Describe the metabolic pathway of β-oxidation; calculate the ATP from the complete oxidation of

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Describe the metabolic pathway of β-oxidation; calculate the...

Key Concepts

ATP Yield from Fatty Acid Oxidation

The complete oxidation of a fatty acid involves both ?-oxidation and the citric acid cycle. In each ?-oxidation cycle, the production of one FADH2, one NADH, and one acetyl-CoA is achieved, with the acetyl-CoA subsequently generating additional NADH and FADH2 in the citric acid cycle. The overall ATP calculation takes into account the ATP cost of activating the fatty acid and the ATP produced from each NADH and FADH2 via oxidative phosphorylation, resulting in a high net energy yield that is characteristic of fatty acid metabolism.

Ketone Bodies Production (Ketogenesis)

Ketone bodies are produced in the liver under conditions where carbohydrate availability is low, such as during prolonged fasting, a low-carbohydrate high-fat diet, or uncontrolled diabetes. In such situations, the liver converts excess acetyl-CoA generated from enhanced ?-oxidation into ketone bodies because the citric acid cycle is limited by the availability of oxaloacetate. These ketone bodies are then released into the bloodstream to serve as an alternative energy source for tissues like the brain, muscle, and heart.

?-Oxidation

?-Oxidation is a mitochondrial metabolic pathway that breaks down fatty acids by repeatedly cleaving two-carbon acetyl-CoA units from the acyl-CoA chain. Each cycle of ?-oxidation involves dehydrogenation, hydration, another dehydrogenation, and thiolysis reactions. These reactions generate reduced coenzymes (FADH2 and NADH) that feed electrons into the electron transport chain, leading to ATP production, while the acetyl-CoA produced enters the citric acid cycle for further energy extraction.

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