Crystal structure of Wheat Cyclophilin A at 1.25 A resolution

Experimental Data Snapshot

  • Resolution: 1.25 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 

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Structural and biochemical characterization of the cytosolic wheat cyclophilin TaCypA-1

Sekhon, S.S.Kaur, H.Dutta, T.Singh, K.Kumari, S.Kang, S.Park, S.G.Park, B.C.Jeong, D.G.Pareek, A.Woo, E.J.Singh, P.Yoon, T.S.

(2013) Acta Crystallogr D Biol Crystallogr 69: 555-563

  • DOI: https://doi.org/10.1107/S0907444912051529
  • Primary Citation of Related Structures:  
    4E1Q, 4HY7

  • PubMed Abstract: 

    Cyclophilins belong to a family of proteins that bind to the immunosuppressive drug cyclosporin A (CsA). Several members of this protein family catalyze the cis-trans isomerization of peptide bonds preceding prolyl residues. The present study describes the biochemical and structural characteristics of a cytosolic cyclophilin (TaCypA-1) cloned from wheat (Triticum aestivum L.). Purified TaCypA-1 expressed in Escherichia coli showed peptidyl-prolyl cis-trans isomerase activity, which was inhibited by CsA with an inhibition constant of 78.3 nM. The specific activity and catalytic efficiency (kcat/Km) of the purified TaCypA-1 were 99.06 ± 0.13 nmol s(-1) mg(-1) and 2.32 × 10(5) M(-1) s(-1), respectively. The structures of apo TaCypA-1 and the TaCypA-1-CsA complex were determined at 1.25 and 1.20 Å resolution, respectively, using X-ray diffraction. Binding of CsA to the active site of TaCypA-1 did not result in any significant conformational change in the apo TaCypA-1 structure. This is consistent with the crystal structure of the human cyclophilin D-CsA complex reported at 0.96 Å resolution. The TaCypA-1 structure revealed the presence of a divergent loop of seven amino acids (48)KSGKPLH(54) which is a characteristic feature of plant cyclophilins. This study is the first to elucidate the structure of an enzymatically active plant cyclophilin which shows peptidyl-prolyl cis-trans isomerase activity and the presence of a divergent loop.

  • Organizational Affiliation

    Medical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptidyl-prolyl cis-trans isomerase207Triticum aestivumMutation(s): 0 
Gene Names: CyP3CyP1
Find proteins for Q93W25 (Triticum aestivum)
Explore Q93W25 
Go to UniProtKB:  Q93W25
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93W25
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.25 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.135α = 90
b = 52.942β = 90
c = 77.767γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-07-24
    Changes: Database references