The structure of the cytochrome p450BM-3 haem domain complexed with the fatty acid substrate, palmitoleic acid.
The substrate-bound structures of two cytochrome P450s, P450cam and P450eryF, are known. While these structures reveal important features that control substrate specificity, the problem of how conformational changes allow for substrate entry and product release remains unsolved. The structure of the haem domain of the bacterial fatty acid hydroxylase, P450BM-3, previously was solved in the substrate-free form. Unlike the substrate-bound P450cam and P450eryF structures, the substrate access channel is open in substrate-free P450BM-3. Here we present the X-ray structure of P450BM-3 at 2.7 A bound with a fatty acid substrate, palmitoleic acid. A comparison of the substrate-bound and -free forms reveals major conformational differences and provides the first detailed picture of substrate-induced conformational changes in a P450.
Li
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Department of Molecular Biology and Biochemistry, University of California at Irvine 92697, USA.
Poulos
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D000595:Amino Acid Sequence; D001419:Bacteria / Q000201:enzymology; D001426:Bacterial Proteins; D001665:Binding Sites; D003460:Crystallization; D018360:Crystallography, X-Ray; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000378:metabolism*; D005229:Fatty Acids, Monounsaturated / Q000378:metabolism*; D006418:Heme / Q000737:chemistry / Q000378:metabolism; D006899:Mixed Function Oxygenases / Q000737:chemistry* / Q000378:metabolism*; D008958:Models, Molecular; D009251:NADPH-Ferrihemoprotein Reductase; D011487:Protein Conformation; D017433:Protein Structure, Secondary
D001426:Bacterial Proteins; D005229:Fatty Acids, Monounsaturated; C008757:palmitoleic acid; D006418:Heme; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases