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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Mode of action of epoxyphomalins a and b and characterization of related metabolites from the marine-derived fungus Paraconiothyrium sp.
Journal of Natural Products, Volume 73, No. 12, Year 2010
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Description
Epoxyphomalins A (1) and B (2) are highly potent cytotoxic fungal metabolites. During the course of purifying larger quantities of 1 and 2 from Paraconiothyrium sp. fermentation extracts, three new epoxyphomalins (3-5) were isolated and characterized, showing modifications to the oxidation pattern of the cyclohexene moiety or of C-9 of the decalin system. IC50 values for cytotoxicity against a panel of 36 human tumor cell lines were determined for all new compounds. Compound 4 was found to be cytotoxic particularly toward prostate PC3M (IC50 = 0.72 μM) and bladder BXF 1218 L (IC 50 = 1.43 μM) cancer cell lines. In addition, inhibition of chymotrypsin-, caspase-, and trypsin-like activity of purified 20S proteasomes was determined for epoxyphomalins A (1) and B (2). The results indicate that compounds 1 and 2 exert their cytotoxic effect through potent inhibition of the 20S proteasome. © 2010 The American Chemical Society and American Society of Pharmacognosy.
Authors & Co-Authors
Mohamed, Ietidal Eltahir
Sudan, Khartoum
Khartoum University
Kehraus, Stefan
Germany, Bonn
Universität Bonn
Krick, Anja
Germany, Bonn
Universität Bonn
König, Gabriele Maria
Germany, Bonn
Universität Bonn
Kelter, Gerhard
United States, Wilmington
Charles River Laboratories, Inc.
Maier, Armin
United States, Wilmington
Charles River Laboratories, Inc.
Fiebig, Heinz Herbert
United States, Wilmington
Charles River Laboratories, Inc.
Kalesse, Markus
Germany, Hannover
Gottfried Wilhelm Leibniz Universität Hannover
Germany, Braunschweig
Helmholtz Centre for Infection Research Hzi
Malek, Nisar Peter
Germany, Hannover
Hannover Medical School
Gross, Harald
Germany, Bonn
Universität Bonn
Statistics
Citations: 56
Authors: 10
Affiliations: 6
Identifiers
Doi:
10.1021/np100310k
ISSN:
01633864
e-ISSN:
15206025
Research Areas
Cancer