Abstract
The gene encoding Schwanniomyces occidentalis alpha-amylase (AMY) was introduced into the chromosomal delta sequences of an industrial strain of Saccharomyces cerevisiae. To obtain a strain suitable for commercial use, an delta-integrative cassette devoid of bacterial DNA sequences was constructed that contains the AMY gene and aureobasidin A resistance gene (AUR1-C) as the selection marker. The AMY gene was expressed under the control of the alcohol dehydrogenase gene promoter (ADC1p). The alpha-amylase activity of Sacc. cerevisiae transformed with this integrative cassette was 6 times higher than that of Sch. occidentalis. The transformants (integrants) were mitotically stable after 100 generations in nonselective medium.
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