produce CO by reduction of CO2 needed for the synthesis of Acetyl-CoA from a methyl, coenzyme a (CoA) and corrinoid iron-sulfur protein. Other types show CODH being utilized to generate a proton motive force for the purposes of energy generation. CODH is used for the CO oxidation, producing two protons which are subsequently reduced to form dihydrogen (H2, known colloquially as molecular hydrogen), providing the necessary free energy to drive ATP generation. References Further reading * * EC 1.2.99 Iron enzymes Zinc enzymes Nickel enzymes Iron-sulfur enzymes Enzymes of known structure Protein families Dehydrogenase