Native Crystal Structure of the Type III Secretion chaperone SycT from Yersinia enterocolitica

Experimental Data Snapshot

  • Resolution: 1.83 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

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Crystal Structure of Yersinia Enterocolitica Type III Secretion Chaperone Syct.

Buttner, C.R.Cornelis, G.R.Heinz, D.W.Niemann, H.H.

(2005) Protein Sci 14: 1993

  • DOI: https://doi.org/10.1110/ps.051474605
  • Primary Citation of Related Structures:  
    2BSH, 2BSI, 2BSJ

  • PubMed Abstract: 

    Pathogenic Yersinia species use a type III secretion (TTS) system to deliver a number of cytotoxic effector proteins directly into the mammalian host cell. To ensure effective translocation, several such effector proteins transiently bind to specific chaperones in the bacterial cytoplasm. Correspondingly, SycT is the chaperone of YopT, a cysteine protease that cleaves the membrane-anchor of Rho-GTPases in the host. We have analyzed the complex between YopT and SycT and determined the structure of SycT in three crystal forms. Biochemical studies indicate a stoichometric effector/chaperone ratio of 1:2 and the chaperone-binding site contains at least residues 52-103 of YopT. The crystal structures reveal a SycT homodimer with an overall fold similar to that of other TTS effector chaperones. In contrast to the canonical five-stranded anti-parallel beta-sheet flanked by three alpha-helices, SycT lacks the dimerization alpha-helix and has an additional beta-strand capable of undergoing a conformational change. The dimer interface consists of two beta-strands and the connecting loops. Two hydrophobic patches involved in effector binding in other TTS effector chaperones are also found in SycT. The structural similarity of SycT to other chaperones and the spatial conservation of effector-binding sites support the idea that TTS effector chaperones form a single functional and structural group.

  • Organizational Affiliation

    Division of Structural Biology, German Research Centre for Biotechnology, D-38124, Braunschweig, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
133Yersinia enterocoliticaMutation(s): 0 
Find proteins for P0C2V9 (Yersinia enterocolitica)
Explore P0C2V9 
Go to UniProtKB:  P0C2V9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C2V9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.83 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.112α = 90
b = 79.562β = 101.21
c = 52.093γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-04-03
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2019-05-15
    Changes: Data collection, Experimental preparation
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Refinement description