Atomic resolution structure of the cytoplasmic domain of Yersinia pestis YscU, a regulatory switch involved in type III secretion

Experimental Data Snapshot

  • Resolution: 1.13 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 

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Atomic Resolution Structure of the Cytoplasmic Domain of Yersinia Pestis Yscu, a Regulatory Switch Involved in Type III Secretion.

Lountos, G.T.Austin, B.P.Nallamsetty, S.Waugh, D.S.

(2009) Protein Sci 18: 467

  • DOI: https://doi.org/10.1002/pro.56
  • Primary Citation of Related Structures:  
    2JLH, 2JLI, 2JLJ

  • PubMed Abstract: 

    Crystal structures of cleaved and uncleaved forms of the YscU cytoplasmic domain, an essential component of the type III secretion system (T3SS) in Yersinia pestis, have been solved by single-wavelength anomolous dispersion and refined with X-ray diffraction data extending up to atomic resolution (1.13 A). These crystallographic studies provide structural insights into the conformational changes induced upon auto-cleavage of the cytoplasmic domain of YscU. The structures indicate that the cleaved fragments remain bound to each other. The conserved NPTH sequence that contains the site of the N263-P264 peptide bond cleavage is found on a beta-turn which, upon cleavage, undergoes a major reorientation of the loop away from the catalytic N263, resulting in altered electrostatic surface features at the site of cleavage. Additionally, a significant conformational change was observed in the N-terminal linker regions of the cleaved and noncleaved forms of YscU which may correspond to the molecular switch that influences substrate specificity. The YscU structures determined here also are in good agreement with the auto-cleavage mechanism described for the flagellar homolog FlhB and E. coli EscU.

  • Organizational Affiliation

    Macromolecular Crystallography Laboratory, National Cancer Institute at Frederick, Frederick, Maryland 21702-1201, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
YOP PROTEINS TRANSLOCATION PROTEIN123Yersinia pestisMutation(s): 0 
Find proteins for P69986 (Yersinia pestis)
Explore P69986 
Go to UniProtKB:  P69986
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69986
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.13 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.162α = 90
b = 48.162β = 90
c = 190.204γ = 120
Software Package:
Software NamePurpose
HKL-3000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-03
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance