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Glycolipid Binding Assay


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Source:ContributedbyPingsunjim,Paller’sLab
Abstract:Thisprotocolcanbeusedforthedetectionofglycolipidsbindingtoimmunoprecipitedprotein.

Procedure

A:Preparationofthecelllysate

    1. Rinsea60mmculturedishofconfluentcellswith10mMTris-HCl,PH7.4,0.15MNaCl,1mMMnCl2,and0.2mMPMSF.
    2. Lysethecellswith0.5mlcoldbuffer(10mMTris-HCl,PH7.4,0.15MNaCl,1mMMnCl2,3mMPMSF,and0.1MOctylglucoside)
    3. Maintainconstantagitationfor20minutesat4oC.
    4. Scrapethecellsfromthedishandcentrifuge(16,000xg,4oC)for15minutes,thesupernatantisthe"totalcelllysate".

B:Immunoprecipitation

    1. Add4µgofantibody,400µlofH2O,400µgtotalproteintomicrocentrifugetube.
    2. Vortexandincubateat4celsiusdegreefor1Hr.
    3. Add10µl50%proteinA:Agrose,vortexandincubatefor30minutesat4oC.
    4. Centrifugetheagarosesolutionfor5minutes(16,000xg,4oC)anddiscardthesupernatant.
    5. Washwithlysisbuffer,bycentrifuging5minutes(16,000xg,4oC),repeatwashtwice.

C:Thecrosslinkingofganglioside

    1. Add200-400µl50-100uMganglioside(dilutedinPBSfrom5mMinDMSOstockingsolution)tomicrocentrifugetube.
    2. Add2.5x10,000particlesof1uMFluospherebeads.
    3. Mixovernightat4oCwith200µl5mg/ml1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide.
    4. WashwithPBS,bycentrifuging,repeatwash3times.
    5. ResUSPendthebeadinPBSsolution.

D:Thedetectionofproteinandgangliosidesbinding

    1. Add5-10µlFluoro-beadtomicrocentrifugetubewithimmunoprecipitatedprotein.
    2. incubate1Hratroomtemperature.
    3. WashwithPBSorlysisbufferfor3times.
    4. MonitorbyFluoro-microscope.