Concept explainers
(a)
Interpretation :
The relative glycogen phosphorylase activity when neither AMP nor ATP is present should be estimated from figure 15.15.
Introduction:
Glycogen phosphorylase is an enzyme which catalyzes the rate limiting step in glucogenolysis. It converts glycogen in animals into glucose-1-phosphate. ATP and glucose-6-phosphate act as allosteric inhibitors for glycogen phosphorylase because they reduce the affinity of glycogen phosphorylase for its substrate, inorganic phosphate. ATP is the end product of the glycogen phosphorylase enzyme. And glucose-1-phosphate released is readily converted into glucose-6-phosphate and participate in ATP production pathways. AMP acts as an allosteric activator for glycogen phosphorylase.
(b)
Interpretation:
The relative glycogen phosphorylase activity when AMP is present should be estimated from the figure 15.15.
Introduction:
Glycogen phosphorylase is an enzyme which catalyzes the rate limiting step in glucogenolysis. It converts glycogen in animals into glucose-1-phosphate. ATP and glucose-6-phosphate act as allosteric inhibitors for glycogen phosphorylase because they reduce the affinity of glycogen phosphorylase for its substrate, inorganic phosphate. ATP is the end product of the glycogen phosphorylase enzyme. And glucose-1-phosphate released is readily converted into glucose-6-phosphate and participate in ATP production pathways. AMP acts as an allosteric activator for glycogen phosphorylase.
(c)
Interpretation :
The relative glycogen phosphorylase activity when ATP is present should be estimated from the figure 15.15.
Introduction:
Glycogen phosphorylase is an enzyme which catalyzes the rate limiting step in glucogenolysis. It converts glycogen in animals into glucose-1-phosphate. ATP and glucose-6-phosphate act as allosteric inhibitors for glycogen phosphorylase because they reduce the affinity of glycogen phosphorylase for its substrate, inorganic phosphate. ATP is the end product of the glycogen phosphorylase enzyme. And glucose-1-phosphate released is readily converted into glucose-6-phosphate and participate in ATP production pathways. AMP acts as an allosteric activator for glycogen phosphorylase.
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Chapter 15 Solutions
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