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- W2022768058 abstract "A dual-affinity method was established to purify, for the first time, a microsomal ecdysone-binding cytochrome P450 protein from locust Malpighian tubules. This method involved, after prepurification on omega-octylamino-agarose and hydroxylapatite, binding of cytochrome P450 to an immobilized triazole-based general P450 inhibitor (type-II ligand) followed by elution with the substrate ecdysone (type-I ligand) of the bound cytochrome. The isolated material showed a typical cytochrome P450 spectrum, a specific heme content of 13 nmol/mg protein, and a prominent protein of about 60 kDa on SDS-PAGE. Based on a tryptic undecapeptide sequence the isolated protein may be identical to CYP6H1, a putative ecdysone 20-monooxygenase recently cloned from the same tissue. Ecdysone 20-monooxygenase activity could be partially reconstituted from microsomal detergent extracts, when supplemented with purified bovine cytochrome P450 reductase and detergent-extracted microsomes; reconstitution was not successful with any chromatographic fraction, however. Therefore, purification of the locust cytochrome P450 was monitored by ecdysone-induced type-I difference spectra, whenever applicable, in addition to carbon monoxide spectra. Affinity columns with matrix-bound diethylstilbestrol and testosterone 3-thiosemicarbazone, but not with the 17beta-hemisuccinate, yielded elution profiles with ecdysone that were comparable to those of the triazole matrix. The concept of dual-affinity chromatography described here may be generally applicable to the isolation of cytochromes P450." @default.
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- W2022768058 date "2001-01-13" @default.
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- W2022768058 title "A Microsomal Ecdysone-Binding Cytochrome P450 from the Insect Locusta migratoria Purified by Sequential Use of Type-II and Type-I Ligands" @default.
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- W2022768058 doi "https://doi.org/10.1515/bc.2001.188" @default.
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