Phytochemistry p. 927 - 933 (1996)
Update date:2022-08-11
Topics:
Grebenok, Robert J.
Galbraith, David W.
Benveniste, Irene
Feyereisen, Rene
A microsomal preparation isolated from first leaves of 25-day-old spinach catalysed the hydroxylation of ecdysone to produce the insect moulting hormone, 20-hydroxyecdysone. Hydroxylation was dependent on NADPH and molecular oxygen, and was inhibited by carbon monoxide. Carbon monoxide inhibition was partially reversible by white light. Polyclonal antibodies to the Jerusalem artichoke NADPH-cytochrome P450 reductase inhibited the hydroxylation reaction as well as the spinach microsomal NADPH cytochrome c reductase. These results taken together establish ecdysone hydroxylation as a cytochrome P450 dependent reaction in spinach, which is known to synthesize large amounts of phytoecdysteroids.
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