Both cannot be considered catalyst. There are 8 catalysts. Seven intermediates are produced from one enzyme. Meanwhile, aconitase enzyme is used for two intermediates.
- citrate synthase
- isocitrate dehydrogenase
- α-ketoglutarate dehydrogenase
- succinyl-CoA synthetase
- Succinate dehydrogenase
- malate dehydrogenase
Basically, there are:-
1) four dehydrogenases (oxidation process) - involved in hydrogen abstraction
2) one bond forming enzymes (synthetase)
3) one hydration enzyme. And one enzyme is involved in a dehydration+hydration step (a form of isomerization).