Structural insights from a P450 Carrier Protein complex reveal how specificity is achieved in the P450(BioI) ACP complex.
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Cryle MJ, Schlichting I
Structural insights from a P450 Carrier Protein complex reveal how specificity is achieved in the P450(BioI) ACP complex.
Proc Natl Acad Sci U S A. 2008 Oct 14;105(41):15696-701. doi: 10.1073/pnas.0805983105. Epub 2008 Oct 6.
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- 18838690 [ View in PubMed]
- Abstract
Cytochrome P450(BioI) (CYP107H1) from the biotin operon of Bacillus subtilis forms a seven-carbon diacid through a multistep oxidative cleavage of a fatty acid linked to acyl carrier protein (ACP). Crystal structures of P450(BioI) in complex with three different length fatty acyl-ACP (Escherichia coli) ligands show that P450(BioI) binds the fatty acid such as to force the carbon chain into a U-shape above the active site heme. This positions the C7 and C8 carbons for oxidation, with a large additional cavity extending beyond the heme to accommodate the methyl termini of fatty acids beyond the site of cleavage. The structures explain the experimentally observed lack of stereo- and regiospecificity in the hydroxylation and cleavage of free fatty acids. The P450(BioI)-ACP complexes represent the only structurally characterized P450-carrier protein complexes to date, which has allowed the generation of a model of the interaction of the vancomycin biosynthetic P450 OxyB with its proposed carrier protein bound substrate.