Metabolism | Regulation of the Transition Stage

📚 Premium Notes & Illustrations for Regulation of the Transition Stage: https://www.ninjanerd.org/lecture/regulation-of-the-transition-stage-2

Ninja Nerds!
In this metabolism lecture, Professor Zach Murphy focuses on the Regulation of the Transition Stage—the critical control point that governs the conversion of pyruvate to acetyl-CoA via the pyruvate dehydrogenase complex (PDC). This phase determines whether carbohydrates proceed toward full oxidative metabolism or are diverted into alternative pathways, making its regulation essential for metabolic flexibility.

We begin by reviewing the pyruvate dehydrogenase complex itself and how its activity is influenced by energy status, substrate availability, and hormonal control. You’ll learn how high levels of acetyl-CoA, NADH, and ATP inhibit the complex, while pyruvate, NAD⁺, and ADP act as activators, helping the cell adapt to fed or fasting states.

The lecture emphasizes covalent regulation through PDH kinase, which phosphorylates and inactivates the enzyme, and PDH phosphatase, which reactivates it. We discuss how hormones such as insulin activate PDH in well-fed states, promoting acetyl-CoA formation for entry into the TCA cycle or fatty acid synthesis, especially in liver and adipose tissue.

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