Defluorination of 4-fluorophenol by cytochrome P450BM3-F87G: activation by long chain fatty aldehydes |
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Authors: | Alexandria Harkey Hye-Jin Kim Suneel Kandagatla Gregory M Raner |
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Institution: | The Department of Chemistry and Biochemistry, The University of North Carolina at Greensboro, 416 Sullivan Science Building, Greensboro, NC, 27402, USA. |
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Abstract: | Cytochrome P450(BM3)-F87G catalyzed the oxidative defluorination of 4-fluorophenol, followed by reduction of the resulting benzoquinone to hydroquinone via the NADPH P450-reductase activity of the enzyme. The k (cat) and K (m) for this reaction were 71?±?5?min(-1) and 9.5?±?1.3?mM, respectively. Co-incubation of the reaction mixture with long chain aldehydes stimulated the defluorination reaction, with the 2,3-unsaturated aldehyde, 2-decenal producing a 12-fold increase in catalytic efficiency. At 150?μM aldehyde, k (cat) increased to 158?±?4, while K (m) decreased to 1.8?±?0.2. The effects of catalase, glutathione and ascorbate on the reaction were all consistent with a direct oxygen insertion mechanism, as opposed to a radical mechanism. The study demonstrates the potential use of P450(BM3) mutants in oxidative defluorination reactions, and characterizes the novel stimulatory action of straight chain aldehydes on this activity. |
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