Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 71, Issue 9, Pages 5275-5281Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.71.9.5275-5281.2005
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Comamonas testosteroni TA441 utilizes testosterone via aromatization of the A ring followed by meta-cleavage of the ring. The product of the meta-cleavage reaction, 4,5-9,10-diseco-3-hydroxy-5,9,17-trioxoandrosta-1(10),2-dien-4-oic acid, is degraded by a hydrolase, TesD. We directly isolated and identified two products of TesD as 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid and (2Z,4Z)-2-hydroxyhexa-2,4-dienoic acid. The latter was a pure 4Z isomer. 2-Hydroxyhexa-2,4-dienoic acid was converted by a hydratase, TesE, and the product isolated from the reaction solution was identified as 2-hydroxy-4-hex-2-enolactone, indicating the direct product of TesE to be 4-hydroxy-2-oxohexanoic acid.
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