- Source: Taxane 13alpha-hydroxylase
In enzymology, a taxane 13alpha-hydroxylase (EC 1.14.13.77) is an enzyme that catalyzes the chemical reaction
taxa-4(20),11-dien-5alpha-ol + NADPH + H+ + O2
⇌
{\displaystyle \rightleftharpoons }
taxa-4(20),11-dien-5alpha,13alpha-diol + NADP+ + H2O
The 4 substrates of this enzyme are taxa-4(20),11-dien-5alpha-ol, NADPH, H+, and O2, whereas its 3 products are taxa-4(20),11-dien-5alpha,13alpha-diol, NADP+, and H2O.
This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with NADH or NADPH as one donor, and incorporation of one atom o oxygen into the other donor. The systematic name of this enzyme class is taxa-4(20),11-dien-5alpha-ol,NADPH:oxygen oxidoreductase (13alpha-hydroxylating). This enzyme participates in diterpenoid biosynthesis.
References
Wheeler AL, Long RM, Ketchum RE, Rithner CD, Williams RM, Croteau R (2001). "Taxol biosynthesis: differential transformations of taxadien-5 alpha-ol and its acetate ester by cytochrome P450 hydroxylases from Taxus suspension cells". Arch. Biochem. Biophys. 390 (2): 265–78. doi:10.1006/abbi.2001.2377. PMID 11396929.
Jennewein S, Rithner CD, Williams RM, Croteau RB (2001). "Taxol biosynthesis: taxane 13 alpha-hydroxylase is a cytochrome P450-dependent monooxygenase". Proc. Natl. Acad. Sci. U.S.A. 98 (24): 13595–600. Bibcode:2001PNAS...9813595J. doi:10.1073/pnas.251539398. PMC 61086. PMID 11707604.
