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. 1981 Sep;147(3):935–943. doi: 10.1128/jb.147.3.935-943.1981

Tn10 insertions in the pfkB region of Escherichia coli.

F Daldal, D G Fraenkel
PMCID: PMC216131  PMID: 6268614

Abstract

The locus pfkB is known to determine expression of a minor phosphofructokinase (Pfk-2). Pfk-2 and pfkB seem to be dispensable, since Tn10 insertions in pfkB, as well as deletions from Tn10 nearby, are obtainable. Strains deleted for both pfkA and pgkB are unable to grow at all on sugars whose primary route of metabolism is via fructose 6-phosphate, confirming earlier reports implicating the low Pfk-2 activity, rather than the pentose-phosphate pathway, as needed for the slow growth on sugars of pfkA pfkB+ strains. The pfkB locus probably contains the structural gene for Pfk-2, since a mutation closely linked to pfkB1, which affects growth on glycerol, is found to alter the enzyme. Partial phenotypic suppression of the pfkA mutant phenotype results from Tn10 insertion very close to the pps gene, ca. 0.5 min from pgkB. The insertion does not clearly affect either Pfk-2 or phosphoenolpyruvate synthetase, and the mechanism of suppression is unclear.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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