Synthesis of 9 alpha-hydroxysteroids by a Rhodococcus sp

Area of Science:

• Microbiology
• Biotechnology
• Steroid Chemistry

Background:

• Steroid modifications are crucial in pharmaceutical and chemical industries.
• Microbial biotransformation offers a sustainable route for specific steroid modifications.
• Hydroxylation at the 9 alpha position is a challenging but valuable chemical transformation.

Purpose of the Study:

• To isolate and identify microorganisms capable of 9 alpha-hydroxylation of steroids.
• To optimize conditions for microbial 9 alpha-hydroxylation of various steroid classes.
• To investigate the structure-activity relationship in microbial steroid transformation.

Main Methods:

• Isolation of Rhodococcus sp. from petroleum-contaminated soil.
• Cultivation of Rhodococcus sp. and incubation with diverse delta 5-3 beta-hydroxysteroids.
• Analysis of steroid transformation products using chromatographic and spectroscopic techniques.

Main Results:

• A Rhodococcus sp. effectively performed 9 alpha-hydroxylation on androstane, pregnane, and norcholane steroids.
• Transformed steroids were predominantly 9 alpha-hydroxy-delta 4-3-ketones, with yields ranging from 50-90%.
• High substrate concentrations (0.5-5.0 g/L) were tolerated, indicating robustness of the microbial process.

Conclusions:

• Rhodococcus sp. is a potent biocatalyst for 9 alpha-hydroxylation of steroids.
• The microbial process is efficient and scalable for producing valuable steroid derivatives.
• Steroid structure significantly influences the efficiency and outcome of the biotransformation.