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New Research Uncovers Elusive Target of Antifungal Agent
Date:6/13/2010

A research team in Japan has uncovered the mechanism underlying the antifungal activity of theonellamide (TNM), a bioactive compound found in a species of marine sponge. The finding, reported in Nature Chemical Biology, provides new insights toward the development of antifungal drugs, with broader applications to drug analysis in areas such as cancer research.

(PRWeb UK) June 13, 2010 -- A research team in Japan has uncovered the mechanism underlying the antifungal activity of theonellamide (TNM), a bioactive compound found in a species of marine sponge. The finding, reported in Nature Chemical Biology, provides new insights toward the development of antifungal drugs, with broader applications to drug analysis in areas such as cancer research.

Designing drugs that target fungal cells poses serious challenges due to their similarity to human cells at the molecular level. To avoid damaging human cells, such drugs exploit differences between mammalian and fungal cells, both of which, unlike bacteria, are in the same family of eukaryotes. The difficulty of this task results in toxic side effects and a shortage of effective antifungal agents.

The research team, headed by scientists at the RIKEN Advanced Science Institute, set out to tackle this problem by investigating the antifungal activity of theonellamides (TNMs), bicyclic peptides found in the marine sponge Theonella, on the fission yeast. Combining chemical-genetic profiling and biochemical and cellular analysis, they deduced that TNMs bind to a class of lipid molecules (3?-hydroxysterols) in the cell membrane to induce overproduction of 1,3-?-D-glucan, a component of the cell wall.

Antifungal activity in TNMs, the researchers showed, is thus different from other antifungals, which cause damage by impairing wall synthesis. Instead, TNMs damage fungal cells by abnormally promoting such synthesis, targeting not prot
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