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- W2060210005 abstract "The global gene expression of cultured Saccharomyces cerevisiae protoplasts was compared with that of cells using DNA microarray. Quantitative and qualitative analyses revealed that after 6 h of cultivation, 416 gene transcript levels (about 7.1% in all) in the cultured protoplasts were different from those in the cells. Various characteristics and functions of the protoplasts were predicted from the analysis of the gene functions. The cultured protoplasts were more sensitive to oxidative stress than the cultured cells. Their cell cycles were arrested at the G1 phase and cell wall synthesis was promoted. Carbohydrate metabolism was activated in cultured protoplasts, while amino acid biosynthesis was inhibited. Furthermore, some genes associated with the secretory pathway of metabolites were activated, leading to active secretion of these metabolites into the broth. As an example of the application of DNA microarray analysis, we developed two novel methods for the production of useful enzymes based on the characteristics of protoplasts. One was the production of invertase based on the activated secretory pathway, while the other was the production of alpha-glucosidase based on the activated carbohydrate metabolism. The secretion of invertase and alpha-glucosidase was promoted in cultured protoplasts. The invertase and alpha-glucosidase productivities in the cultured protoplasts were 657 U and 218 U, respectively. On the other hand, only 227 U of invertase was produced, while alpha-glucosidase was not detected, in the cultured cells. The fragile protoplasts were immobilized in agarose gel to protect them from hydrodynamic stress. Four repeated-batch cultures with the immobilized protoplasts were performed, leading to the production of 1574 U of invertase and 739 U of alpha-glucosidase. The same productivities were obtained when this system was scaled up by 10-fold (invertase: 13304 U; alpha-glucosidase: 7688 U)." @default.
- W2060210005 created "2016-06-24" @default.
- W2060210005 creator A5020140334 @default.
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- W2060210005 date "2004-01-01" @default.
- W2060210005 modified "2023-09-23" @default.
- W2060210005 title "Analysis of gene expression in yeast protoplasts using DNA microarrays and their application for efficient production of invertase and α-glucosidase" @default.
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- W2060210005 doi "https://doi.org/10.1016/s1389-1723(04)70187-5" @default.
- W2060210005 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16233611" @default.
- W2060210005 hasPublicationYear "2004" @default.
- W2060210005 type Work @default.