Succinyl-CoA GDP Pi Succinyl-CoA Synthase Succinate GTP CoA Succinate FAD Succinate Dehydrogenase Fumarate FADH2 Fumarate Fumarase Malate Malate NAD Malate Dehydrogenase Oxaloacetate NADH Acetyl-CoA 3 NADH GTP FADH2 2 CO2