Abstract
Aspergillus niger glucoamylase GA 1 cDNA was inserted in between the yeast PGK promoter and terminator on plasmid pMA91. The resultant plasmid pMAG69 was introduced into Saccharomyces cerevisiae GRF18 by protoplast transformation. The A niger GA I cDNA was expressed efficiently under the contiol of PGK promoter and 99% of the gene products were secreted into the culture medium using its own signal sequence The recombmant yeast can digest 87% of starch in 2 d in the medium containing 10% starch. The recombinant plasmid pMAG69 can exist stably in 5. cerevisiae.
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