Summary
The xyclose isomerase gene inEscherichia coli was cloned complementarily into a Leu2-negativeSchizosaccharomyces pombe mutant (ATCC 38399). The subsequent integration of the plasmid into the chromosomal DNA of the host yeast was verified by using the dot blot and southern blot techniques. The expressed xylose isomerase showed activity on a nondenaturing polyacrylamide gel. The expression of xylose isomerase gene was influenced by the concentration of nutrients in the fermentation broth. The yeast possessed a xylose isomerase activity of 20 nmol/min/mg by growing in an enriched medium containing yeast extract-malt extract-peptone (YMP) andd-xylose. The conversion ofd-xylose tod-xylulose catalyzed by xylose isomerase in the transformed yeast cells makes it possible to fermentd-xylose with ethanol as a major product. When the fermentation broth contained YMP and 5% (w/v)d-xylose, the maximal ethanol yield and productivity reached 0.42 g/g and 0.19 g/l/h, respectively.
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Chan, EC., Ueng, P.P., Eder, K.L. et al. Integration and expression of theEscherichia coli xylose isomerase gene inSchizosaccharomyces pombe . Journal of Industrial Microbiology 4, 409–417 (1989). https://doi.org/10.1007/BF01569636
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DOI: https://doi.org/10.1007/BF01569636