
Cataloguenumber
CYT-1131
Synonyms
Introduction
ClusterinalsonamedApolipoproteinJisa75-80kDdisulfide-linkedheterodimericproteincontainingabout30%ofN-linkedcarbohydraterichinsialicacidbuttruncatedformstargetedtothenucleushavealsobeenidentified.Theprecursorpolypeptidechainiscleavedproteolyticallytoremovethe22-mersecretorysignalpeptideandsubsequentlybetweenresidues227/228togeneratetheaandbchains.Theseareassembledinanti-paralleltogiveaheterodimericmoleculeinwhichthecysteine-richcentersarelinkedby5disulfidebridgesandareflankedby2predictedcoiled-coila-helicesandthreepredictedamphipathica-helices.Acrossawiderangeofspeciesclusterinshowsahighdegreeofsequencehomologyrangingfrom70%to80%.Itisnearlyubiquitouslyexpressedinmostmammaliantissuesandcanbefoundinplasma,milk,urine,cerebrospinalfluidandsemen.Itisabletobindandformcomplexeswithnumerouspartnerssuchasimmunoglobulins,lipids,heparin,bacteria,complementcomponents,paraoxonase,betaamyloid,leptinandothers.Clusterinhasbeenascribedaplethoraoffunctionssuchasphagocyterecruitment,aggregationinduction,complementattackprevention,apoptosisinhibition,membraneremodeling,lipidtransport,hormonetransportand/orscavenging,matrixmetalloproteinaseinhibition.Clusterinisanextracellularchaperoneprotectingcellsfromstressinducedinsultscausedbydegradedandmisfoldedproteinprecipitates.Clusterinisup-ordownregulatedonthemRNAorproteinlevelinmanypathologicalandclinicallyrelevantsituationsincludingcancer,organregeneration,infection,Alzheimerdisease,retinitispigmentosa,myocardialinfarction,renaltubulardamage,autoimmunityandothers.
Source
HumanSerum.
PhysicalAppearance
Formulation
HumannativeClusterinwasfiltered(0.4μm)andlyophilizedfrom0.5mg/mlinphosphatebuffer,pH7.5and5%(w/v)trehalose.
Solubility
ItisrecommendedtoadddeionizedH2Otoprepareaworkingstocksolutionof0.5mg/mlandletthelyophilizedpelletdissolvecompletely.Productisnotsterile!Pleasefiltertheproductbyanappropriatesterilefilterbeforeusingitinthecellculture.
StABIlity
StorelyophilizedClusterinat-20°C.Aliquottheproductafterreconstitutiontoavoidrepeatedfreezing/thawingcycles.Reconstitutedproteincanbestoredat4°Cforalimitedperiodoftime;itdoesnotshowanychangeaftertwoweeksat4°C.
Purity
Greaterthan90%asdeterminedbySDSPAGE.
SafetyDataSheet
SDS