Steroid C26-monooxygenase

UniProtKB accession:  P9WPL5

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UniProtKB description:  Involved in the utilization of cholesterol as the sole carbon and energy source by degrading the side chain during infection (PubMed:20843794). Primarily catalyzes the sequential oxidation of the terminal methyl of cholest-4-en-3-one into (25R)-26-hydroxycholest-4-en-3-one (alcohol), (25R)-26-oxocholest-4-en-3-one (aldehyde), to finally yield the carboxylic acid (25R)-3-oxocholest-4-en-26-oate (PubMed:20843794, PubMed:20889498). In vitro, Cyp142 catalyzes with equal preference the oxidation of both (25R)- and (25S)-26-hydroxycholest-4-en-3-one diastereomers to the corresponding carboxylic acid which is a prerequisite for entry into the beta-oxidation pathway (PubMed:20843794). Also able to sequentially oxidize cholesterol itself, not only cholest-4-en-3-one (PubMed:20843794).