4e1q: Difference between revisions
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==Crystal structure of Wheat Cyclophilin A at 1.25 A resolution== | |||
<StructureSection load='4e1q' size='340' side='right' caption='[[4e1q]], [[Resolution|resolution]] 1.25Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4e1q]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Triticum_aestivum Triticum aestivum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4E1Q OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4E1Q FirstGlance]. <br> | |||
==Function== | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CyP3, CyP1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4565 Triticum aestivum])</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Peptidylprolyl_isomerase Peptidylprolyl isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.2.1.8 5.2.1.8] </span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4e1q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4e1q OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4e1q RCSB], [http://www.ebi.ac.uk/pdbsum/4e1q PDBsum]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/Q93W25_WHEAT Q93W25_WHEAT]] PPIases accelerate the folding of proteins (By similarity).[RuleBase:RU000493] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides (By similarity).[RuleBase:RU004223] | [[http://www.uniprot.org/uniprot/Q93W25_WHEAT Q93W25_WHEAT]] PPIases accelerate the folding of proteins (By similarity).[RuleBase:RU000493] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides (By similarity).[RuleBase:RU004223] | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
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 x 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 A 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 A 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. | |||
Structural and biochemical characterization of the cytosolic wheat cyclophilin TaCypA-1.,Sekhon SS, Kaur H, Dutta T, Singh K, Kumari S, Kang S, Park SG, Park BC, Jeong DG, Pareek A, Woo EJ, Singh P, Yoon TS Acta Crystallogr D Biol Crystallogr. 2013 Apr;69(Pt 4):555-63. doi:, 10.1107/S0907444912051529. Epub 2013 Mar 9. PMID:23519664<ref>PMID:23519664</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Peptidylprolyl isomerase]] | [[Category: Peptidylprolyl isomerase]] | ||
[[Category: Triticum aestivum]] | [[Category: Triticum aestivum]] | ||
[[Category: Jeong, D G | [[Category: Jeong, D G]] | ||
[[Category: Sekhon, S S | [[Category: Sekhon, S S]] | ||
[[Category: Singh, P | [[Category: Singh, P]] | ||
[[Category: Woo, E J | [[Category: Woo, E J]] | ||
[[Category: Yoon, T S | [[Category: Yoon, T S]] | ||
[[Category: Isomerase]] | [[Category: Isomerase]] | ||