Abstract
A newly isolated actinomycete, Gordonia neofelifaecis (NRRL B-59395) from the faeces of Neofelis nebulosa, was used to selectively degrade the side-chain of cholesterol. The intermediates were purified and characterized. Quantitative analysis of the accumulated metabolites from cholesterol side-chain cleavage was conducted during the biotransformation. The results showed that the profile of accumulated intermediates was different from those of other reported microorganisms. Among the five metabolites, androsta-1,4-diene-3,17-dione (ADD) was the main product of the side-chain degradation, with a high conversion rate (87.2%), indicating its potential for industrial production of ADD. At the end of transformation, the substrate cholesterol was completely consumed. The effect of some factors on the bioconversion was also investigated. To our best knowledge, this is the first report regarding cholesterol side-chain cleavage using bacteria belonging to Gordonia.
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