期刊
ORGANIC & BIOMOLECULAR CHEMISTRY
卷 15, 期 48, 页码 10276-10280出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ob02707a
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资金
- National Natural Science Foundation of China [21472251, 41376149, 41276146]
- Key Project of Natural Science Foundation of Guangdong Province [2016A040403091]
- Natural Science Foundation of Guangdong Province [2017A030313088]
- Fundamental Research Funds for the Central Universities [14lgjc16]
A pair of novel enantiomeric polyketide dimers, (+)- and (-)-ascomlactone A (1a and 1b), were obtained from a mangrove endophytic fungus Ascomycota sp. SK2YWS-L. The structures were elucidated based on spectroscopic methods, and the absolute configurations were determined by X-ray diffraction and electronic circular dichroism (ECD) calculations. Ascomlactone A possessed an unprecedented polymerization system, which constructed an unusual nine-membered lactone ring between the monomers. A possible biogenetic pathway was proposed. Both 1a and 1b exhibited significant inhibitory effects against alpha-glucosidase with IC50 values of 63.7 and 27.9 mu M, respectively. A further docking study provided an inside perspective of the action in alpha-glucosidase.
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