METK 392 METK_MESCR Catalyzes the formation of S-adenosylmethionine from methionine and ATP. The overall synthetic reaction is composed of two sequential steps, AdoMet formation and the subsequent tripolyphosphate hydrolysis which occurs prior to release of AdoMet from the enzyme (By similarity). MDTFLFTSESVNEGHPDKLCDQISDAVLDACLAQDAESKVACETCTKTNLVMVFGEITTKANVDYEKIARDTCRNIGFVSDDVGLDADNCKVLVYIEQQSPDIAQGVHGHLTKRPEEIGAGDQGHMFGYATDETPELMPLSHVLATKLGARLTEVRKNGTCPWLRPDGKTQVTVEYYNENGAMVPVRVHTVLISTQHDETVTNDEIAADLKEHVIKPVIPEKYLDEKTIFHLNPSGRFVIGGPHGDAGLTGRKIIIDTYGGWGAHGGGAFSGKDPTKVDRSGAYIARQAAKSIVAAGLARRCIVQISYAIGVAEPLSVFVDTYGTGKISDKDILKIVKETFDFRPGMIANNLDLLRGGNRYLKTAAYGHFGRDDADFTWEVVKPLKWEKPQE S-adenosylmethionine synthase Methionine adenosyltransferase