| Formulation | H2O |
| MolecularWeight | |
| Storage | -80°C |
| Purity | HPLCandTLCanalysis |
| Compound | |
| Assay | N/A |
| ShelfLife(properlystored) | 12months |
| ChemicalFormula | |
ThestructureofdansylarginineN-(3-ethyl-1,5-pentanediyl)amide(DAPA)isillustrated.DAPAisapotentinhibitorofthrombinwhichexhibitsuniquechangesinitsfluorescentpropertieswhenboundtothrombin.
Overview:
DansylarginineN-(3-ethyl-1,5-pentanediyl)amide,morecommonlyreferredtoasDAPA,isapotent(Ki=10-7M)andspecificsyntheticthrombininhibitor(1).OfspecialinterestaretheuniquefluorescentpropertiescontributedbythedansylmoietyofDAPA.Whenboundtothrombin,thefluorescenceintensityandlifetimeofthedansylmoietyareincreasedthreefold.Theenhancementoffluorescenceintensity,coupledwithitsinhibitoryproperties,havemadethiscompoundextremelyusefulforstudiesinvolvingthrombingeneration(2-7).Inadditiontoanincreaseinfluorescenceintensityandlifetime,thereisadecreaseindepolarizationoftheexcitationsignalwhichalsosupportsfluorescencepolarizationstudies.
TheinhibitorpropertiesofDAPAalonehavebeenusefulinavarietyofapplications.DAPAisroutinelyusedasaproteaseinhibitorduringtheisolationofproteinsthataresusceptIBLetothrombincleavage.FurThermore,byeliminatingthefeedbackofthrombinactivityduringprothrombinactivation,theisolationofreactionintermediatessuchasfragment1.2,andmeizothrombinhavebeenmadepossible(7).
DAPAissynthesizedaccordingtheproceduredescribedbyNesheim,etal.(1).HPLC,TLCandspectralanalysesareusedtodeterminethepurityofthefinalproduct.DAPAissuppliedinwater.Whenproperlystoredat-20°Candprotectedfromlight,thecompoundisstableformanyyears.
Properties:
| Formula | C25H39O3N6S1Cl1(reference#1) DansylarginineN-(3-ethyl-1,5-pentanediyl)amide | |||||
|---|---|---|---|---|---|---|
| Molecularweight | 539g/mole(1) | |||||
| Extinctioncoefficient |
| |||||
| Specialproperties | Aspecificandpotentthrombininhibitor(Ki=10-7M).Exhibitsa3-foldincreaseinfluorescenceintensityandlifetimewhenboundtothrombin. |
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本人目前需从电鳗放电器官中提取乙酰胆碱受体蛋白,提纯需要的步骤和电鳗器官都可以提供,有没有提供外包提纯服务的公司或者实验室。
算上其他生物24种
大概是记不太清了
NaturalProteinStopsDeadlyHumanBrainCancerInMice
ScientistsfromJohnsHopkinsandfromtheUniversityofMilanhaveeffectivelyproventhattheycaninhibitlethalhumanbraincancersinmiceusingaproteinthatselectivelyinducespositivechangesintheactivityofcellsthatbehavelikecancerstemcells.ThereportispublishedinNature.
Themostcommontypeofbraincancer-glioblastoma-ismarkedbythepresenceofthesestem-cell-likebraincells,which,insteadoftriggeringthereplacementofdamagedcells,formcancertissue.Stemcells,unlikeallothercellsinthebody,arecapableofformingalmostanykindofcellwhentheright"signals"triggertheirdevelopment.
Fortheirtreatmentexperiment,theresearchersreliedonaclassofproteins,bonemorphogenicproteins,thatcauseneuralstem-cell-likeclusterstolosetheirstemcellproperties,whichinturnstopstheirABIlitytodivide.
Firsttheypretreatedhumanglioblastomacellswithbonemorphogenicprotein4(BMP4),theninjectedthesetreatedcellsintomousebrains.Inmiceinjectedwithcellsthatwerenotpretreated,large,invasivecancersgrew.InthemicewithBMP4-treatedcells,nocancersgrewatall.Threetofourmonthsafterinjection,allmicethatgotuntreatedcellsdied,andnearlyallmicewithBMP4-treatedcellswerealive.
Next,thescientistsdeliveredslow-releaseBMP4-containing"beads"directlyintomousebrainswithimplantedglioblastomacells.Micethatgotemptybeadsdevelopedlargemalignanttumorsanddied.MicewithBMP4beadssurvivedmuchlonger,and80percentsurvivedfourmonthsaftercancercellimplants.
"OurideaistotreatpatientswithBMP4orsomethinglikeitrightaftersurgerytoremoveglioblastomainhopesofpreventingtheregrowthofthecancerandimprovingsurvivaltime,"saysAlessandroOlivi,M.D.,directoroftheDivisionofNeurosurgicalOncologyatHopkinsandacontributortothestudy.
OlivisaysclinicalstudiesusingBMP4couldbeginwithinayearand,ifsuccessful,drugtherapiescouldbeavailabletothepublicwithinthreetofouryears.
"ThiswasproofoftheideathatBMPscouldstopglioblastomabydepletingthestem-cell-likepopulationthatfeedsit,"saysHenryBrem,M.D.,chairmanoftheDepartmentofNeurosurgeryatHopkinsandacollaboratorinthestudy."Thisopensexcitingdoorstofutureresearchintotreatmentsandtherapiesforsuchadevastatingdisease."

