<Tr> <Td> 9 </Td> <Td> L - Malate + NAD </Td> <Td> Oxaloacetate + NADH + H </Td> <Td> Malate dehydrogenase </Td> <Td> Oxidation </Td> <Td> reversible (in fact, equilibrium favors malate), generates NADH (equivalent of 2.5 ATP) </Td> </Tr> <Tr> <Td> 10 / 0 </Td> <Td> Oxaloacetate + Acetyl CoA + H O </Td> <Td> Citrate + CoA - SH </Td> <Td> Citrate synthase </Td> <Td> Aldol condensation </Td> <Td> This is the same as step 0 and restarts the cycle . The reaction is irreversible and extends the 4C oxaloacetate to a 6C molecule </Td> </Tr> <P> Mitochondria in animals, including humans, possess two succinyl - CoA synthetases: one that produces GTP from GDP, and another that produces ATP from ADP . Plants have the type that produces ATP (ADP - forming succinyl - CoA synthetase). Several of the enzymes in the cycle may be loosely associated in a multienzyme protein complex within the mitochondrial matrix . </P> <P> The GTP that is formed by GDP - forming succinyl - CoA synthetase may be utilized by nucleoside - diphosphate kinase to form ATP (the catalyzed reaction is GTP + ADP → GDP + ATP). </P>

What is the function of gtp in krebs cycle