Abstract
Three new compounds named penicitor A, aculene E and penicitor B, as well as four known compounds, were isolated from the fermentation broth of Penicillium sp. SCS-KFD08 associated with a marine animal Sipunculus nudus from the Haikou bay of China. Their planar structures and absolute configurations were unambiguously elucidated by spectroscopic data, Mosher's method, CD spectrum analysis along with quantum ECD calculation. Among them, compounds 2-7 showed quorum sensing inhibitory activity against Chromobacterium violaceum CV026, and could significantly reduce violacein production in N-hexanoyl-l-homoserine lactone (C6-HSL) induced C. violaceum CV026 cultures at sub-inhibitory concentrations.
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