UniProtSummary | FUNCTION:SwissProt:P46531#Functionsasareceptorformembrane-boundligandsJagged1,Jagged2andDelta1toregulatecell-fatedetermination.Uponligandactivationthroughthereleasednotchintracellulardomain(NICD)itformsatranscriptionalactivatorcomplexwithRBP-Jkappaandactivatesgenesoftheenhancerofsplitlocus.Affectstheimplementationofdifferentiation,proliferationandapoptoticprograms.Maybeimportantfornormallymphocytefunction.Inalteredform,maycontributetotransformationorprogressioninsomeT-cellneoplasms.InvolvedinthematurationofbothCD4+andCD8+cellsinthethymus.MaybeimportantforfolliculardifferentiationandpossIBLycellfateselectionwithinthefollicle.Duringcerebellardevelopment,mayfunctionasareceptorforneuronalDNERandmaybeinvolvedinthedifferentiationofBergmannglia(Bysimilarity).
SIZE:2556aminoacids;272500Da
SUBUNIT:HeterodimerofaC-terminalfragmentN(TM)andanN-terminalfragmentN(EC)whichareprobablylinkedbydisulfidebonds.InteractswithDNER,DTX1,DTX2andRBPSUH.AlsointeractswithMAML1,MAML2andMAML3whichactastranscriptionalcoactivatorsforNOTCH1.
SUBCELLULARLOCATION:Cellmembrane;Single-passtypeImembraneprotein(Bysimilarity).&Notch1intracellulardomain:Nucleus(Bysimilarity).Note=FollowingproteolyticalprocessingNICDistranslocatedtothenucleus(Bysimilarity).
TISSUESPECIFICITY:Infetaltissuesmostabundantinspleen,brainstemandlung.Alsopresentinmostadulttissueswhereitisfoundmainlyinlymphoidtissues.
PTM:Synthesizedintheendoplasmicreticulumasaninactiveformwhichisproteolyticallycleavedbyafurin-likeconvertaseinthetrans-Golginetworkbeforeitreachestheplasmamembranetoyieldanactive,ligand-accessibleform.CleavageresultsinaC-terminalfragmentN(TM)andaN-terminalfragmentN(EC).Followingligandbinding,itiscleavedbyTNF-alphaconvertingenzyme(TACE)toyieldamembrane-associatedintermediatefragmentcallednotchextracellulartruncation(NEXT).Thisfragmentisthencleavedbypresenilindependentgamma-secretasetoreleaseanotch-derivedpeptidecontainingtheintracellulardomain(NICD)fromthemembrane(Bysimilarity).&Phosphorylated(Bysimilarity).
DISEASE:SwissProt:P46531#NOTCH1truncationisassociatedwithT-cellacutelymphoblasticleukemia.&DefectsinNOTCH1areacauseofaorticvalvedisease[MIM:109730].Thedisorderconsistsofanearlydevelopmentaldefectintheaorticvalveandalaterde-repressionofcalciumdepositionthatcausesprogressiveaorticvalvedisease.CalcificationoftheaorticvalveisthethirdleADIngcauseofheartdiseaseinadults.Theincidenceincreaseswithage,anditisoftenassociatedwithabicUSPidaorticvalvepresentin1-2%ofthepopulation.
SIMILARITY:SwissProt:P46531##BelongstotheNOTCHfamily.&Contains5ANKrepeats.&Contains36EGF-likedomains.&Contains3LNR(Lin/Notch)repeats. |