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. 2020 Jan 19;18(1):67.
doi: 10.3390/md18010067.

Altertoxins with Quorum Sensing Inhibitory Activities from The Marine-Derived Fungus Cladosporium sp. KFD33

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Free PMC article

Altertoxins with Quorum Sensing Inhibitory Activities from The Marine-Derived Fungus Cladosporium sp. KFD33

Fei Zhang et al. Mar Drugs. .
Free PMC article

Abstract

Five new perylenequinone derivatives, altertoxins VIII-XII (1-5), as well as one known compound cladosporol I (6), were isolated from the fermentation broth of the marine-derived fungus Cladosporium sp. KFD33 from a blood cockle from Haikou Bay, China. Their structures were determined based on spectroscopic methods and ECD spectra analysis along with quantum ECD calculations. Compounds 1-6 exhibited quorum sensing inhibitory activities against Chromobacterium violaceum CV026 with MIC values of 30, 30, 20, 30, 20 and 30 μg/well, respectively.

Keywords: Cladosporium sp.; altertoxins; quorum sensing inhibitory activity.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The chemical structures of compounds 16.
Figure 2
Figure 2
Key COSY and HMBC correlations of compounds 15.
Figure 3
Figure 3
Experimental ECD spectra for compounds 16 and calculated ECD spectra for (R)-2 and (S)-2.

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