Taxane 13alpha-hydroxylase

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. doi:10.1073/pnas.251539398. PMC 61086. PMID 11707604.

Oxidoreductases: dioxygenases, including steroid hydroxylases (EC 1.14)

1.14.11: 2-oxoglutarate	Prolyl hydroxylase Lysyl hydroxylase

1.14.13: NADH or NADPH	Flavin-containing monooxygenase FMO1 FMO2 FMO3 FMO4 FMO5 Nitric oxide synthase NOS1 NOS2 NOS3 Cholesterol 7 alpha-hydroxylase Methane monooxygenase 3A4 Lanosterol 14 alpha-demethylase 24-hydroxycholesterol 7α-hydroxylase

1.14.14: reduced flavin or flavoprotein	19A1 2D6 2E1

1.14.15: reduced iron-sulfur protein	11B1 11B2 11A1

1.14.16: reduced pteridine (BH4 dependent)	Phenylalanine hydroxylase Tyrosine hydroxylase Tryptophan hydroxylase

1.14.17: reduced ascorbate	Dopamine beta-hydroxylase

1.14.18-19: other	Tyrosinase Stearoyl-CoA desaturase-1

1.14.99 - miscellaneous	Cyclooxygenase Heme oxygenase (HMOX1) Squalene monooxygenase 17A1 21A2

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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