Abstract
The expression and secretion of Rhizopus oryzae glucoamylase were studied in the yeast Saccharomyces cerevisiae. Rhizopus oryzae glucoamylase was highly expressed and efficiently secreted into a medium to a high level (above 300 mg/l) under control of a yeast promoter and the original signal sequence. Excess expression of the secretable glucoamylase with high copy number plasmid slightly decreased growth of the transformant cells in glucose medium but not in fructose medium.
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