OM-173,new nanaomycin-type antibiotics produced by a strain of streptomyces. Taxonomy,production,isolation and biological properties.

Abstract
Actinomycete strain OM-173, a new soil isolate, produced 5 nanaomycin-type antibiotics. Antibiotic OM-173 components .alpha.A, .alpha.E, .alpha.B, .beta.A and .beta.E were isolated from the fermentation broth of strain OM-173 by solvent extraction, silica gel chromatography and preparative TLC. The components were active against mycoplasmas and, to a lesser extent, against fungi. Strain OM-173 was identified as a strain of genus Streptomyces and differed apparently from Streptomyces rosa var. notoensis, the nanaomycin-producing strain, in cultural characteristics.