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- W2058082013 abstract "In order to maximize the glucoamylase production by recombinant Saccharomyces cerevisiae in batch culture, first a temperature-controlled expression system for a foreign gene in S. cerevisiae was constructed. A temperature-sensitive pho80 mutant of S. cerevisiae for the PHO regulatory system, YKU131, was used for this purpose. A DNA fragment bearing the promoter of the PHO84 gene, which encodes an inorganic phosphate (Pi) transporter of S. cerevisiae and is derepressed by Pi starvation, was used as promoter. The glucoamylase gene connected with the PHO84 promoter was ligated into a YEp13 vector, designated pKU122. When the temperature-sensitive pho80ts mutant harboring the plasmid pKU122 is cultivated at a lower temperature, the expression of glucoamylase gene is repressed, but at a higher temperature it is expressed. Next the effect of temperature on the specific growth rate, μ, and specific production rate, ρ, was investigated. Maximum values of ρ and ρ at various temperatures were at 30°C and 34°C, respectively. The optimal cultivation temperature strategy for maximum production of glucoamylase by this recombinant strain in batch culture was then determined by the Maximum principle using the relationships of μ and ρ to the cultivation temperature. Finally, the optimal strategy was experimentally realized by changing the cultivation temperature from Tμ (30°C) to Tρ (34°C) at the switching time, ts." @default.
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- W2058082013 date "1998-03-01" @default.
- W2058082013 modified "2023-09-27" @default.
- W2058082013 title "Maximum glucoamylase production by a temperature-sensitive mutant of Saccharomyces cerevisiae in batch culture" @default.
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- W2058082013 doi "https://doi.org/10.1038/sj.jim.2900465" @default.
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