Aquastatin A, a New Inhibitor of Enoyl-Acyl Carrier Protein Reductase from Sporothrix sp. FN611

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  • Kwon Yun-Ju
    Korea Research Institute of Bioscience and Biotechnology
  • Fang Yi
    Korea Research Institute of Bioscience and Biotechnology
  • Xu Guang-Hua
    Korea Research Institute of Bioscience and Biotechnology
  • Kim Won-Gon
    Korea Research Institute of Bioscience and Biotechnology

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Bacterial enoyl-acyl carrier protein (ACP) reductase has been confirmed as a novel target for antibacterial drug development. In this study, we determined that a fungal metabolite from Sporothrix sp. FN611 potently inhibited the enoyl-ACP reductase (FabI) of Staphylococcus aureus. Its structure identified the metabolite as aquastatin A by the MS and NMR data. Aquastatin A inhibited S. aureus FabI with an IC50 of 3.2 μM. It also prevented the growth of S. aureus and methicillin-resistant Staphylococcus aureus (MRSA) with minimum inhibitory concentration of 16—32μg/ml. Aquastatin A also exerted an inhibitory effect against the FabK isoform, an enoyl-ACP reductase of Streptococcus pneumoniae, with an IC50 of 9.2 μM. The degalactosylation of aquastatin A did not affect the FabI and FabK-inhibitory or antibacterial activities, thereby suggesting that the sugar moiety within its molecular structure was not involved in these activities. The inhibitory effects of aquastatin A and its degalactosylated derivative on enoyl-ACP reductases and bacterial viability are reported for the first time in this study; these effects point to the potential that aquastatin A may be developed into a new broad-spectrum antibacterial and anti-MRSA agent.

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