What is an effect of cAMP-dependent protein kinase (PKA) inactivation of the liver isozyme but not the muscle isozyme? Phosphate from the dephosphorylation of the liver isozyme is used to generate ATP and provide energy for movement. Under stress (fight-or-flight) conditions, the liver can use glycolysis to break down glucose. Glycolysis is inhibited in the liver, but not muscle, when blood sugar is low. Glycogen synthesis is promoted in the liver as an energy store.

Phosphate from the dephosphorylation of the liver isozyme is used to generate ATP and provide energy for movement.

Glycolysis is inhibited in the liver, but not muscle, when blood sugar is low.

Explanation:

cAMP-dependent protein kinase (PKA) is a group of enzymes that function in the presence or absence of cyclic AMP (cAMP). They depend on the release of this cAMp to initiate response such as regulation of glucagon, sugar and even lipid metabolism in the body.

Phosphorylation of the cAMP-dependent kinase leads to the inactivation of phosphorylase in the liver thereby inhibiting glycolysis which is the break down of glucose molecules to form energy (ATP) and stimulates glycogenesis which is the break down of glycogen in the liver to form energy. When the blood glucose level reduces, elevated levels of glucagon leads to the increase in the level of cAMP  which causes phosphorylation and inactivation of the liver enzyme thus glycolysis and stimulation of gluconeogenesis.

In the muscle cells, the release of cAMP instead causes the stimulation of glycogenolysis by phosphorylating glycogen through phosphorylase kinase and glycolysis and inhibition of glycogenesis by inhibiting glycogen synthase.

cAMP- dependent protein kinase inactivation of the liver isozyme and not the muscle isozyme is to sure rapid supply of energy to the muscle cells for movement and also from the liver through the breakdown of glycogen stored in it. The other two options do not occur by the action of cAMP-dependent protein kinase .

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