Enables methionine adenosyltransferase activity. Acts upstream of or within S-adenosylmethionine biosynthetic process and cellular response to leukemia inhibitory factor. Predicted to be part of methionine adenosyltransferase complex. Predicted to be active in cytosol. Is expressed in eye; gut; male reproductive gland or organ; metanephros; and nervous system. Orthologous to human MAT2A (methionine adenosyltransferase 2A). [provided by Alliance of Genome Resources, Apr 2022]