Abstract
Zymolyase was purified from Zymolyase-60,000 by ion-exchange chromatography with sugar and gel filtration. Zymolyase was separated into the two protein fractions A and B. Neither alone could lyse yeast cells, but together showed high lytic activity. Zymolyase A and B were β-1,3-glucanase and alkaline protease, respectively. On stepwise treatment of yeast cells with the enzymes, yeast cells were lysed only by treatment with Zymolyase A after pretreatment with Zymolyase B. Zymolyase A lysed yeast cells in the presence of 2-mercaptoethanol, but B could not even at high concentration. Zymolyase B decreased the turbidity of a yeast cell suspension by about 13%.

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