Tetrahydrosarcinapterin synthase (, H4MPT:alpha-L-glutamate ligase, MJ0620, MptN protein) is an enzyme with systematic name tetrahydromethanopterin:alpha-L-glutamate ligase (ADP-forming). This enzyme catalyses the following chemical reaction
This enzyme catalyses the biosynthesis of 5,6,7,8-tetrahydrosarcinapterin.