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Abstract:
The nitrogenase complex is responsible for the reduction of an inert gas, dinitrogen (N2), to a bioavailable form of nitrogen, ammonia (NH3). At the heart of the catalytic component of molybdenum (Mo) nitrogenase resides the iron-molybdenum (FeMo) cofactor (also termed the M-cluster). This chapter will describe the key proteins involved in the biosynthesis of the M-cluster and how simple [Fe4S4] clusters are transformed into a complex, [MoFe7S9C-homocitrate] M-cluster and subsequently transferred to the active site of nitrogenase.