FeMoco
![Structure of the FeMo cofactor showing the sites of binding to nitrogenase (the amino acids cys and his).](/Images/godic/202501/12/FeMoco_cluster.svg3043.png")
FeMoco is the primary cofactor of nitrogenase. Nitrogenase is the enzyme that catalyzes the conversion of atmospheric N2 into ammonia (NH3), through the process known as nitrogen fixation. Containing iron and molybdenum, the cofactor is called FeMoco. Its stoichiometry is Fe7MoS9C.