Efficient one-step starch utilization by industrial strains of Saccharomyces cerevisiae expressing the glucoamylase and alpha-amylase genes from Debaryomyces occidentalis.

Amylolytic industrial polyploid strains of Saccharomyces cerevisiae (ATCC 4126, ATCC 9763 and ATCC 24858) expressing a glucoamylase gene (GAM1) or an alpha-amylase gene (AMY) from Debaryomyces occidentalis were developed. The glucoamylase activity of S. cerevisiae ATCC 9763 expressing the GAM1 gene was 3.