Summary
Two approaches may be used to study the function of cytochrome P-450 in insects: (a) an evaluation of the spectral and catalytic properties of the hemoprotein while associated with microsomal membranes; (b) the solubilization, resolution and purification of the microsomal mixed-function oxidase system. The first approach has provided some understanding of the biochemical factors involved in the metabolism of a variety of compounds, including pesticides, drugs, hormones and many other xenobiotics. However, solubilization of the monooxygenase system allows the study of each of its components individually, providing a better insight on the sequence of events leading to the hydroxylation of a substrate, the type of intermediates formed, and the rate-limiting step(s). This report discusses studies carried out with the monooxygenase system associated with microsomal membranes, as well as procedures to solubilize and partially purify its components from housefly microsomes. The latter involves solubilization with either Triton X-100 or sodium cholate, followed by either ammonium sulfate fractionation, Sephadex G-200, DEAE-Sephadex A-50 column chromatography or byω-amino-n-octyl-Sepharose 4B affinity chromatography. These procedures have shown that two cytochrome P-450 species (P-450 and P-450I) are present in microsomes isolated from a resistant housefly strain. Induction with either naphthalene or phenobarbital appears to increase cytochrome P-450I preferentially.
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Agosin, M. Insect cytochrome P-450. Mol Cell Biochem 12, 33–44 (1976). https://doi.org/10.1007/BF01731901
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DOI: https://doi.org/10.1007/BF01731901