Question

How is glucose synthesized from pyruvate?

   How is glucose synthesized from pyruvate?

Bioprocess Engineering

Bioprocess Engineering

Michael L Shuler 2nd Edition

Chapter 5, Problem 5

Instant Answer

Solved by Expert Sydney Atkins

06/19/2020

Step 1

This process occurs mainly in the liver and, to a lesser extent, in the kidneys. Here are the steps involved in synthesizing glucose from pyruvate: Show more…

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How is glucose synthesized from pyruvate?

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Key Concepts

Gluconeogenesis

Gluconeogenesis is the metabolic pathway that produces glucose from non-carbohydrate precursors such as pyruvate, lactate, and amino acids. It is essential for maintaining blood glucose levels during fasting or intense exercise and is primarily active in the liver and kidneys. This pathway involves a series of enzymatic reactions that are mostly the reverse of glycolysis, with specific bypass steps to overcome the irreversible reactions present in glycolysis.

Pyruvate Carboxylase

Pyruvate carboxylase is the enzyme that catalyzes the conversion of pyruvate to oxaloacetate. This reaction is the first committed step in gluconeogenesis and requires biotin as a cofactor and ATP for energy. It occurs in the mitochondria and provides a critical link between the metabolism of pyruvate and the generation of glucose.

Phosphoenolpyruvate Carboxykinase

Phosphoenolpyruvate carboxykinase (PEPCK) is the enzyme responsible for converting oxaloacetate to phosphoenolpyruvate (PEP). This step is necessary to continue the reversal of glycolysis and involves the consumption of GTP, making it a key regulatory point in gluconeogenesis. The activity of PEPCK is tightly regulated to ensure appropriate glucose production in response to metabolic demands.

Bypassing Irreversible Glycolytic Steps

In gluconeogenesis, certain irreversible glycolytic reactions are bypassed using alternative enzymes and pathways. These bypass reactions, including those catalyzed by pyruvate carboxylase and PEPCK, allow the metabolic pathway to proceed in the reverse direction of glycolysis. This bypass mechanism is crucial for enabling the synthesis of glucose from molecules like pyruvate, which cannot simply be reversed through the typical glycolytic enzymes.

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