pyruvate dehydrogenase complex

biochemistry

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July 13, 2026

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The pyruvate dehydrogenase complex is a crucial multienzyme complex in biochemistry that facilitates the oxidation of pyruvate. This process is a key step in cellular respiration, occurring after glycolysis and before the tricarboxylic acid (TCA) cycle.12

The complex converts pyruvate into acetyl coenzyme A (acetyl CoA) and carbon dioxide, releasing reducing equivalents in the form of NADH + H⁺. Acetyl CoA then enters the TCA cycle, where it is further broken down to generate energy for the cell. The pyruvate dehydrogenase complex is composed of several enzymes and coenzymes, including thiamine pyrophosphate (TPP), lipoamide, and coenzyme A. The regulation of this complex is important, as it can be inhibited by its product, acetyl CoA, helping to control the flow of nutrients through metabolic pathways.123

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metabolism
The oxidation of pyruvate
… and coenzymes collectively called the pyruvate dehydrogenase complex; i.e., a multienzyme complex in which the substrates are passed consecutively from one enzyme to the next, and the product of the reaction catalyzed by the first enzyme immediately becomes the substrate for the second enzyme in the complex. The overall reaction…
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… and coenzymes collectively called the pyruvate dehydrogenase complex; i.e., a multienzyme complex in which the substrates are passed consecutively from one enzyme to the next, and the product of the reaction catalyzed by the first enzyme immediately becomes the substrate for the second enzyme in the complex. The overall reaction…
Read More