During aerobic respiration, the oxidative decarboxylation of a 3-carbon compound takes place in the mitochondrial matrix. This crucial gateway reaction strictly requires the presence of Mg ²⁺ ions. Which of the following enzymes catalyzes this specific reaction?

Step-by-step solution

The oxidative decarboxylation of the 3-carbon compound (pyruvate) occurs in the mitochondrial matrix and serves as the link reaction between glycolysis and the Krebs cycle. The enzyme catalyzing this reaction is pyruvate dehydrogenase, which requires Mg ²⁺ ions, thiamine pyrophosphate (TPP), and lipoic acid as cofactors. Pyruvate kinase is involved in glycolysis in the cytoplasm. Succinate dehydrogenase is an enzyme of the Krebs cycle located in the inner mitochondrial membrane. Alcohol dehydrogenase is involved in