Final answer:
Citrate synthase is a citric acid cycle enzyme that is not an iron-sulfur protein. It catalyzes the formation of citrate from oxaloacetate and acetyl-CoA. Another enzyme without an iron-sulfur center is succinate dehydrogenase, which is part of both the citric acid cycle and the electron transport chain.
Step-by-step explanation:
The citric acid cycle, also known as the Kreb's cycle, is a key metabolic pathway that occurs in the matrix of mitochondria. It consists of a series of redox and decarboxylation reactions that produce various compounds, including ATP, NADH, and FADH₂. One of the enzymes involved in the citric acid cycle that is not an iron��sulfur protein is citrate synthase, which catalyzes the formation of citrate from oxaloacetate and acetyl-CoA.
Another enzyme in the cycle that lacks an iron��sulfur center is succinate dehydrogenase, which is distinct in that it is embedded in the inner mitochondrial membrane whereas most other enzymes in the cycle are soluble within the mitochondrial matrix. The function of succinate dehydrogenase is to convert succinate to fumarate and it is directly involved in the electron transport chain as it passes electrons to ubiquinone.