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- W2018997046 abstract "The dual localization of ecdysone 20-monooxygenase in mitochondria and microsomes of Manduca sexta larval midgut was investigated. Cosubstrate requirements and response to osmolarity of the microsomal ecdysone 20-monooxygenase system were found to be different from those previously reported for the mitochondrial enzyme system. The microsomal monooxygenase utilized NADPH and, less efficiently, NADH as cosubstrates. NADPH and NADH effects were neither additive nor synergistic. NADPH yielded identical activities in isotonic and hypotonic incubations. Mitochondria and microsomes showed no synergistic interaction for ecdysone 20-hydroxylation. After washing of the mitochondria, a large proportion of their ecdysone 20-monooxygenase activity was lost. The extent of the loss was inversely correlated to the concentration of mitochondria in the incubation mixture. The addition of bovine serum albumin to the incubations (2 mg/ml) largely restored the original activities. The microsomal contamination in mitochondrial pellets after each of three successive washings was determined by measuring the activity of a microsomal marker enzyme, NADPH-cytochrome c reductase. At each step of the purification, the ecdysone 20-monooxgenase activity of the mitochondrial preparations far exceeded the activity attributable to the microsomal contamination. These results confirm the existence of two independent ecdysone 20-monooxygenase systems in the midgut of M. sexta larvae." @default.
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- W2018997046 title "Ecdysone 20-monooxygenase in mitochondria and microsomes ofManduca sexta (L.) Midgut: Is the dual localization real?" @default.
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- W2018997046 doi "https://doi.org/10.1002/arch.940020406" @default.
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