This family contains the MoaE protein that is involved in biosynthesis of molybdopterin [1]. Molybdopterin, the universal component of the pterin molybdenum cofactors, contains a dithiolene group serving to bind Mo. Addition of the dithiolene sulfurs to a molybdopterin precursor requires the activity of the converting factor. Converting factor contains the MoaE and MoaD proteins.

1: The biosynthesis of molybdopterin in Escherichia coli. Purification and characterization of the converting factor. Pitterle DM, Rajagopalan KV; J Biol Chem 1993;268:13499-13505. PMID:8514782