The nitrogenase complex The dinitrogenase reductase(dimer The dinitrogenase reducto dimer) st oike dinitrogenase (tetramer) Fe-Mo cofactor ADP 4Fe-4s CHa CHa 4Fe-4S HO-C-COO 4Fe-4S ADP COO (P-cluster) HomocitrateThe nitrogenase complex The dinitrogenase (tetramer) The dinitrogenase reductase (dimer) The dinitrogenase reductase (dimer) ADP ADP 4Fe-4S 4Fe-4S 4Fe-4S (P-cluster) Fe-Mo cofactor