1TTW

Crystal structure of the Yersinia Pestis type III secretion chaperone SycH in complex with a stable fragment of YscM2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the Yersinia pestis type III secretion chaperone SycH in complex with a stable fragment of YscM2.

Phan, J.Tropea, J.E.Waugh, D.S.

(2004) Acta Crystallogr.,Sect.D 60: 1591-1599

  • DOI: 10.1107/S0907444904017597

  • PubMed Abstract: 
  • Pathogenic Yersinia species use a type III secretion system to inject cytotoxic effector proteins directly into the cytosol of mammalian cells, where they neutralize the innate immune response by interfering with the signal-transduction pathways that ...

    Pathogenic Yersinia species use a type III secretion system to inject cytotoxic effector proteins directly into the cytosol of mammalian cells, where they neutralize the innate immune response by interfering with the signal-transduction pathways that control phagocytosis and inflammation. To be exported efficiently, some effectors must transiently associate with cognate cytoplasmic secretion chaperones. SycH is the chaperone for YopH, a potent eukaryotic-like protein tyrosine phosphatase that is essential for virulence. SycH also binds two negative regulators of type III secretion, YscM1 and YscM2, both of which share significant sequence homology with the chaperone-binding domain of YopH. Here, the structure of a complex between SycH and a stable fragment of YscM2 that was designed on the basis of limited proteolysis experiments is presented. The overall fold of SycH is very similar to the structures of other homodimeric secretion chaperones that have been determined to date. YscM2 wraps around SycH in an extended fashion, with some secondary but no tertiary structure, assuming a conformation distinct from the globular fold that it is predicted to adopt in the absence of SycH.


    Organizational Affiliation

    Protein Engineering Section, Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute at Frederick, PO Box B, Frederick, MD 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
secretion chaperone
A
138Yersinia pestisMutation(s): 0 
Gene Names: sycH
Find proteins for Q7BTX0 (Yersinia pestis)
Go to UniProtKB:  Q7BTX0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
YscM2
B
56Yersinia enterocoliticaMutation(s): 0 
Gene Names: yscM2
Find proteins for Q93KQ4 (Yersinia enterocolitica)
Go to UniProtKB:  Q93KQ4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.243 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 63.664α = 90.00
b = 63.664β = 90.00
c = 162.263γ = 120.00
Software Package:
Software NamePurpose
MAR345data collection
SOLVEphasing
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description