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Polyketides from the Deep-Sea-Derived Fungus Graphostroma sp. MCCC 3A00421 Showed Potent Antifood Allergic Activities.
Journal of Agricultural and Food Chemistry 2018 Februrary 15
To discover antifood allergic components from deep-sea-derived microorganisms, we performed a systematic chemical investigation of the Atlantic hydrothermal fungus Graphostroma sp. MCCC 3A00421. Consequently, nine new (1-9) and 19 known (10-28) polyketides were isolated. The planar structures of the new compounds were elucidated mainly by detailed analysis of their nuclear magnetic resonance and high-resolution electrospray ionization mass spectrometry data, while the absolute configurations were established using the modified Mosher's method in association with electronic circular dichroism spectra. Graphostrin A (1) is a novel chlorinated polyketide derivate bearing an oxazole moiety. All isolates were tested for antifood allergic bioactivities in immunoglobulin E-mediated rat basophilic leukemia-2H3 cells. Reticulol (10) significantly decreased the rates of degranulation and histamine release with IC50 values of 13.5 and 13.7 μM, respectively, suggesting reticulol could be a potential antifood allergic medicine.
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