Rapid Screening and Isolation of a Fungus for Sitosterol to Androstenedione Biotransformation |
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Authors: | Alok Malaviya James Gomes |
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Institution: | (1) Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India |
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Abstract: | Androstenedione (AD) is a steroid intermediate used in the pharmaceutical industry for the production of several important
anabolic drugs. An important route for producing AD is by the microbial transformation of sterols. Microbes capable of efficiently
transforming sterols to AD are few and newer strains need to be isolated. Conventional procedures for screening and isolation
are time consuming. A new procedure was used for screening and isolation of fungal microorganisms capable of biotransformation
of sitosterol to androstenedione. In this procedure, Basic Alignment Search Tool (BLAST) and Position-Specific Iterative BLAST
were employed to obtain a parent set of candidate microorganisms. The parent set was reduced using heuristics and constraints
to obtain a manageable number of microorganisms that may be tested experimentally. For this work, screening of the entire
NCBI database yielded a parent set containing 64 microorganisms. Among these, only two microorganisms, Aspergillus oryzae and Aspergillus nidulans FGSC A4, qualified to the experimental stage. Sitosterol biotransformation experiments were carried out using A. oryzae and the production of AD in culture medium was confirmed. |
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Keywords: | Androstenedione Biotransformation BLAST β -Sitosterol Isolation Screening |
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