3WX6

Crystal structure of Type Six Secretion System protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Extended Loop Region of Hcp1 is Critical for the Assembly and Function of Type VI Secretion System in Burkholderia pseudomallei.

Lim, Y.T.Jobichen, C.Wong, J.Limmathurotsakul, D.Li, S.Chen, Y.Raida, M.Srinivasan, N.MacAry, P.A.Sivaraman, J.Gan, Y.H.

(2015) Sci Rep 5: 8235-8235

  • DOI: 10.1038/srep08235

  • PubMed Abstract: 
  • The Type VI Secretion System cluster 1 (T6SS1) is essential for the pathogenesis of Burkholderia pseudomallei, the causative agent of melioidosis, a disease endemic in the tropics. Inside host cells, B. pseudomallei escapes into the cytosol and throu ...

    The Type VI Secretion System cluster 1 (T6SS1) is essential for the pathogenesis of Burkholderia pseudomallei, the causative agent of melioidosis, a disease endemic in the tropics. Inside host cells, B. pseudomallei escapes into the cytosol and through T6SS1, induces multinucleated giant cell (MNGC) formation that is thought to be important for bacterial cell to cell spread. The hemolysin-coregulated protein (Hcp) is both a T6SS substrate, as well as postulated to form part of the T6SS secretion tube. Our structural study reveals that Hcp1 forms hexameric rings similar to the other Hcp homologs but has an extended loop (Asp40-Arg56) that deviates significantly in position compared to other Hcp structures and may act as a key contact point between adjacent hexameric rings. When two residues within the loop were mutated, the mutant proteins were unable to stack as dodecamers, suggesting defective tube assembly. Moreover, infection with a bacterial mutant containing in situ substitution of these hcp1 residues abolishes Hcp1 secretion inside infected cells and MNGC formation. We further show that Hcp has the ability to preferentially bind to the surface of antigen-presenting cells, which may contribute to its immunogenicity in inducing high titers of antibodies seen in melioidosis patients.


    Organizational Affiliation

    1] Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore [2] NUS Graduate School of Integrative Sciences and Engineering, National University of Singapore, Singapore [3] Life Sciences Institute, Immunology Program, National University of Singapore, Singapore.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein
A, B
169Burkholderia pseudomallei (strain K96243)Mutation(s): 0 
Find proteins for Q63K67 (Burkholderia pseudomallei (strain K96243))
Go to UniProtKB:  Q63K67
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.249 
  • Space Group: P 6
Unit Cell:
Length (Å)Angle (°)
a = 82.738α = 90.00
b = 82.738β = 90.00
c = 64.782γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-03-04
    Type: Initial release