S-adenosyl-L-methionine transmembrane transporter activity L-amino acid transmembrane transporter activity purine nucleoside transmembrane transporter activity antiporter activity modified amino acid transmembrane transporter activity S-adenosyl-L-methionine:S-adenosyl-L-homocysteine antiporter activity https://github.com/geneontology/go-ontology/issues/24887 https://github.com/geneontology/go-ontology/issues/30193 RHEA:75479 GO:0180003 molecular_function Catalysis of the reaction: S-adenosyl-L-homocysteine(out) + S-adenosyl-L-methionine(in) = S-adenosyl-L-homocysteine(in) + S-adenosyl-L-methionine(out). 2023-02-10T13:06:12Z vw