Construction of a direct starch-fermenting industrial strain of Saccharomyces cerevisiae producing glucoamylase, α-amylase and debranching enzyme
Authors:
- 4 February 2010
- journal article
- Published by Springer Nature in Biotechnology Letters
- Vol. 32 (5) , 713-719
Abstract
To develop a strain of Saccharomyces cerevisiae that produces ethanol directly from starch, two integrative vectors were constructed to allow the simultaneous multiple integration of the Aspergillus awamori glucoamylase gene (GA1) and the Debaryomyces occidentalis α-amylase gene (AMY) and glucoamylase with debranching activity gene (GAM1) into the chromosomes of an industrial strain of S. cerevisiae. The GA1 and AMY genes were constitutively expressed under the ADC1 promoter in S. cerevisiae using the double δ-integration system. The GAM1 gene was constitutively expressed under the corresponding promoter using the double 18S rDNA-integration system. The recombinant industrial strain secreting biologically active α-amylase, glucoamylase and debranching enzyme was able to ferment starch to ethanol in a single step. The new strain produced 8% (v/v) ethanol (62.8 g l−1) from 20% (w/v) soluble starch after 2 days, fermentation.Keywords
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