2UWJ

Structure of the heterotrimeric complex which regulates type III secretion needle formation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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This is version 1.4 of the entry. See complete history


Literature

Structure of the heterotrimeric complex that regulates type III secretion needle formation.

Quinaud, M.Ple, S.Job, V.Contreras-Martel, C.Simorre, J.P.Attree, I.Dessen, A.

(2007) Proc Natl Acad Sci U S A 104: 7803-7808

  • DOI: https://doi.org/10.1073/pnas.0610098104
  • Primary Citation of Related Structures:  
    2UWJ

  • PubMed Abstract: 

    Type III secretion systems (T3SS), found in several Gram-negative pathogens, are nanomachines involved in the transport of virulence effectors directly into the cytoplasm of target cells. T3SS are essentially composed of basal membrane-embedded ring-like structures and a hollow needle formed by a single polymerized protein. Within the bacterial cytoplasm, the T3SS needle protein requires two distinct chaperones for stabilization before its secretion, without which the entire T3SS is nonfunctional. The 2.0-A x-ray crystal structure of the PscE-PscF(55-85)-PscG heterotrimeric complex from Pseudomonas aeruginosa reveals that the C terminus of the needle protein PscF is engulfed within the hydrophobic groove of the tetratricopeptide-like molecule PscG, indicating that the macromolecular scaffold necessary to stabilize the T3SS needle is totally distinct from chaperoned complexes between pilus- or flagellum-forming molecules. Disruption of specific PscG-PscF interactions leads to impairment of bacterial cytotoxicity toward macrophages, indicating that this essential heterotrimer, which possesses homologs in a wide variety of pathogens, is a unique attractive target for the development of novel antibacterials.


  • Organizational Affiliation

    Institut de Biologie Structurale Jean-Pierre Ebel, 41 Rue Jules Horowitz, Unité Mixte de Recherche 5075, Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 38027 Grenoble, France.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TYPE III EXPORT PROTEIN PSCEA [auth E]70Pseudomonas aeruginosa CHAMutation(s): 0 
UniProt
Find proteins for Q9I317 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I317 
Go to UniProtKB:  Q9I317
Entity Groups  
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UniProt GroupQ9I317
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
TYPE III EXPORT PROTEIN PSCFB [auth F]32Pseudomonas aeruginosa CHAMutation(s): 0 
UniProt
Find proteins for P95434 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P95434 
Go to UniProtKB:  P95434
Entity Groups  
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UniProt GroupP95434
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
TYPE III EXPORT PROTEIN PSCGC [auth G]115Pseudomonas aeruginosa CHAMutation(s): 0 
UniProt
Find proteins for P95435 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P95435 
Go to UniProtKB:  P95435
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP95435
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.305α = 90
b = 85.305β = 90
c = 157.553γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-15
    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: 2018-03-28
    Changes: Database references, Source and taxonomy
  • Version 1.4: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other