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Related Experiment Videos

Actinomycin biosynthesis by protoplasts derived from Streptomyces parvulus

M J Hitchcock, E Katz

    Antimicrobial Agents and Chemotherapy
    |January 1, 1978
    PubMed
    Summary

    Protoplasts from Streptomyces parvulus can synthesize actinomycin D, but their antibiotic production is sensitive to actinomycin D and sucrose levels. Mycelium showed higher sensitivity to amino acid analogs and greater amino acid uptake.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Molecular Biology

    Background:

    • Streptomyces parvulus is a key producer of the antibiotic actinomycin D.
    • Understanding the de novo synthesis of actinomycin D is crucial for optimizing antibiotic production.
    • Protoplasts offer a unique cellular system for studying microbial metabolism.

    Purpose of the Study:

    • To characterize actinomycin D de novo synthesis in Streptomyces parvulus protoplasts.
    • To compare the metabolic characteristics of protoplasts and mycelia in relation to antibiotic production.
    • To evaluate the utility of protoplasts for in vivo actinomycin synthesis studies.

    Main Methods:

    • Formation of Streptomyces parvulus protoplasts.
    • Cultivation of protoplasts and mycelia under varying conditions (actinomycin D, sucrose, amino acid analogs).
    • Measurement of actinomycin D synthesis and amino acid uptake.

    Main Results:

    • Protoplast-mediated actinomycin D synthesis was sensitive to actinomycin D and reduced sucrose concentrations.
    • Mycelial synthesis was more susceptible to inhibition by amino acid analogs.
    • Protoplasts exhibited significantly lower amino acid uptake compared to mycelia.

    Conclusions:

    • Streptomyces parvulus protoplasts can be used to study de novo actinomycin D synthesis.
    • Protoplast and mycelial metabolic pathways differ in their sensitivity to inhibitors and substrate availability.
    • Protoplasts present both advantages and limitations for investigating in vivo actinomycin synthesis.

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