| UniProtSummary | FUNCTION:SwissProt:Q96SB3#Seemstoactasascaffoldproteininmultiplesignalingpathways.Modulatesexcitatorysynaptictransmissionanddendriticspinemorphology.Bindstoactinfilaments(F-actin)andshowscross-linkingactivity.BindsalongthesidesoftheF-actin.MayplayanimportantroleinlinkingtheactinCytoskeletontotheplasmamembraneatthesynapticjunction.Believedtotargetproteinphosphatase1/PP1todendriticspines,whicharerichinF-actin,andregulatesitsspecificitytowardionchannelsandothersubstrates,suchasAMPA-typeandNMDA-typeglutamatereceptors.PlaysaroleinregulationofG-proteincoupledreceptorsignaling,includingdopamineD2receptorsandalpha-adrenergicreceptors.MayestablishasignalingcomplexfordopaminergicneurotransmissionthroughD2receptorsbylinkingreceptorsdownstreamsignalingmoleculesandtheactincytoskeleton.BindstoADRA1BandRGS2andmediatesregulationofADRA1Bsignaling.MayconfertoRacsignalingspecificitybybindingtoboth,RacGEFsandRaceffectorproteins.Probablyregulatesp70S6kinaseactivitybyformingacomplexwithTIAM1(Bysimilarity). 
 
 SIZE:815aminoacids;89192Da
 
 SUBUNIT:PossIBLyexistsasanhomodimer,homotrimeroranhomotetramer.InteractswithF-actin,PPP1CA,neurabin-1,TGN38andD(2)dopaminereceptor.InteractswithRGS1,RGS2,RGS4,RGS19andADRA1B,ADRA2A,ADRA2B,ADRA2C,CDKN2A,PPP1R2,RASGFR1andTIAM1.
 
 SUBCELLULARLOCATION:Cytoplasm(Bysimilarity).Nucleus(Bysimilarity).Cellprojection,dendriticspine(Bysimilarity).Celljunction,synapse.Note=Enrichedatsynapseandcadherin-basedcell-celladhesionsites.Inneurons,bothcytosolicandmembrane-associated,andhighlyenrichedinthepost-synapticdensityapposedtoexitatorysynapses.ColocalizeswithPPP1R2atactin-richadherensjunctionsinepithelialcellsandindendriticspines(Bysimilarity).
 
 
 
 
 PTM:StimulationofD1(butnotD2)dopaminereceptorsinducesSer-94phosphorylation.DephosphorylationofSer-94ismediatedmainlybyPP1andtoalesserextentbyPP2A.PhosphorylationofspinophilindisruptsitsassociationwithF-actin,butdoesnotaffectitsbindingtoPP1(Bysimilarity).
 
 
 SIMILARITY:SwissProt:Q96SB3##Contains1PDZ(DHR)domain.
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