Abstract
A naturally occurring azasterol has been shown to inhibit sterol transmethylation in both in vitro and in vivo in the yeast Saccharomyces cerevisiae. The inhibition was competitive, with a calculated dissociation constant of 43 muM. The compound prevented the accumulation of ergosterol in aerobically adapting cells. Cultures forced to gain energy by respiration were found to be much more sensitive to growth inhibition by the azasterol than those cells fermenting glucose. The growth inhibition is reversible at low concentrations of the azasterol.
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