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Related Experiment Videos

Microbial transformation of validamycins.

Y Kameda, S Horii, T Yamano

    The Journal of Antibiotics
    |April 1, 1975
    PubMed
    Summary

    Microbial hydrolysis selectively cleaves validamycin glucosidic linkages, converting less active validamycin C to highly active validamycin A. This process also enabled the semisynthesis of new validamycins using microbial transglycosidation.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Synthetic Chemistry

    Background:

    • Validamycins are a class of antibiotics with varying biological activity.
    • Selective cleavage of glucosidic linkages in validamycins is crucial for enhancing their efficacy.
    • Validamycin C is less potent than validamycin A, necessitating conversion.

    Purpose of the Study:

    • To investigate microbial hydrolysis for selective cleavage of alpha- or beta-glucosidic linkages in validamycins.
    • To achieve the conversion of validamycin C to the more active validamycin A.
    • To explore semisynthesis of novel validamycins via microbial transglycosidation.

    Main Methods:

    • Selective hydrolysis of alpha-glucoside linkage in validamycin C.
    • Microbial transglycosidation using validoxylamine A as a glycosyl acceptor for semisynthesis.
    • Incorporation studies using D-[U-14C]glucose and [14C]validoxylamine A with Streptomyces hygroscopicus var. limoneus.

    Main Results:

    • Selective hydrolysis successfully converted validamycin C to validamycin A.
    • Semisynthesis yielded new validamycins, including beta-D-galactosyl-validoxylamine A.
    • High incorporation of labeled glucose and validoxylamine A into validamycin A was observed.

    Conclusions:

    • Microbial hydrolysis offers a significant method for enhancing validamycin activity by converting validamycin C to A.
    • Microbial transglycosidation is effective for the semisynthesis of novel validamycin derivatives.
    • Streptomyces hygroscopicus var. limoneus efficiently produces validamycin A and can be utilized for biosynthesis studies.

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