IUBMB Enzyme Nomenclature


Accepted name: taxane 13α-hydroxylase

Reaction: taxa-4(20),11-dien-5α-ol + [reduced NADPH—hemoprotein reductase] + O2 = taxa-4(20),11-dien-5α,13α-diol + [oxidized NADPH—hemoprotein reductase] + H2O

For diagram of reaction click here.

Other name(s): CYP725A2 (gene name)

Systematic name: taxa-4(20),11-dien-5α-ol,[reduced NADPH—hemoprotein reductase]:oxygen oxidoreductase (13α-hydroxylating)

Comments: This cytochrome-P-450(heme-thiolate) enzyme from the plant Taxus cuspidata is involved in the biosynthesis of the diterpenoid antineoplastic drug taxol (paclitaxel).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Wheeler, A.L., Long, R.M., Ketchum, R.E., Rithner, C.D., Williams, R.M. and Croteau, R. Taxol biosynthesis: differential transformations of taxadien-5α-ol and its acetate ester by cytochrome P450 hydroxylases from Taxus suspension cells. Arch. Biochem. Biophys. 390 (2001) 265. [PMID: 11396929]

2. Jennewein, S., Rithner, C.D., Williams, R.M. and Croteau, R.B. Taxol biosynthesis: taxane 13 α-hydroxylase is a cytochrome P450-dependent monooxygenase. Proc. Natl. Acad. Sci. USA 98 (2001) 13595. [PMID: 11707604]

[EC created 2002 as EC, transferred 2018 to EC]

Return to EC 1.14.14 home page
Return to EC 1.14 home page
Return to EC 1 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page