Glycolysis and Gluconeogenesis Regulation

The video explains the regulation of glycolysis and gluconeogenesis through fructose 2,6-bisphosphate, a potent allosteric activator of phosphofructokinase-1 (PFK-1). It highlights the hormonal regulation by glucagon and insulin, which influence the levels of fructose 2,6-bisphosphate through a bifunctional enzyme. The phosphorylation state of this enzyme determines whether glycolysis or gluconeogenesis is favored. Real-world examples illustrate how these processes are controlled in response to different metabolic states.

What is the role of fructose 2,6-bisphosphate in glycolysis?

How does fructose 2,6-bisphosphate affect phosphofructokinase-1?

What happens to phosphofructokinase-1 when fructose 2,6-bisphosphate is absent?

How does cyclic AMP influence the regulation of glycolysis?

Describe the effect of glucagon on glycolysis and gluconeogenesis.

What is the function of the bifunctional enzyme related to fructose 2,6-bisphosphate?

Explain the relationship between insulin and fructose 2,6-bisphosphate.

How does the phosphorylation state of the bifunctional enzyme affect its activity?

What is the consequence of high levels of fructose 2,6-bisphosphate on gluconeogenesis?

What is the overall control mechanism of glycolysis and gluconeogenesis?