Structure of the spliceosomal peptidyl-prolyl cis-trans isomerase Cwc27 from Homo sapiens

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

Starting Model: experimental
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Structure and evolution of the spliceosomal peptidyl-prolyl cis-trans isomerase Cwc27.

Ulrich, A.Wahl, M.C.

(2014) Acta Crystallogr D Biol Crystallogr 70: 3110-3123

  • DOI: https://doi.org/10.1107/S1399004714021695
  • Primary Citation of Related Structures:  
    4R3E, 4R3F

  • PubMed Abstract: 

    Cwc27 is a spliceosomal cyclophilin-type peptidyl-prolyl cis-trans isomerase (PPIase). Here, the crystal structure of a relatively protease-resistant N-terminal fragment of human Cwc27 containing the PPIase domain was determined at 2.0 Å resolution. The fragment exhibits a C-terminal appendix and resides in a reduced state compared with the previous oxidized structure of a similar fragment. By combining multiple sequence alignments spanning the eukaryotic tree of life and secondary-structure prediction, Cwc27 proteins across the entire eukaryotic kingdom were identified. This analysis revealed the specific loss of a crucial active-site residue in higher eukaryotic Cwc27 proteins, suggesting that the protein evolved from a prolyl isomerase to a pure proline binder. Noting a fungus-specific insertion in the PPIase domain, the 1.3 Å resolution crystal structure of the PPIase domain of Cwc27 from Chaetomium thermophilum was also determined. Although structurally highly similar in the core domain, the C. thermophilum protein displayed a higher thermal stability than its human counterpart, presumably owing to the combined effect of several amino-acid exchanges that reduce the number of long side chains with strained conformations and create new intramolecular interactions, in particular increased hydrogen-bond networks.

  • Organizational Affiliation

    Laboratory of Structural Biochemistry, Freie Universität Berlin, Takustrasse 6, 14195 Berlin, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomerase CWC27 homolog180Homo sapiensMutation(s): 0 
Gene Names: CWC27SDCCAG10UNQ438/PRO871
UniProt & NIH Common Fund Data Resources
Find proteins for Q6UX04 (Homo sapiens)
Explore Q6UX04 
Go to UniProtKB:  Q6UX04
GTEx:  ENSG00000153015 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6UX04
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.86α = 90
b = 85.86β = 90
c = 55.02γ = 120
Software Package:
Software NamePurpose
MAR345dtbdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-19
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Database references
  • Version 1.2: 2014-12-24
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description