equine arterivirus serine peptidase equine arterivirus serine peptidase equine arterivirus serine peptidase (ec 3.4.21.114) is an enzyme. this enzyme catalyses the following chemical reaction cleavage of (glu/gln)-(gly/ser/ala) in arterivirus replicase translation products orf1a and orf1ab equine arterivirus serine peptidaseidentifiersec no.3.4.21.114databasesintenzintenz viewbrendabrenda entryexpasynicezyme viewkeggkegg entrymetacycmetabolic pathwaypriamprofilepdb structuresrcsb pdb pdbe pdbsumsearchpmcarticlespubmedarticlesncbiproteins in the equine arterivirus (eav), the replicase gene is translated into open reading frame 1a (orf1a) and orf1ab s.