Crystal Structure of cpaf s499a mutant

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.257 

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Structural basis for activation and inhibition of the secreted chlamydia protease CPAF

Huang, Z.Feng, Y.Chen, D.Wu, X.Huang, S.Wang, X.Xiao, X.Li, W.Huang, N.Gu, L.Zhong, G.Chai, J.

(2008) Cell Host Microbe 4: 529-542

  • DOI: https://doi.org/10.1016/j.chom.2008.10.005
  • Primary Citation of Related Structures:  
    3DJA, 3DOR, 3DPM, 3DPN

  • PubMed Abstract: 

    The obligate intracellular pathogen Chlamydia trachomatis is the most common cause of sexually transmitted bacterial disease. It secretes a protease known as chlamydial protease/proteasome-like activity factor (CPAF) that degrades many host molecules and plays a major role in Chlamydia pathogenesis. Here, we show that mature CPAF is a homodimer of the catalytic domains, each of which comprises two distinct subunits. Dormancy of the CPAF zymogen is maintained by an internal inhibitory segment that binds the CPAF active site and blocks its homodimerization. CPAF activation is initiated by trans-autocatalytic cleavage, which induces homodimerization and conformational changes that assemble the catalytic triad. This assembly leads to two autocatalytic cleavages and removal of the inhibitory segment, enabling full CPAF activity. CPAF is covalently bound and inhibited by the proteasome inhibitor lactacystin. These results reveal the activation mechanism of the CPAF serine protease and suggest new opportunities for anti-Chlamydia drug development.

  • Organizational Affiliation

    College of Biological Sciences, China Agricultural University, Beijing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein CT_858
A, B
583Chlamydia trachomatisMutation(s): 1 
Find proteins for O84866 (Chlamydia trachomatis (strain D/UW-3/Cx))
Explore O84866 
Go to UniProtKB:  O84866
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO84866
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.257 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 192.67α = 90
b = 192.67β = 90
c = 338.87γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Refinement description