3k9v

Crystal structure of rat mitochondrial P450 24A1 S57D in complex with CHAPS

spinqualitylabelsall models 3k9v, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3k9v is a 2 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CPS, HEM Related: 3k9y Gene: Cyp24, Cyp24a1 (Buffalo rat) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CP24A_RAT] Has a role in maintaining calcium homeostasis. Catalyzes the NADPH-dependent 24-hydroxylation of calcidiol (25-hydroxyvitamin D(3)) and calcitriol (1-alpha,25-dihydroxyvitamin D(3)). The enzyme can perform up to 6 rounds of hydroxylation of calcitriol leading to calcitroic acid. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Cytochrome P450 (CYP) 24A1 catalyzes the side-chain oxidation of the hormonal form of vitamin D. Expression of CYP24A1 is up-regulated to attenuate vitamin D signaling associated with calcium homeostasis and cellular growth processes. The development of therapeutics for disorders linked to vitamin D insufficiency would be greatly facilitated by structural knowledge of CYP24A1. Here, we report the crystal structure of rat CYP24A1 at 2.5 A resolution. The structure exhibits an open cleft leading to the active-site heme prosthetic group on the distal surface that is likely to define the path of substrate access into the active site. The entrance to the cleft is flanked by conserved hydrophobic residues on helices A' and G', suggesting a mode of insertion into the inner mitochondrial membrane. A docking model for 1alpha,25-dihydroxyvitamin D(3) binding in the open form of CYP24A1 that clarifies the structural determinants of secosteroid recognition and validates the predictive power of existing homology models of CYP24A1 is proposed. Analysis of CYP24A1's proximal surface identifies the determinants of adrenodoxin recognition as a constellation of conserved residues from helices K, K, and L that converge with an adjacent lysine-rich loop for binding the redox protein. Overall, the CYP24A1 structure provides the first template for understanding membrane insertion, substrate binding, and redox partner interaction in mitochondrial P450s. Crystal structure of CYP24A1, a mitochondrial cytochrome P450 involved in vitamin D metabolism.,Annalora AJ, Goodin DB, Hong WX, Zhang Q, Johnson EF, Stout CD J Mol Biol. 2010 Feb 19;396(2):441-51. Epub 2009 Dec 1. PMID:19961857 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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