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• W2000244693 abstract "In Escherichia coli, the uptake and phosphorylation of glucose is carried out mainly by the phosphotransferase system (PTS). Despite the efficiency of glucose transport by PTS, the required consumption of 1 mol of phosphoenolpyruvate (PEP) for each mol of internalized glucose represents a drawback for some biotechnological applications where PEP is a precursor of the desired product. For this reason, there is considerable interest in the generation of strains that can transport glucose efficiently by a non-PTS mechanism. The purpose of this work was to study the effect of different gene expression levels, of galactose permease (GalP) and glucokinase (Glk), on glucose internalization and phosphorylation in a E. coli PTS(-) strain. The W3110 PTS(-), designated VH32, showed limited growth on glucose with a specific growth rate (mu) of 0.03 h(-1). A low copy plasmid family was constructed containing E. coli galP and glk genes, individually or combined, under the control of a trc-derived promoter set. This plasmid family was used to transform the VH32 strain, each plasmid having different levels of expression of galP and glk. Experiments in minimal medium with glucose showed that expression of only galP under the control of a wild-type trc promoter resulted in a mu of 0.55 h(-1), corresponding to 89% of the mu measured for W3110 (0.62 h(-1)). In contrast, no increase in specific growth rate (mu) was observed in VH32 with a plasmid expressing only glk from the same promoter. Strains transformed with part of the plasmid family, containing both galP and glk genes, showed a mu value similar to that of W3110. Fermentor experiments with the VH32 strain harboring plasmids pv1Glk1GalP, pv4Glk5GalP, and pv5Glk5GalP showed that specific acetate productivity was twofold higher than in W3110. Introduction of plasmid pLOI1594, coding for pyruvate decarboxylase and alcohol dehydrogenase from Zymomonas mobilis, to strain VH32 carrying one of the plasmids with galP and glk caused a twofold increase in ethanol productivity over strain W3110, also containing pLOI1594." @default.
• W2000244693 created "2016-06-24" @default.
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• W2000244693 date "2003-06-23" @default.
• W2000244693 modified "2023-10-14" @default.
• W2000244693 title "Expression of<i>galP</i>and<i>glk</i>in a<i>Escherichia coli</i>PTS mutant restores glucose transport and increases glycolytic flux to fermentation products" @default.
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• W2000244693 doi "https://doi.org/10.1002/bit.10702" @default.
• W2000244693 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12889033" @default.
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