peptidyl-dipeptidase b peptidyl-dipeptidase b peptidyl-dipeptidase b (ec 3.4.15.4, dipeptidyl carboxyhydrolase, atriopeptin convertase, atrial di-(tri)peptidyl carboxyhydrolase, peptidyldipeptidase b, atrial dipeptidyl carboxyhydrolase, atrial peptide convertase) is an enzyme. it catalyses the following chemical reaction release of a c-terminal dipeptide or exceptionally a tripeptide peptidyl-dipeptidase bidentifiersec no.3.4.15.4cas no.147014-93-5 databasesintenzintenz viewbrendabrenda entryexpasynicezyme viewkeggkegg entrymetacycmetabolic pathwaypriamprofilepdb structuresrcsb pdb pdbe pdbsumsearchpmcarticlespubmedarticlesncbiproteins this membrane-bound, zinc metallopeptidase is located in mammalian atrial myocytes.