Compartmentalization of Citric Acid Cycle Components...

Name: Problem 14, Chapter 19: Principles of Biochemistry
Uploaded: 2021-03-13T11:14:34-08:00
Duration: 1 min 15 s
Channel: Aadit Sharma
Description: Compartmentalization of Citric Acid Cycle Components Isocitrate dehydrogenase is found only in mitochondria, but malate dehydrogenase is found in both the cytosol and mitochondria. What is the role of cytosolic malate dehydrogenase?

Compartmentalization of Citric Acid Cycle Components Isocitrate dehydrogenase is found only in mitochondria, but malate dehydrogenase is found in both the cytosol and mitochondria. What is the role of cytosolic malate dehydrogenase?

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Key Concepts

Metabolic Compartmentalization

Metabolic compartmentalization refers to the segregation of cellular processes into distinct organelles, which allows for different environments and regulatory mechanisms. This spatial separation is important for controlling and optimizing various biochemical pathways, including energy production and redox balance.

Malate-Aspartate Shuttle

The malate-aspartate shuttle is a biochemical system used to transfer reducing equivalents, particularly NADH, from the cytosol into the mitochondria. Since NADH itself cannot cross the mitochondrial inner membrane, cytosolic malate dehydrogenase converts oxaloacetate to malate, which can then be transported into the mitochondria where it is converted back, effectively moving the reducing power needed for ATP generation.

Enzymatic Function in Redox Reactions

Malate dehydrogenase catalyzes the reversible conversion between malate and oxaloacetate coupled with the interconversion of NADH and NAD+. This reaction is key in maintaining redox balance by allowing cytosolic NADH to indirectly contribute to mitochondrial energy production, thereby linking glycolysis and oxidative phosphorylation.

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