Abstract
Promoter and leader sequence of Bacillus stearothermophilus alpha-amylase gene were removed and the gene was joined in-frame to sequences encoding the leader region of Saccharomyces cerevisiae mating pheromone alpha-factor on plasmid p69A (a hybrid of pBR322 and S. cerevisiae 2-microns plasmid). S. cerevisiae cells were transformed with plasmids containing the hybrid genes, obtaining yeast transformants which exhibit a significant extra-cellular amylolytic activity in solid medium, but not in liquid medium. Levels of alpha-amylase activity in solid medium were found to depend on the mode of fusion of the alpha-amylase gene to the alpha-factor leader region.
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