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United States Department of Agriculture

Agricultural Research Service

Title: Kipukasins: Nucleoside derivatives from Aspergillus versicolor.

item Jiao, Ping
item Mudur, Sanjay
item Gloer, James
item Wicklow, Donald

Submitted to: Journal of Natural Products
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/7/2007
Publication Date: 7/3/2007
Citation: Jiao, P., Mudur, S., Gloer, J., Wicklow, D.T. 2008. Kipukasins: nucleoside derivatives from Aspergillus versicolor. Journal of Natural Products. 70(8):1308-1311. Available:

Interpretive Summary: Fungi that parasitize and kill other fungi offer a potential source of novel bioactive agents useful to agriculture and medicine. The fungus Aspergillus versicolor, isolated from a wood decay fungus found growing on a tree in a montane forest in Hawaii County, Hawaii, was examined for its ability to produce bioactive metabolites. Kipukasins A and B are reported as new fungal metabolites showing modest activity against gram-positive bacteria.

Technical Abstract: Seven new aroyl uridine derivatives (kipukasins A-G; 1-7) were isolated from solid-substrate fermentation cultures of two different Hawaiian isolates of Aspergillus versicolor. The structures of compounds 1-7 were determined by analysis of NMR and MS data. The nucleoside portion of lead compound 1 was assigned as uracil-1-B-D-ribofuranoside by spectral comparison with an authentic standard. The bioactivity of the original A. versicolor extracts was accounted for mainly by the presence of the known metabolite sterigmatocystin, but kipukasins A and B showed modest activity in assays against gram-positive bacteria.

Last Modified: 10/16/2017
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