Enables ATP binding activity; amino acid binding activity; and methionine adenosyltransferase activity. Involved in several processes, including S-adenosylmethionine biosynthetic process; circadian rhythm; and response to cAMP. Located in cytosol. Orthologous to human MAT2A (methionine adenosyltransferase 2A). [provided by Alliance of Genome Resources, Apr 2022]