What is succinate dehydrogenase also known as?

Succinate dehydrogenase is indeed also known as Complex II of the electron transport chain. This enzyme plays a crucial role in both the citric acid cycle and the electron transport chain. In the citric acid cycle, succinate dehydrogenase catalyzes the oxidation of succinate to fumarate, a reaction that is coupled with the reduction of flavin mononucleotide (FMN) to FADH2.

The significance of succinate dehydrogenase being Complex II lies in its unique position; it is the only enzyme in the citric acid cycle that is also a part of the electron transport chain. While Complex I (NADH-ubiquinone oxidoreductase) and Complex III and IV are involved in electron transport as well, Complex II directly connects the citric acid cycle to the respiratory chain by transferring electrons from FADH2 to ubiquinone. This dual role enhances the efficiency of cellular respiration and energy production.