Cyclisation of GTP to precursor Z
NFS1 transfers sulfur from cysteine onto MOCS3
Transfer of sulfur from MOCS3-S-S onto MOCS2A
Sulfhydrylation and ring cleavage of precursor Z
Molybdenum ion transfer onto molybdopterin
Exchange of oxygen with sulfur in MoCo
Molybdenum cofactor biosynthesis