Sortase A-Inhibitory Metabolites from a Marine-Derived Fungus Aspergillus sp.
2020
Sung Chul Park | Beomkoo Chung | Jayho Lee | Eunji Cho | Ji-Yeon Hwang | Dong-Chan Oh | Jongheon Shin | Ki-Bong Oh
Seven alkaloidal compounds (2&ndash:8) and one polyketide (1) were isolated from a semisolid rice culture of the marine-derived fungus Aspergillus sp. F452. Structures of the isolated compounds were elucidated based on spectroscopic data and comparisons with previously reported data. The alkaloidal compounds (2&ndash:8) displayed weak to moderate inhibitory activities against Staphylococcus aureus-derived sortase A (SrtA) without affecting cell viability. Aspermytin A (1) strongly inhibited SrtA activity, with an IC50 value of 146.0 &mu:M, and significantly reduced bacterial adherence to fibronectin-coated surfaces. The present results indicate that the underlying mechanism of action of compound 1 is associated with the inhibition of SrtA-mediated S. aureus adhesion to fibronectin, thus potentially serving as an SrtA inhibitor.
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