The bacterial enzyme that allows atmospheric nitrogen to be converted to ammonium. Without nitrogenase, atmospheric nitrogen can only be converted to ammonium under high pressure and temperatures. Nitrogenase requires a low oxygen environment to function.

The enzyme involved in the conversion of atmospheric nitrogen gas into ammonia.

The enzyme complex catalyzing the reaction of nitrogen fixation.

Nitrogenase is the enzyme used by some organisms to fix atmospheric nitrogen gas (N2). It is the only known family of enzymes which accomplishes this process. Dinitrogen is relatively inert, this is because each atom of nitrogen has three open orbitals in its outer electron shell to bond with another atom, and that means that if two nitrogen atoms bond to each other, they do so in all three of these orbitals.