Stable recombinant yeasts for fermenting xylose to ethanol


Ontology type: sgo:Patent     


Patent Info

DATE

N/A

AUTHORS

Nancy W. Y. Ho , Zheng-Dao Chen

ABSTRACT

Described are recombinant yeast which ferment xylose to ethanol and which maintain their ability to do so when cultured for numerous generations in non-selective media. The preferred yeast contain multiple copies of integrated genes encoding xylose reductase, xylitol dehydrogenase, and xylulokinase fused to promoters which are non-glucose inhibited and which do not require xylose for induction. Also described are preferred methods for integrating multiple copies of exogenous DNA into host cells by transforming cells with replicative/integrative vectors, and then replicating the cells a number of times under selective pressure to promote retention of the vector in subsequent generations. The replicated vectors thus serve to integrate multiple copies of the exogenous DNA into the host cells throughout the replication/selection phase. Thereafter the selective pressure can be removed to promote loss of the vector in subsequent generations, leaving stable integrants of the exogenous DNA. More... »

Related SciGraph Publications

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  • 1993-09. Cloning and improving the expression ofPichia stipitis xylose reductase gene inSaccharomyces cerevisiae in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 1990-03. Xylulokinase activity in various yeasts includingSaccharomyces cerevisiae containing the cloned xylulokinase gene in APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
  • 1989-04. The fermentation of xylose —an analysis of the expression of Bacillus and Actinoplanes xylose isomerase genes in yeast in APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
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