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- W2020677946 abstract "Although methylenedioxyphenyl (MDP) compounds, such as myristicin, are useful in the management of insecticide-resistant insects, the molecular mechanisms for their action in mammals and insects have not been elucidated. In this study, GC-MS analyses of methanol extracts of foliage of wild parsnip (Pastinaca sativa) have identified myristicin as a substrate for CYP6AB3v2, an imperatorin-metabolizing cytochrome P450 monooxygenase from Depressaria pastinacella (parsnip webworm). In contrast with its strong inhibitory effects on many mammalian P450s, myristicin is effectively metabolized by CYP6AB3v2 (V(max) and K(m) of 97.9 pmol/min/pmol P450 and 17.9 microM, respectively) at a rate exceeding that recorded previously for imperatorin, the only other known substrate for this highly specialized enzyme. The myristicin metabolite of CYP6AB3v2 is 1-(3',4'-methylenedioxy-5'-methoxyphenyl)-2,3-epoxypropane. Molecular dockings have indicated that, unlike other epoxide metabolites of furanocoumarins, this epoxide metabolite is likely to remain in the CYP6AB3v2 catalytic site due to its low binding energy (-31.0 kcal/mol). Inhibition assays indicate that myristicin acts as a mixed inhibitor of this insect P450 and suggest that the epoxide metabolite may be an intermediate involved in the formation of P450-methylenedioxyphenyl complexes." @default.
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- W2020677946 date "2008-06-01" @default.
- W2020677946 modified "2023-10-14" @default.
- W2020677946 title "Metabolism of myristicin by Depressaria pastinacella CYP6AB3v2 and inhibition by its metabolite" @default.
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- W2020677946 doi "https://doi.org/10.1016/j.ibmb.2008.03.013" @default.
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