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Lactoquinomycin B, a novel antibiotic.

T Okabe, K Nomoto, N Tanaka

    The Journal of Antibiotics
    |January 1, 1986
    PubMed
    Summary

    Streptomyces tanashiensis IM8442T produces novel antibiotic lactoquinomycin B, a derivative of lactoquinomycin A. This compound exhibits antibacterial and anticancer properties, showing potential for therapeutic applications.

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    Area of Science:

    • Microbiology
    • Natural Product Chemistry
    • Pharmacology

    Background:

    • Streptomyces tanashiensis is a known source of bioactive compounds.
    • Lactoquinomycin A is a previously identified antibiotic from this species.
    • The discovery of novel antibiotics is crucial for combating antimicrobial resistance.

    Purpose of the Study:

    • To isolate and characterize a novel antibiotic, lactoquinomycin B, produced by Streptomyces tanashiensis IM8442T.
    • To elucidate the chemical structure of lactoquinomycin B.
    • To evaluate the biological activities of lactoquinomycin B.

    Main Methods:

    • Fermentation of Streptomyces tanashiensis IM8442T.
    • Purification of lactoquinomycin B using chromatographic techniques.
    • Physicochemical characterization (MP, MS, UV, IR).
    • Structural elucidation using Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 13C).
    • Biological activity assays (antibacterial and cytotoxic).

    Main Results:

    • Lactoquinomycin B was isolated and purified.
    • Its chemical formula is C24H27NO9, with a melting point of 149-152 °C.
    • Structural analysis revealed lactoquinomycin B as a 4a,10a-epoxide derivative of lactoquinomycin A.
    • Lactoquinomycin B demonstrated inhibitory activity against bacteria, especially Gram-positive strains.
    • The compound exhibited cytotoxicity against human and murine tumor cell lines.
    • The median lethal dose (LD50) in mice was approximately 40 mg/kg via intravenous administration.

    Conclusions:

    • Lactoquinomycin B is a novel antibiotic with a unique epoxide structure.
    • It possesses significant antibacterial and anticancer potential.
    • Further research into lactoquinomycin B could lead to new therapeutic agents.

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