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Radioactively labelled material from yeast cells grown in the presence of [32P]phosphate was specifically recognized by antibodies raised against yeast phosphofructokinase. Purified yeast phosphofructokinase was phosphorylated in a cyclic AMP-independent manner by a protein kinase enriched from yeast extracts. This phosphorylation occurred specifically on the beta-subunit, and 0.56 mol of phosphate/mol of subunit was incorporated. The results indicate the phosphorylation of yeast phosphofructokinase both in vivo and in vitro. Phosphofructokinase phosphorylated in vitro was more stable against proteolytic degradation compared to the non-phosphorylated enzyme.
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