3I04 OXIDOREDUCTASE/TRANSFERASE, PROTEIN-PROTEIN COMPLEX, 4FE-4S, CARBON DIOXIDE FIXATION, ELECTRON TRANSPORT, IRON, IRON-SULFUR, METAL-BINDING, NICKEL, OXIDOREDUCTASE, TRANSPORT, TRANSFERASE, OXIDOREDUCTASE/TRANSFERASE COMPLEX CYANIDE-BOUND STRUCTURE OF BIFUNCTIONAL CARBON MONOXIDE DEHYDROGENASE/ACETYL-COA SYNTHASE FROM MOORELLA THERMOACETICA, CYANIDE-BOUND C-CLUSTER