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J Bacteriol. 1986 Apr; 166(1): 319–327.
PMCID: PMC214595

Expression of the Escherichia coli pfkA gene in Alcaligenes eutrophus and in other gram-negative bacteria.


The Escherichia coli pfkA gene has been cloned in the non-self-transmissible vector pVK101 from hybrid plasmids obtained from the Clarke and Carbon clone bank, resulting in the plasmids pAS300 and pAS100; the latter plasmid also encoded the E. coli tpi gene. These plasmids were transferred by conjugation to mutants of Alcaligenes eutrophus which are unable to grow on fructose and gluconate due to lack of 2-keto-3-deoxy-6-phosphogluconate aldolase activity. These transconjugants recovered the ability to grow on fructose and harbored pAS100 or pAS300. After growth on fructose, the transconjugants contained phosphofructokinase at specific activities between 0.73 and 1.83 U/mg of protein, indicating that the E. coli pfkA gene is readily expressed in A. eutrophus and that the utilization of fructose occurs via the Embden-Meyerhof pathway instead of the Entner-Doudoroff pathway. In contrast, transconjugants of the wild type of A. eutrophus, which are potentially able to catabolize fructose via both pathways, grew at a decreased rate on fructose and during growth on fructose did not stably maintain pAS100 or pAS300. Indications for a glycolytic futile cycling of fructose 6-phosphate and fructose 1,6-bisphosphate are discussed. Plasmid pA 100 was also transferred to 14 different species of gram-negative bacteria. The pfkA gene was expressed in most of these species. In addition, most transconjugants of these strains and of A. eutrophus exhibited higher specific activities of triosephosphate isomerase than did the corresponding parent strains.

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Selected References

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