Pyruvate decarboxylase

Definition

Pyruvate decarboxylase is an enzyme that catalyzes the decarboxylation of pyruvate to acetaldehyde and carbon dioxide. It plays a crucial role in the fermentation process, particularly in yeast and other microorganisms.

5 Must Know Facts For Your Next Test

1. Pyruvate decarboxylase is essential for converting pyruvate to acetaldehyde in alcoholic fermentation.
2. This enzyme requires thiamine pyrophosphate (TPP) as a cofactor for its activity.
3. It is commonly found in organisms such as yeast, which use it during anaerobic respiration.
4. In addition to acetaldehyde, pyruvate decarboxylase also releases carbon dioxide as a byproduct.
5. The presence of this enzyme allows microorganisms to regenerate NAD+ from NADH, enabling glycolysis to continue under anaerobic conditions.

Review Questions

Related terms

Fermentation:

A metabolic process that converts sugar to acids, gases, or alcohol in the absence of oxygen.

Glycolysis:

The enzymatic breakdown of glucose into pyruvate, producing ATP and NADH.

Thiamine Pyrophosphate (TPP): A coenzyme derived from vitamin B1, essential for the activity of several enzymes including pyruvate decarboxylase.