Peroxiredoxin(Prx)isagrowingperoxidasefamily,whosemammalianmembershavebeenknowntoconnectwithcellproliferation,differentiation,andapoptosis.Manyisoforms(about50proteins),collectedinaccordancetotheaasequencehomology,particularlyamino-terminalregioncontainingactivesitecysteineresidue,andthethiol-specificantioxidantactivity,distributethroughoutallthekingdoms.Amongthem,mammalianPrxconsistsof6differentmembersgroupedintotypical2-Cys,atypical2-CysPrx,and1-CysPrx.ExceptPrxVIbelongingto1-CysPrxsubgroup,theotherfive2-CysPrxisotypeshavethethioredoxin-dependentperoxidase(TPx)activityutilizingthioredoxin,thioredoxinreductase,andNADPHasareducingsystem.MammalianPrxsare20-30kDinmolecularsizeandvaryinsubcellularlocalization:PrxI,II,andVIincytosol,PrxIIIinmitochondria,PrxIVinERandsecretion,PrxVshowingcomplicateddistributionincludingperoxisome,mitochondriaandcytosol(1).||Source:|Recombinantcorrespondingtoaa63-256,withoutmitochondrialleadersequence,fromhumanPeroxiredoxin3,expressedinE.coli.||MolecularWeight:|~21.6kD||SpecificActivity:|1.2U/mg(Oneunitwillcausetheoxidationof1umoleofNADPHat25°CatpH7.5)||StorageandStABIlity:|Aliquottoavoidrepeatedfreezingandthawingandstoreat-70°C.Formaximumrecoveryofproduct,centrifugetheoriginalvialafterthawingandpriortoremovingthecap.

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