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Improvement of Production and Secretion of Heterologous \alpha-Amylase from Saccharomyces cerevisiae.  

Choi, Sung-Ho (Department of Genetic Engineering, The University of Suwon)
Kim, Geun (Department of Genetic Engineering, The University of Suwon)
Publication Information
Microbiology and Biotechnology Letters / v.31, no.1, 2003 , pp. 36-41 More about this Journal
Abstract
In order to increase the production and secretion rate of mouse salivary $\alpha$-amylase from Saccharomyces cerevisiae, various experiments were attempted. A plasmid pCNNinv (AMY) was constructed by the substitution of ADCl promoter and native signal sequence of mouse salivary $\alpha$-amylase cDNA gene with PRBI promoter and yeast invertase leader sequence, which resulted in 25% increase in the production of $\alpha$-amylase in the culture medium. The respiratory deficient transformant carrying pCNNinv (AMY) were obtained by treating yeast cells with ethidium bromide, and the $\alpha$-amylase activities in the culture brothes of the respiratory-deficient transformants were 5-8 times higher than that of parental wild type strain. $\alpha$-Amylase activity was also increased 3 times when the 0.015% (w/v) of 2-mercaptoethanol was added to the culture medium.
Keywords
Heterologous \alpha-amylase production; Saccharomyces cerevisiae; respiratory deficient transformant; medium composition.;
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