1.2.99.6	carboxylate reductase	no activity in Clostridium aceticum	
3.5.4.9	methenyltetrahydrofolate cyclohydrolase	Clostridium aceticum	
4.2.1.39	gluconate dehydratase	Clostridium aceticum	
6.3.4.3	formate-tetrahydrofolate ligase	Clostridium aceticum