IUBMB Enzyme Nomenclature


Accepted name: ecdysone 20-monooxygenase

Reaction: ecdysone + reduced acceptor + O2 = 20-hydroxyecdysone + acceptor + H2O

Other name(s): α-ecdysone C-20 hydroxylase; ecdysone 20-hydroxylase

Systematic name: Ecdysone,hydrogen-donor:oxygen oxidoreductase (20-hydroxylating)

Comments: An enzyme from insect fat body or malpighian tubules involving a heme-thiolate protein (P-450). NADPH can act as ultimate hydrogen donor.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 55071-97-1


1. Johnson, P. and Rees, H.H. The mechanism of C-20 hydroxylation of α-ecdysone in the desert locust, Schistocerca gregaria. Biochem. J. 168 (1977) 513-520. [PMID: 606249]

2. Nigg, H.N., Svoboda, J.A., Thompson, M.J., Dutky, S.R., Kaplanis, J.N. and Robbins, W.E. Ecdysome 20-hydroxylase from the midgut of the tobacco hornworm (Manduca sexta L.). Experientia 32 (1976) 438-439. [PMID: 5286]

3. Smith, S.L., Bollenbacher, W.E., Cooper, D.Y., Schleyer, H., Wielgus, J.J. and Gilbert, L.I. Ecdysone 20-monooxygenase: characterization of an insect cytochrome p-450 dependent steroid hydroxylase. Mol. Cell. Endocrinol. 15 (1979) 111-133. [PMID: 488526]

[EC created 1978]

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