ThehumanCNDP2geneencodescytosolnonspecificdipeptidase,amemberoftheM20familyofmetalloproteases(2,3).Alsoknownasglutamatecarboxypeptidase-likeprotein1(CPGL),tissuecarnosinaseorpeptidaseA,CNDP2isubiquitouslyexpressedthroughouthumantissues.UnlikeCNDP1,CNDP2hasbroadsubstratespecificityfordipeptideswithfreeaminoandcarboxylgroups.||Source:|RecombinanthumancytosolicnonspecificdipeptidaseencodedbytheCNDP2gene(humanCNDP2,residue1-475;Accession#Q96KP4)(1,2)wasexpressedwithaC-terminal10XHistaginSf21insectcells.||MolecularMass:|ThepurifiedrhCNDP2migratesasthreebandsinSDS-PAGEwithmolecularmassesofapproximately54,38and22kD.The54kDbandcorrespondstothefull-lengthprotein(485aminoacids).The38and22kDbandscorrespondtotheN-andC-terminalfragments,respectively.TheN-terminalsequencingofrhCNDP2revealedonlyS299HKKDILMHR,whichcorrespondstotheN-terminusofthe22kDfragment.||EndotoxinLevel:|<1.0EUper1μgoftheproteinasdeterminedbytheLALmethod.||Activity:|MeasurebyitsABIlitytocleavecarnosine(β-Ala-His)inatwo-stepassay.SeeActivityAssayprotocolonnextpagefordetails.Thespecificactivity,asmeasuredusingtheprocedureabove,is>70pmoles/min/μg.||Storage:|Samplesarestableforuptosixmonthsat-70°Cinamanualdefrostfreezerafterthereceipt.Afterreceiving,thisenzymecanbealiquotedandstoredundertheabovetemperatureforsixmonthswithoutasignificantlossofactivity.Avoidrepeatedfreeze-thawcycles.

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