The nitrogenase(固氮酶) complex mainly consists of two types of enzymes: the dinitrogenase and the dinitrogenase reductase The dinitrogenase(containing molybdenum thus called the MoFe protein) is a tetramer of two different subunits, containing multiple 4Fe-4S centers and two Mo-Fe clusters The dinitrogenase reductase(also called the Fe protein) is a dimer of two identical subunits, containing a single FeaS, redox center. The nitrogenase complex is highly conserved among different diazotrophs• The nitrogenase (固氮酶) complex mainly consists of two types of enzymes: the dinitrogenase and the dinitrogenase reductase. • The dinitrogenase (containing molybdenum, thus called the MoFe protein) is a tetramer of two different subunits, containing multiple 4Fe-4S centers and two Mo-Fe clusters. • The dinitrogenase reductase (also called the Fe protein) is a dimer of two identifcal subunits, containing a single Fe4 -S4 redox center. • The nitrogenase complex is highly conserved among different diazotrophs