The - nitrogenase(固氮酶) complex mainly consists of two types of enzymes: the dinitrogenase. and the dinitrogenase reductase. The dinitrogenase(containing molybdenum, tE 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 4 Fe-4S 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，钼, 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 4Fe-4S redox center. • The nitrogenase complex is highly conserved among different diazotrophs