alexa ORF18-disrupted mutant of Comamonas testosteroni TA441 accumulates significant amounts of 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid and its derivatives after incubation with steroids.
Environmental Sciences

Environmental Sciences

Journal of Bioremediation & Biodegradation

Author(s): Horinouchi M, Hayashi T, Koshino H, Kudo T

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Abstract In a steroid degradation gene cluster of Comamonas testosteroni TA441 consisting of ORF18, 17 and tesIHA2A1DEFG, ORF18 was implicated in encoding a CoA-transferase by database searches, but the matching substrate was not clear. In this study, ORF18 was shown to be necessary for conversion of 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid, a product of hydrolysis of 4,5-9,10-diseco-3-hydroxy-5,9,17-trioxoandrosta-1(10),2-dien-4-oic acid in steroid degradation by TA441. The ORF18-disrupted mutant accumulates 7-hydroxy-9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid and 7,12-dihydroxy-9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid when incubated with chenodeoxycholic acid and cholic acid, respectively. This article was published in J Steroid Biochem Mol Biol and referenced in Journal of Bioremediation & Biodegradation

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