Abstract
Three strains of filamentous fungi have been isolated from potato sprouts to obtain an enzyme degrading the glycoalkaloids. All of the strains hydrolyzed α-chaconine and not α-solanine when grown on the sprouts. From strain HP341, identified as Plectosphaerella cucumerina, the enzyme hydrolyzing α-chaconine was purified on columns of DEAE-Toyopearl and Phenyl-Toyopearl. The partially purified enzyme hydrolyzed α-chaconine to β 1-chaconine but not to β 2 - or γ-chaconine, suggesting that the enzyme is a rhamnosidase specific for the hydrolysis of the rhamnose (C 1–C 4) glucose linkage in α-chaconine. Conversion of α-chaconine to β 1-chaconine may be the first step of detoxification for filamentous fungi to grow on potato sprouts that accumulated antifungal α-chaconine.
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