Correlation between the Presence of kac, Kasugamycin Acetyltransferase Gene, and the Productivity of Kasugamycin in Streptomyces.
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The <I>kac</I> gene coding for KSM acetyltransferase cloned from kasugamycin (KSM)-producing <I>Streptomyces kasugaensis</I> MB273-C4 (Hirasawa <I>et al.</I>, 1993 ; JP. A-05-23187) was investigated for its correlation with KSM-productivity. Genomic Southern hybridization analysis indicated that <I>kac</I> existed in the genome of all the KSM-producing <I>Streptomyces</I> strains tested, <I>i.e.</I>, <I>S. kasugaensis</I> MB273-C4 and M338-M1, and <I>S. celluloflavus</I> JCM4126 as well as <I>Streptomyces</I> sp. MF861-C4 that has characteristics taxonomically and phylogenically remote from those of the formers. We also found in experiments using <I>Streptomyces</I> sp. MF861-C4 that <I>kac</I> gene was readily deleted during storage as a lyophile with skim milk at 10°C or as a frozen 20% sucrose suspension at −20°C of its aerial mycelia, accompanying the loss of KSM productivity.
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