MUSCLE PHYSIOLOGY

Detailed explanation-1: -Phosphofructokinase (PFK) is a kinase enzyme that phosphorylates fructose 6-phosphate in glycolysis.

Detailed explanation-2: -An enzyme called hexokinase uses the energy of ATP to add a phosphate group to glucose to form glucose-6-phosphate. Similarly, an enzyme, called phosphofructokinase, uses ATP to add a phosphate group to fructose-6-phosphate to form fructose-1, 6-diphosphate.

Detailed explanation-3: -Phosphofructokinase catalyzes the conversion of fructose-6-phosphate to fructose-1, 6-diphosphate and is a key regulatory enzyme of glycolysis.

Detailed explanation-4: -Phosphofructokinase composed of PFKM subunits is involved in the sequence of events that breaks down glycogen to provide energy to muscle cells. Specifically, the enzyme converts a molecule called fructose-6-phosphate to a molecule called fructose 1, 6-bisphosphate.