Structure of C-cluster including only one coordinating
residue,
cysteine, and the ligands from (A) CODHRr (PDB 1JQK),
(B) CODHCh II (PDB 1SU8), (C) CODHCh II at 320 mV (PDB 3B53), (D) CODHCh II at 600 mV (PDB 3B51), (E) cyanide-bound CODHCh II at 320
mV (PDB 3I39), (F) CO2-bound CODHCh II
at 600 mV (PDB 3B52), (G) cyanide-bound CODH/ACSMt (PDB 3I04), (H) CODH/ACSMt (PDB 3I01), (J) n-BICt-bound CODH/ACSMt (PDB 2YIV), (K) CO-bound CODHMb (PDB 3CF4). Atom colors: Dark gray (iron), orange (sulfide), red (oxygen),
blue (nitrogen), white (carbon), dark green (nickel).