Structural and biochemical characterization of the cytosolic wheat cyclophilin TaCypA-1 = 빵밀유래 시토졸 시클로필린TaCypA-1의 구조 및 생화학적 특성

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Title
Structural and biochemical characterization of the cytosolic wheat cyclophilin TaCypA-1 = 빵밀유래 시토졸 시클로필린TaCypA-1의 구조 및 생화학적 특성
Author(s)
S S Sekhon; H Kaur; T Dutta; K Singh; S Kumari; Sunghyun KangSung Goo ParkByoung Chul ParkDae Gwin Jeong; A Pareek; Eui-jeon Woo; P Singh; Tae-Sung Yoon
Bibliographic Citation
Acta Crystallographica Section D-Biological Crystallography, vol. 69, no. 4, pp. 555-563
Publication Year
2013
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 78.3nM. The specific activity and catalytic efficiency (k cat/K m) of the purified TaCypA-1 were 99.06 ± 0.13nmols -1mg-1 and 2.32 × 105 M -1s-1, respectively. The structures of apo TaCypA-1 and the TaCypA-1-CsA complex were determined at 1.25 and 1.20A 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 0.96A resolution. The TaCypA-1 structure revealed the presence of a divergent loop of seven amino acids 48KSGKPLH54 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.
Keyword
cyclophilinspeptidyl-prolyl cis-trans isomeraseTriticum aestivum
ISSN
0907-4449
Publisher
Int Union Crystallography
DOI
http://dx.doi.org/10.1107/S0907444912051529
Type
Article
Appears in Collections:
Division of Biomedical Research > Disease Target Structure Research Center > 1. Journal Articles
Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
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