomallei is a Gram-negative bacterium that possesses a protein secretion system similar to those found in Salmonella and Shigella. Recent work has indicated that the protein encoded by the BipD gene of B. pseudomallei is an important secreted virulence factor. BipD is similar in sequence to IpaD from Shigella and SipD from Salmonella and is therefore likely to be a translocator protein in the type-III secretion system of B. pseudomallei. The crystal structure of BipD has been solved at a resolution of 2.1 A revealing the detailed tertiary fold of the molecule. The overall structure is appreciably extended and consists of a bundle of antiparallel alpha-helical segments with two small beta-sheet regions. The longest helices of the molecule form a four-helix bundle and most of the remaining secondary structure elements (three helices and two three-stranded beta-sheets) are formed by the region linking the last two helices of the four-helix bundle. The structure suggests that the biologically active form of the molecule may be a dimer formed by contacts involving the C-terminal alpha-helix, which is the most strongly conserved part of the protein. Comparison of the structure of BipD with immunological and other data for IpaD indicates that the C-terminal alpha-helix is also involved in contacts with other proteins that form the translocon.

  • Organizational Affiliation

    School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton, SO16 7PX, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
303Burkholderia pseudomalleiMutation(s): 0 
Find proteins for Q63K37 (Burkholderia pseudomallei (strain K96243))
Explore Q63K37 
Go to UniProtKB:  Q63K37
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ63K37
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.299 
  • R-Value Observed: 0.226 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.509α = 90
b = 56.204β = 94.47
c = 84.208γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-08-14
    Changes: Data collection, Structure summary