Mutations in the regulatory subunit of soluble phosphofructokinase from yeast

Mutant alleles of the gene PFK2 have been obtained that alter the sensitivity to ATP inhibition of the soluble yeast phosphofructokinase. One of the alleles makes the enzyme sensitive to micromolar concentrations of ATP. Intragenic revertants of PFK2 mutants confirm that the PFK2 gene determines not only the regulatory properties of the soluble enzyme but also the catalytic activity of particulate phosphofructokinase.