Abstract
The distribution of Fructose 6-P,2-kinase:Fructose 2,6-bisphosphatase in rat and bovine heart, liver, and skeletal muscle tissues was examined. With DEAE-cellulose chromatography, two peaks (I and II) of Fru 6-P,2-kinase activity were detected in all tissue extracts. Peak I was the predominant form both in rat and bovine heart tissue, while peak II was the major form in liver and skeletal muscle. Antibodies to heart enzyme reacted specifically with peak I, and antibodies to liver enzyme reacted with peak II from both liver and skeletal muscle. All the isozymes were bifunctional. All the tissues examined contained other isozymes in minor amounts.
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