3K29

Structure of a putative YscO homolog CT670 from Chlamydia trachomatis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and protein-protein interaction studies on Chlamydia trachomatis protein CT670 (YscO Homolog).

Lorenzini, E.Singer, A.Singh, B.Lam, R.Skarina, T.Chirgadze, N.Y.Savchenko, A.Gupta, R.S.

(2010) J.Bacteriol. 192: 2746-2756

  • DOI: 10.1128/JB.01479-09

  • PubMed Abstract: 
  • Comparative genomic studies have identified many proteins that are found only in various Chlamydiae species and exhibit no significant sequence similarity to any protein in organisms that do not belong to this group. The CT670 protein of Chlamydia tr ...

    Comparative genomic studies have identified many proteins that are found only in various Chlamydiae species and exhibit no significant sequence similarity to any protein in organisms that do not belong to this group. The CT670 protein of Chlamydia trachomatis is one of the proteins whose genes are in one of the type III secretion gene clusters but whose cellular functions are not known. CT670 shares several characteristics with the YscO protein of Yersinia pestis, including the neighboring genes, size, charge, and secondary structure, but the structures and/or functions of these proteins remain to be determined. Although a BLAST search with CT670 did not identify YscO as a related protein, our analysis indicated that these two proteins exhibit significant sequence similarity. In this paper, we report that the CT670 crystal, solved at a resolution of 2 A, consists of a single coiled coil containing just two long helices. Gel filtration and analytical ultracentrifugation studies showed that in solution CT670 exists in both monomeric and dimeric forms and that the monomer predominates at lower protein concentrations. We examined the interaction of CT670 with many type III secretion system-related proteins (viz., CT091, CT665, CT666, CT667, CT668, CT669, CT671, CT672, and CT673) by performing bacterial two-hybrid assays. In these experiments, CT670 was found to interact only with the CT671 protein (YscP homolog), whose gene is immediately downstream of ct670. A specific interaction between CT670 and CT671 was also observed when affinity chromatography pull-down experiments were performed. These results suggest that CT670 and CT671 are putative homologs of the YcoO and YscP proteins, respectively, and that they likely form a chaperone-effector pair.


    Organizational Affiliation

    Department of Biochemistry and Biomedical Science, McMaster University, Hamilton, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative uncharacterized protein
A
169Chlamydia trachomatis (strain D/UW-3/Cx)N/A
Find proteins for O84677 (Chlamydia trachomatis (strain D/UW-3/Cx))
Go to UniProtKB:  O84677
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.240 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 83.112α = 90.00
b = 23.194β = 107.48
c = 105.624γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
PDB_EXTRACTdata extraction
DENZOdata reduction
DMphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
Blu-Icedata collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2009-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description