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Related Experiment Video

Updated: Apr 15, 2026

Screening and Isolation of C-Glycoside-Cleaving Intestinal Bacteria
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Published on: February 28, 2025

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[Screening and optimization of cholesterol conversion strain].

Dan Fan, Bingjian Xiong, Cuiping Pang

    Wei Sheng Wu Xue Bao = Acta Microbiologica Sinica
    |March 26, 2015
    PubMed
    Summary

    A novel bacterial strain, SE-1, was isolated and identified as closely related to Burkholderia cepacia. This strain effectively transforms cholesterol into 7beta-hydroxycholesterol and 7-oxocholesterol under optimized fermentation conditions.

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    Area of Science:

    • Microbiology
    • Biotechnology
    • Biochemistry

    Background:

    • Cholesterol biotransformation is a key process in microbial metabolism.
    • Isolation and characterization of novel microorganisms capable of specific biotransformations are crucial for biotechnological applications.
    • Burkholderia species are known for their metabolic versatility.

    Purpose of the Study:

    • To isolate and characterize a soil bacterium capable of cholesterol transformation.
    • To identify the cholesterol transformation products.
    • To optimize fermentation conditions for enhanced cholesterol conversion.

    Main Methods:

    • Isolation of strain SE-1 using cholesterol as the sole carbon source.
    • Phylogenetic analysis based on 16S rRNA gene sequencing.
    • Identification of transformation products using Thin Layer Chromatography, Sephadex LH20, 1H-NMR, and 13C-NMR.
    • Optimization of fermentation parameters including medium composition, inoculation, pH, and temperature.

    Main Results:

    • Strain SE-1, identified as closely related to Burkholderia cepacia (99% 16S rRNA gene similarity), was isolated.
    • Cholesterol was transformed into 7beta-hydroxycholesterol and 7-oxocholesterol.
    • Optimized conditions (5% molasses, 0.3% (NH4)2SO4, 4% inoculation, pH 7.5, 36°C) yielded a 34.4% conversion rate at 1 g/L cholesterol concentration.
    • Cholesterol 7beta-hydroxylation conversion rate improved by 20.8% under optimal conditions.

    Conclusions:

    • Soil bacterium SE-1 effectively transforms cholesterol.
    • The identified strain is a promising candidate for lab-scale cholesterol bioconversion.