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1qnh

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{{STRUCTURE_1qnh| PDB=1qnh | SCENE= }}
{{STRUCTURE_1qnh| PDB=1qnh | SCENE= }}
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'''PLASMODIUM FALCIPARUM CYCLOPHILIN (DOUBLE MUTANT) COMPLEXED WITH CYCLOSPORIN A'''
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===PLASMODIUM FALCIPARUM CYCLOPHILIN (DOUBLE MUTANT) COMPLEXED WITH CYCLOSPORIN A===
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==Overview==
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Cyclosporin A (CsA) is a potent anti-malarial compound in vitro and in vivo in mice though better known for its immunosuppressive properties in humans. Crystal structures of wild-type and a double mutant Plasmodium falciparum cyclophilin (PfCyP19 and mPfCyP19) complexed with CsA have been determined using diffraction terms to a resolution of 2.1 A (1 A=0.1 nm). The wild-type has a single PfCyP19/CsA complex per asymmetric unit in space group P1 and refined to an R-work of 0.15 and R-free of 0.19. An altered cyclophilin, with two accidental mutations, Phe120 to Leu in the CsA binding pocket and Leu171 to Trp at the C terminus, presents two complexes per asymmetric unit in the orthorhombic space group P2(1)2(1)2. This refined to an R-work of 0.18 and R-free 0.21. The mutations were identified from the crystallographic analysis and the C-terminal alteration helps to explain the different crystal forms obtained. PfCyP19 shares approximately 61 % sequence identity with human cyclophilin A (hCyPA) and the structures are similar, consisting of an eight-stranded antiparallel beta-barrel core capped by two alpha-helices. The fold creates a hydrophobic active-site, the floor of which is formed by side-chains of residues from four antiparallel beta-strands and the walls from loops and turns. We identified C-H.O hydrogen bonds between the drug and protein that may be an important feature of cyclophilins and suggest a general mode of interaction between hydrophobic molecules. Comparisons with cyclophilin-dipeptide complexes suggests that a specific C-H.O hydrogen bonding interaction may contribute to ligand binding. Residues Ser106, His99 and Asp130, located close to the active site and conserved in most cyclophilins, are arranged in a manner reminiscent of a serine protease catalytic triad. A Ser106Ala mutant was engineered to test the hypothesis that this triad contributes to CyP function. Mutant and wild-type enzymes were found to have similar catalytic properties.
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{{ABSTRACT_PUBMED_10756109}}
==About this Structure==
==About this Structure==
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[[Category: Cyclosporin some]]
[[Category: Cyclosporin some]]
[[Category: Peptidyl cis-trans isomerase]]
[[Category: Peptidyl cis-trans isomerase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:29:05 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:28:53 2008''

Revision as of 11:28, 27 July 2008

Image:1qnh.png

Template:STRUCTURE 1qnh

PLASMODIUM FALCIPARUM CYCLOPHILIN (DOUBLE MUTANT) COMPLEXED WITH CYCLOSPORIN A

Template:ABSTRACT PUBMED 10756109

About this Structure

1QNH is a Single protein structure of sequence from Plasmodium falciparum and Tolypocladium inflatum. Full crystallographic information is available from OCA.

Reference

The three-dimensional structure of a Plasmodium falciparum cyclophilin in complex with the potent anti-malarial cyclosporin A., Peterson MR, Hall DR, Berriman M, Nunes JA, Leonard GA, Fairlamb AH, Hunter WN, J Mol Biol. 2000 Apr 21;298(1):123-33. PMID:10756109

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