nifH The key enzymatic reactions in nitrogen fixation are catalyzed by the nitrogenase complex, which has 2 components: the iron protein and the molybdenum-iron protein. Nitrogenase reductase Nitrogenase iron protein 1 Nitrogenase component II MGKLRQIAFYGKGGIGKSTTSQNTLAALVEMGQKILIVGCDPKADSTRLILNTKLQDTVLHLAAEAGSVEDLEVEDVVKIGYKGIKCTEAGGPEPGVGCAGRGVITAINFLEENGAYDDVDYVSYDVLGDVVCGGFAMPIRENKAQEIYIVMSGEMMALYAANNIAKGILKYANSGGVRLGGLICNERKTDRELELAEALAAKLGCKMIHFVPRNNVVQHAELRRETVIQYDPTCSQAQEYRELARKIHENSGKGVIPTPITMEELEEMLMDFGIMQSEEDREKQIAEMEAAMKA 295 NIFH1_RHOCA Nitrogenase Fe protein 1