CATALYTIC ACTIVITY: Reaction=glycine + S-adenosyl-L-methionine = H(+) + S-adenosyl-L- homocysteine + sarcosine; Xref=Rhea:RHEA:19937, ChEBI:CHEBI:15378, ChEBI:CHEBI:57305, ChEBI:CHEBI:57433, ChEBI:CHEBI:57856, ChEBI:CHEBI:59789; EC=2.1.1.20; Evidence={ECO:0000256|ARBA:ARBA00033668}; PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:19938; Evidence={ECO:0000256|ARBA:ARBA00033668}; SIMILARITY: Belongs to the class I-like SAM-binding methyltransferase superfamily. Glycine N-methyltransferase family. {ECO:0000256|PIRNR:PIRNR000385}. |