Nitrogenase

Nitrogenases (EC 1.18.6.1EC 1.19.6.1) are enzymes used by some organisms to fix atmospheric nitrogen gas (N₂). There is only one known family of enzymes that accomplishes this process. Dinitrogen is quite inert because of the strength of its N≡N triple bond. To break one nitrogen atom away from another requires breaking all three of these chemical bonds.