2GW2

Crystal structure of the peptidyl-prolyl isomerase domain of human cyclophilin G


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.217 

Starting Model: experimental
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This is version 1.6 of the entry. See complete history


Literature

Structural and biochemical characterization of the human cyclophilin family of peptidyl-prolyl isomerases.

Davis, T.L.Walker, J.R.Campagna-Slater, V.Finerty, P.J.Paramanathan, R.Bernstein, G.MacKenzie, F.Tempel, W.Ouyang, H.Lee, W.H.Eisenmesser, E.Z.Dhe-Paganon, S.

(2010) PLoS Biol 8: e1000439-e1000439

  • DOI: https://doi.org/10.1371/journal.pbio.1000439
  • Primary Citation of Related Structures:  
    1ZKC, 2ESL, 2GW2, 2HE9, 2HQ6, 2R99

  • PubMed Abstract: 

    Peptidyl-prolyl isomerases catalyze the conversion between cis and trans isomers of proline. The cyclophilin family of peptidyl-prolyl isomerases is well known for being the target of the immunosuppressive drug cyclosporin, used to combat organ transplant rejection. There is great interest in both the substrate specificity of these enzymes and the design of isoform-selective ligands for them. However, the dearth of available data for individual family members inhibits attempts to design drug specificity; additionally, in order to define physiological functions for the cyclophilins, definitive isoform characterization is required. In the current study, enzymatic activity was assayed for 15 of the 17 human cyclophilin isomerase domains, and binding to the cyclosporin scaffold was tested. In order to rationalize the observed isoform diversity, the high-resolution crystallographic structures of seven cyclophilin domains were determined. These models, combined with seven previously solved cyclophilin isoforms, provide the basis for a family-wide structure:function analysis. Detailed structural analysis of the human cyclophilin isomerase explains why cyclophilin activity against short peptides is correlated with an ability to ligate cyclosporin and why certain isoforms are not competent for either activity. In addition, we find that regions of the isomerase domain outside the proline-binding surface impart isoform specificity for both in vivo substrates and drug design. We hypothesize that there is a well-defined molecular surface corresponding to the substrate-binding S2 position that is a site of diversity in the cyclophilin family. Computational simulations of substrate binding in this region support our observations. Our data indicate that unique isoform determinants exist that may be exploited for development of selective ligands and suggest that the currently available small-molecule and peptide-based ligands for this class of enzyme are insufficient for isoform specificity.


  • Organizational Affiliation

    Structural Genomics Consortium, University of Toronto, Toronto, Ontario, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomerase G198Homo sapiensMutation(s): 2 
Gene Names: PPIG
EC: 5.2.1.8
UniProt & NIH Common Fund Data Resources
Find proteins for Q13427 (Homo sapiens)
Explore Q13427 
Go to UniProtKB:  Q13427
PHAROS:  Q13427
GTEx:  ENSG00000138398 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13427
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.432α = 90
b = 65.504β = 90
c = 69.341γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2018-02-07
    Changes: Database references
  • Version 1.5: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.6: 2023-08-30
    Changes: Data collection, Refinement description