Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 22.25 kDa 
• Atom Count: 1450 
• Modelled Residue Count: 170 
• Deposited Residue Count: 207 
• Unique protein chains: 1

4E1Q

Crystal structure of Wheat Cyclophilin A at 1.25 A resolution

• DOI: 10.2210/pdb4E1Q/pdb

• Classification: ISOMERASE
• Organism(s): Triticum aestivum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-03-06 Released: 2013-03-27 
• Deposition Author(s): Sekhon, S.S., Jeong, D.G., Woo, E.J., Singh, P., Yoon, T.S.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.25 Å
• R-Value Free: 0.185 
• R-Value Work: 0.177 
• R-Value Observed: 0.178 

Literature

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

• PubMed: 23519664 
• DOI: 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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Peptidyl-prolyl cis-trans isomerase	A	207	Triticum aestivum	Mutation(s): 0  Gene Names: CyP3, CyP1, TaBWCyp A-1 EC: 5.2.1.8
Find proteins for Q93W25 (Triticum aestivum) Explore Q93W25  Go to UniProtKB:  Q93W25

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 37.135	α = 90
b = 52.942	β = 90
c = 77.767	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-03-06 
• Released Date: 2013-03-27 
Deposition Author(s): Sekhon, S.S., Jeong, D.G., Woo, E.J., Singh, P., Yoon, T.S.

Revision History  

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