MAT 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). MAIKHLFTSESVSEGHPDKIADQISDAVLDAIFEQDPKARVACETYVKTGMVMVGGEITTSAWVDIEEITRQTVREIGYVHSDMGFDANSCAVLNTIGKQSPDINQGVDKADPKEQGAGDQGIMFGYATNETEVLMPAPITYAHRLMQRQAAVRKNGTLPWLRPDAKSQVTFQYDQGKIVGIDAVVLSTQHSDSISTADLREAVMEEIIKPVLPAEWLSKETKYFINPTGRFVIGGPMGDCGLTGRKIIVDTYGGAARHGGGAFSGKDPSKVDRSAAYAARYVAKNIVAAGMADRCEIQLSYAIGVADPTSIMVETFGTEKVSQEIIIEAVRQFFDLRPYGLQEMLNLLQPIYKKTAAYGHFGREEFPWEATDKAALLRDFAGLK Methionine adenosyltransferase VC_0472 metK METK_VIBCH S-adenosylmethionine synthase 385