Structure of C. trachomatis CT441

Experimental Data Snapshot

  • Resolution: 2.97 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 

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This is version 1.4 of the entry. See complete history


Structural basis of the proteolytic and chaperone activity of Chlamydia trachomatis CT441

Kohlmann, F.Shima, K.Hilgenfeld, R.Solbach, W.Rupp, J.Hansen, G.

(2015) J Bacteriol 197: 211-218

  • DOI: https://doi.org/10.1128/JB.02140-14
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Chlamydia trachomatis is the most prevalent cause of preventable blindness worldwide and a major reason for infectious infertility in females. Several bacterial factors have been implicated in the pathogenesis of C. trachomatis. Combining structural and mutational analysis, we have shown that the proteolytic function of CT441 depends on a conserved Ser/Lys/Gln catalytic triad and a functional substrate-binding site within a flexible PDZ (postsynaptic density of 95 kDa, discs large, and zonula occludens) domain. Previously, it has been suggested that CT441 is involved in modulating estrogen signaling responses of the host cell. Our results show that although in vitro CT441 exhibits proteolytic activity against SRAP1, a coactivator of estrogen receptor α, CT441-mediated SRAP1 degradation is not observed during the intracellular developmental cycle before host cells are lysed and infectious chlamydiae are released. Most compellingly, we have newly identified a chaperone activity of CT441, indicating a role of CT441 in prokaryotic protein quality control processes.

  • Organizational Affiliation

    Institute of Biochemistry, Center for Structural and Cell Biology in Medicine, University of Lübeck, Lübeck, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carboxy-terminal processing protease
A, B, C
634Chlamydia trachomatis L2/434/BuMutation(s): 1 
Gene Names: CT441CTL0700tsp
EC: 3.4.21
Find proteins for A0A0H3MDM0 (Chlamydia trachomatis serovar L2 (strain 434/Bu / ATCC VR-902B))
Explore A0A0H3MDM0 
Go to UniProtKB:  A0A0H3MDM0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H3MDM0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.97 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.73α = 90
b = 183.99β = 90
c = 209.62γ = 90
Software Package:
Software NamePurpose
MAR345data collection
PHENIXmodel building
BUCCANEERmodel building
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-05
    Type: Initial release
  • Version 1.1: 2015-06-24
    Changes: Database references
  • Version 1.2: 2015-10-28
    Changes: Other
  • Version 1.3: 2017-11-22
    Changes: Refinement description
  • Version 1.4: 2024-03-20
    Changes: Data collection, Database references