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Prospec/IGFBP4 Sf9, Human/Insulin Like Growth Factor Binding Protein-4 Human Recombinant, Sf9/2µg/CYT-1114-2µg
Cataloguenumber
CYT-1114
Synonyms
Insulin-likegrowthfactor-bindingprotein4,IBP-4,IGF-bindingprotein4,IGFBP-4,IGFBP4,IBP4,BP-4,HT29-IGFBP.
Introduction
Insulin-likegrowthfactor-bindingprotein4(IGFBP-4)isapartoftheinsulin-likegrowthfactorbindingprotein(IGFBP)family.IGFBP4includesanIGFBPdomainandathyroglobulintype-Idomain.IGFBP4bindsbothinsulin-likegrowthfactors(IGFs)IandII.IGFBP-4circulatesintheplasmainbothglycosylatedandnon-glycosylatedforms.IGFBPscaneitherinhibitorenhancetheBIOLOGicalactivitiesofIGF,oractinanIGFindependentmanner.IGFBP-4isconsistentlyinhibitsseveralcancercellsinvivoandinvitro,suggestingthatitmayfunctionasanapoptoticfactor.IGFBP4isproducedbyallcoloncancercells.BindingofIGFBP-4prolongsthehalf-lifeoftheIGFsandchangestheirinteractionwithcellsurfacereceptors.
Description
InsulinLikeGrowthFactorBindingProtein-4HumanRecombinantproducedinSf9Insectcellsisasingle,glycosylatedpolypeptidechaincontaining237aminoacidsandhavingamolecularmassof30kDa.TheIGFBP4ispurifiedbyproprietarychromatographictechniques.
Source
Sf9,Insectcells.
PhysicalAppearance
SterileFilteredWhitelyophilized(freeze-dried)powder.
Formulation
Lyophilizedfroma0.2μmfilteredconcentratedsolutionin20mMTris-HCl,pH8.0and150mMNaCl.
Solubility
ItisrecommendedtoreconstitutethelyophilizedInsulinLikeGrowthFactorBindingProtein-4insterile18MΩ-cmH2Onotlessthan100µg/ml,whichcanthenbefurtherdilutedtootheraqueoussolutions.
StABIlity
LyophilizedIGFBP4althoughstableatroomtemperaturefor3weeks,shouldbestoreddesiccatedbelow-18°C.UponreconstitutionInsulinLikeGrowthFactorBindingProtein-4shouldbestoredat4°Cbetween2-7daysandforfutureusebelow-18°C.
Pleasepreventfreeze-thawcycles.
Purity
Greaterthan97.0%asdeterminedby:(a)AnalysisbyRP-HPLC.(b)AnalysisbySDS-PAGE.
Aminoacidsequence
DEAIHCPPCSEEKLARCRPPVGCEELVREPGCGCCATCALGLGMPCGVYTPRCGSGLRCYPPRGVEKPLHTLMHGQGVCMELAEIEAIQESLQPSDKDEGDHPNNSFSPCSAHDRRCLQKHFAKIRDRSTSGGKMKVNGAPREDARPVPQGSCQSELHRALERLAASQSRTHEDLYIIPIPNCDRNGNFHPKQCHPALDGQRGKCWCVDRKTGVKLPGGLEPKGELDCHQLADSFRE.
BiologicalActivity
TheED50isdeterminedbyitsabilitytoinhibitIGF-IIinducedproliferationofMCF-7cellsandis<than0.1μg/ml,correspondingtoaspecificactivityof>1.0×104IU/mginthepresenceof14ng/mlofrHuIGF-II.
SafetyDataSheet
SDS