抄録
Although the name Streptomyces kasugaensis has already been used for a kasugamycin producer strain MB273-C4 that is approved as a Streptomyces host in the Japanese guideline for recombinant DNA experiments, the name has not been authorized taxonomically. We examined two kasugamycin producers, strains M338-M1 and MB273-C4, for their taxonomic properties including not only morphology and physiology, but also structures of some cell components and DNA. The results indicated that the two strains should belong together to a new species of the genus Streptomyces. We officially propose the name Streptomyces kasugaensis, the type strain being strain M338-M1 (= ATCC 15714). This new species was characterized by spiral spore chains, smooth spore surfaces, gray aerial mass, yellow to brownish soluble pigments, LL-diaminopimelic acid in cell walls, type PII phospholipids, a lack of mycolic acids, MK-9(H6,H8,H4) menaquinones, fatty acid components of ai-15:0,16:0, ai-17:0 and i-16:0, and a G+C content of 70.4 to 70.9 mol%.
