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Taxonomic studies on a Streptomyces strain producing labilomycin

Taxonomic studies on a Streptomyces strain producing labilomycin

Jour Antibiot [tokyo] Ser A 16(4): 152-154

A Streptomyces strain producing labilomycin forms white colored aerial hyphae and does not form any true spirals or whorls. The spore surface is smooth. Substrate growth showed reddish or pinkish orange, brownish orange color. Melanin pigment was not produced on protein media (non-chromogenic). It showed weak proteolytic action and positive hydrolysis of starch. The strain is closely related to Actinomyces oidiosporus (Streptomyces oidiosporus) and to Streptomyces albosporeus, both of which are related to Streptomyces ruber (Actinomyces ruber). A. oidiosporus was similar to the strain No. A955-Y3, but A. oidiosporus formed rose colored aerial mycelium without spiral formation and its spores were formed by segmentation and frequently showed a diplococcus appearance. Dipolar granules were described in segmented spores. A. oidiosporus 63X sporulated poorly on various media and only produced thin white aerial hyphae on Hickey's agar and potato agar. Diplococcus-like bodies and bipolar granules could not be observed in its spores either by photo-microscopy or by electron microscopy. An electromicroscopic study of the strain No. A955-Y3 revealed electron dense granules in the segmented spores, but they were not bipolar and were not observed in usual spore-bearing hyphae. Therefore the strain No. A955-Y3 should not be classified as A. oidiosporus, because of the morphology of their aerial hyphae and spores. When the strain No. A955-Y3 was compared with S. albosporeus, there were no great differences except fair production of nitrite. The culture labelled ATCC 3003 did not form reddish growth and produced somewhat grayish white aerial mycelium. But the culture showed straight aerial hyphae without spirals or whorls, and its spores are smooth suggesting similarities with the strain No. A955-Y3. S. albosporeus or a streptomycete which resembles it produces an antibiotic, vinacetin. But an antibiotic produced by the strain No. A955-Y3 is different from vinacetin. The strain No. A955-63 is closely related to S. albosporeus but produced a different antibiotic. The name S. albosporeus var. labiolomyceticus is proposed.

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Accession: 025639450

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PMID: 14044927

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