Which enzyme is activated by Acetyl-CoA in gluconeogenesis?

Which enzyme is activated by Acetyl-CoA in gluconeogenesis?

• A. PEPCK
• B. Fructose-1,6-bisphosphatase
• C. Pyruvate carboxylase
• D. Glycogen synthase

Answer: (C)

In gluconeogenesis, Acetyl-CoA plays a crucial role in the activation of pyruvate carboxylase. This enzyme catalyzes the conversion of pyruvate to oxaloacetate, which is a key step in the gluconeogenesis pathway that helps to replenish the supply of oxaloacetate needed to produce glucose. The activation of pyruvate carboxylase by Acetyl-CoA is essential because acetyl-CoA serves as an allosteric activator, indicating that there is sufficient energy available for the body to perform gluconeogenesis, especially during periods of fasting or low carbohydrate intake. This context underscores the role of Acetyl-CoA as a metabolic signal related to the energy status of the cell. By activating pyruvate carboxylase, Acetyl-CoA effectively drives the gluconeogenic pathway, facilitating the conversion of non-carbohydrate precursors into glucose, which is vital for maintaining blood glucose levels. The other enzymes listed, while important in various metabolic pathways, do not respond directly to Acetyl-CoA in the context of gluconeogenesis. Hence, pyruvate carboxylase is the enzyme specifically linked to the activation by Acetyl-CoA

In gluconeogenesis, Acetyl-CoA plays a crucial role in the activation of pyruvate carboxylase. This enzyme catalyzes the conversion of pyruvate to oxaloacetate, which is a key step in the gluconeogenesis pathway that helps to replenish the supply of oxaloacetate needed to produce glucose. The activation of pyruvate carboxylase by Acetyl-CoA is essential because acetyl-CoA serves as an allosteric activator, indicating that there is sufficient energy available for the body to perform gluconeogenesis, especially during periods of fasting or low carbohydrate intake.

This context underscores the role of Acetyl-CoA as a metabolic signal related to the energy status of the cell. By activating pyruvate carboxylase, Acetyl-CoA effectively drives the gluconeogenic pathway, facilitating the conversion of non-carbohydrate precursors into glucose, which is vital for maintaining blood glucose levels.

The other enzymes listed, while important in various metabolic pathways, do not respond directly to Acetyl-CoA in the context of gluconeogenesis. Hence, pyruvate carboxylase is the enzyme specifically linked to the activation by Acetyl-CoA