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The bioxalomycins, a novel complex of broad-spectrum antibiotics, were isolated from fermentations of Streptomyces viridodiastaticus subsp. "litoralis" LL-31F508. Bioxalomycin alpha 2, the major component of this complex, exhibited antibacterial activity. The MICs ranged from &lt; or = 0.002 to 0.008 micrograms/ml for gram-positive organisms and from 0.50 to 4 micrograms/ml for gram-negative organisms. Bioxalomycin alpha 2 was found to be bactericidal and to inhibit bacterial DNA synthesis preferentially. Bioxalomycin alpha 2 protected mice from a lethal challenge with Staphylococcus aureus Smith. The 50% effective dose of bioxalomycin alpha 2 administered orally was 10 times greater than that when the drug was given subcutaneously or intravenously. These data suggest a stability or bioavailability problem when the compound is administered orally.

antimicrobial agents and chemotherapy

Mechanistic studies and biological activity of bioxalomycin alpha 2, a novel antibiotic produced by Streptomyces viridodiastaticus subsp. "litoralis" LL-31F508