JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Production, isolation and biological activity of nargenicin from Nocardia sp. CS682.

Culture broth of an actinomycete isolate, Nocardia sp. CS682 showed specifically higher antibacterial activity against methicillin resistant Staphylococcus aureus (MRSA). Purified substance from the organism, CS-682, which is active against MRSA and Micrococcus leuteus, is a C(28)H(37)NO(8) (M+H(+), observed: 516.83) and identified as an unusual macrolide antibiotic, nargenicin. The chemical structure of CS-682 was identified by FT-IR, (1)H-NMR, (13)C-NMR, and ((1)H-(1)H and (1)H-(13)H) COSY. The anti-MRSA activity of CS-682 was stronger than that of oxacillin, vancomycin, monensin, erythromycin, and spiramycin. Phylogenetic analysis showed that strain CS682 is closely related to Nocardia tenerifensis DSM 44704(T) (98.7% sequence similarity), followed by N. brasiliensis ATCC 19296(T) (98.4% sequence similarity). The ability of Nocardia sp. CS682 to produce nargenicin was unique.

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