The producer and biological activities of SO-075R1, a new mutactimycin group antibiotic.

The producer of SO-075R1, a new anthracycline group antibiotic was identified as Nocardia brasiliensis. SO-075R1 was active against Gram-positive bacteria, but not active against Gram-negative bacteria or fungi. All tested Nocardia brasiliensis strains as well as the producer itself were resistant to SO-075R1, although four other pathogenic Nocardia, i.e. N. asteroides, N. nova, N. farcinica and N. otitidiscaviarum were sensitive.

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