Enables glycine N-methyltransferase activity and glycine binding activity. Involved in S-adenosylmethionine metabolic process and protein homotetramerization. Acts upstream of or within several processes, including glycogen metabolic process; one-carbon metabolic process; and regulation of gluconeogenesis. Predicted to be located in nucleus. Predicted to be part of methyltransferase complex. Predicted to be active in cytosol. Is expressed in several structures, including integumental system; limb; nose; pancreas tip epithelium; and skeleton. Used to study glycine N-methyltransferase deficiency and hepatocellular carcinoma. Human ortholog(s) of this gene implicated in glycine N-methyltransferase deficiency. Orthologous to human GNMT (glycine N-methyltransferase). [provided by Alliance of Genome Resources, Apr 2022]