2XCB

Crystal structure of PcrH in complex with the chaperone binding region of PopD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Basis of Chaperone Recognition of Type III Secretion System Minor Translocator Proteins.

Job, V.Mattei, P.-J.Lemaire, D.Attree, I.Dessen, A.

(2010) J Biol Chem 285: 23224

  • DOI: https://doi.org/10.1074/jbc.M110.111278
  • Primary Citation of Related Structures:  
    2XCB, 2XCC

  • PubMed Abstract: 

    The type III secretion system (T3SS) is a complex nanomachine employed by many Gram-negative pathogens, including the nosocomial agent Pseudomonas aeruginosa, to inject toxins directly into the cytoplasm of eukaryotic cells. A key component of all T3SS is the translocon, a proteinaceous channel that is inserted into the target membrane, which allows passage of toxins into target cells. In most bacterial species, two distinct membrane proteins (the "translocators") are involved in translocon formation, whereas in the bacterial cytoplasm, however, they remain associated to a common chaperone. To date, the strategy employed by a single chaperone to recognize two distinct translocators is unknown. Here, we report the crystal structure of a complex between the Pseudomonas translocator chaperone PcrH and a short region from the minor translocator PopD. PcrH displays a 7-helical tetratricopeptide repeat fold that harbors the PopD peptide within its concave region, originally believed to be involved in recognition of the major translocator, PopB. Point mutations introduced into the PcrH-interacting region of PopD impede translocator-chaperone recognition in vitro and lead to impairment of bacterial cytotoxicity toward macrophages in vivo. These results indicate that T3SS translocator chaperones form binary complexes with their partner molecules, and the stability of their interaction regions must be strictly maintained to guarantee bacterial infectivity. The PcrH-PopD complex displays homologs among a number of pathogenic strains and could represent a novel, potential target for antibiotic development.


  • Organizational Affiliation

    Bacterial Pathogenesis Group, Institut de Biologie Structurale, UMR 5075, CNRS/Commissariat à l'Enérgie Atomique/Université Joseph Fourier, 41 Rue Jules Horowitz, 38027 Grenoble, France.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
REGULATORY PROTEIN PCRH
A, B
142Pseudomonas aeruginosaMutation(s): 0 
UniProt
Find proteins for Q9I325 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I325 
Go to UniProtKB:  Q9I325
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I325
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
PEPD10Pseudomonas aeruginosaMutation(s): 0 
UniProt
Find proteins for O50280 (Pseudomonas aeruginosa)
Explore O50280 
Go to UniProtKB:  O50280
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO50280
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NO3
Query on NO3

Download Ideal Coordinates CCD File 
D [auth B]NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.37α = 90
b = 97.72β = 90
c = 73.59γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-05
    Type: Initial release
  • Version 1.1: 2012-10-03
    Changes: Derived calculations, Version format compliance