Allosteric and non-allosteric E. coli phosphofructokinases: effects on growth.

In wild type $\text{Escherichia coli}$ K-12 ca. 90% of phosphofructokinase is known to be the allosteric enzyme Pfk-1, and the rest is Pfk-2, a non-allosteric enzyme. An isogenic strain series has now been constructed with varying combinations and amounts of Pfk-1 and Pfk-2 (e.g., no Pfk-1, high level of Pfk-2; normal level Pfk-1, high level Pfk-2, etc.). In minimal medium with glucose, glucose-6-P, and glycerol, aerobically and anaerobically, provided there is adequate total amount of enzyme, what allosteric type it is does not make much difference to growth rate or yield of this organism.