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Pentacyclic Antibiotics from a Tidal Mud Flat-Derived Actinomycete
Cited 19 time in
Web of Science
Cited 20 time in Scopus
- Authors
- Issue Date
- 2015-03
- Publisher
- American Chemical Society
- Citation
- Journal of Natural Products, Vol.78 No.3, pp.524-529
- Abstract
- The combination of investigating a unique source of chemically prolific bacterium with an LC/MS-based bacterial strain selection approach resulted in the discovery of two new secondary metabolites, buanmycin (1) and buanquinone (2), from the culture of a marine Streptomyces strain, which was isolated from a tidal mudflat in Buan, Republic of Korea. The carbon backbone of buanmycin (1), comprising 20 quaternary carbons out of 30 total carbons, was determined via C-13-C-13 COSY NMR analysis after labeling 1 with C-13 by culturing the bacterium with C-13-glucose. The complete structure of 1 was confidently elucidated, primarily based on 1D and 2D NMR spectroscopic and X-ray crystallographic analysis, as that of a new pentacyclic xanthone. The absolute configuration of the a-methyl serine unit in 1 was established by applying the advanced Marfey's method. The structure of buanquinone (2) was determined to be a new pentacyclic quinone based on NMR and MS spectroscopic data. Buanmycin exhibited potent cytotoxicity against colorectal carcinoma cells (HCT-116) and gastric carcinoma cells (SNU-638) with submicromolar IC50 values and strongly inhibited the pathogenic Gram-negative bacterium Salmonella enterica (MIC = 0.7 mu M). In particular, buanmycin demonstrated inhibition of sortase A, which is a promising target for antibiotic discovery.
- ISSN
- 0163-3864
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