IUBMB Enzyme Nomenclature


Accepted name: C-19 steroid 1α-hydroxylase

Reaction: testosterone + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 1α-hydroxytestosterone + H2O + 2 oxidized ferredoxin [iron-sulfur] cluster

Other name(s): CYP260A1

Systematic name: testosterone,reduced-ferredoxin:oxygen oxidoreductase (1α-hydroxylating)

Comments: The enzyme, characterized from the bacterium Sorangium cellulosum, is a class I cytochrome P-450, and uses ferredoxin as its electron donor [1]. It was shown to act on several C-19 steroid substrates, including testosterone, androstenedione, testosterone-acetate and 11-oxoandrostenedione [2].

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


1. Ewen, K.M., Hannemann, F., Khatri, Y., Perlova, O., Kappl, R., Krug, D., Huttermann, J., Muller, R. and Bernhardt, R. Genome mining in Sorangium cellulosum So ce56: identification and characterization of the homologous electron transfer proteins of a myxobacterial cytochrome P450. J. Biol. Chem. 284 (2009) 28590-28598. [PMID: 19696019]

2. Khatri, Y., Ringle, M., Lisurek, M., von Kries, J.P., Zapp, J. and Bernhardt, R. Substrate hunting for the myxobacterial CYP260A1 revealed new 1α-hydroxylated products from C-19 steroids. Chembiochem 17 (2016) 90-101. [PMID: 26478560]

[EC created 2016]

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