FDH: formate dehydrogenase; CODH/ACS: bifunctional carbon monoxide dehydrogenase/acetyl-CoA synthase; ADH: alcohol dehydrogenase; CFeSP: corrinoid iron(Fe)-sulfur(S) protein; THF: tetrahydrofolate (vitamin B9, folic acid derivative); HSCoA: thiol (SH) functional group Coenzyme A; CH3-CO-S-CoA: acetyl-Coenzyme A intermediate