UniProtSummary | FUNCTION:SwissProt:P06400#Keyregulatorofentryintocelldivisionthatactsasatumorsuppressor.Directlyinvolvedinheterochromatinformationbymaintainingoverallchromatinstructureand,inparticular,thatofconstitutiveheterochromatinbystabilizinghistonemethylation.RecruitsandtargetshistonemethyltransferasesSUV39H1,SUV420H1andSUV420H2,leADIngtoepigenetictranscriptionalrepression.ControlshistoneH4"Lys-20"trimethylation.AlsoactsasatranscriptionrepressorofE2Ftargetgenesbyrecruitingchromatin-modifyingenzymestopromoters.InhibitstheintrinsickinaseactivityofTAF1.FormsacomplexwithadenovirusE1AandwithSV40largeTantigen.MaybindandmodulatefunctionallycertaincellularproteinswithwhichTandE1Acompeteforpocketbinding. SIZE:928aminoacids;106159Da SUBUNIT:InteractspreferentiallywithtranscriptionfactorE2F1.TheunphosphorylatedforminteractswithARID3B,JARID1A,SUV39H1,MJD2A/JHDM3AandTHOC1.InteractswiththeN-terminaldomainofTAF1.InteractswithAATF,DNMT1,LIN9,LMNA,SUV420H1,SUV420H2,PELP1andTMPO-alpha.MayinteractwithKNTC2.InteractswithEID1andZUBR1.InteractswithARID4AandJARID1B. SUBCELLULARLOCATION:Nucleus. TISSUESPECIFICITY:Expressedintheretina. PTM:PhosphorylatedfromStoMphaseofthecellcycleandisdephosphorylatedinG1.T,butnotE1A,bindsonlytotheunphosphorylatedform. DISEASE:SwissProt:P06400#DefectsinRB1arethecauseofchildhoodcancerretinoblastoma(RB)[MIM:180200].RBisacongenitalmalignanttumorthatarisesfromthenuclearlayersoftheretina.Itoccursinabout1:20"000livebirthsandrepresentsabout2%ofchildhoodmalignancies.Itisbilateralinabout30%ofcases.AlthoughmostRBappearsporadically,about20%aretransmittedasanautosomaldominanttraitwithincompletepenetrance.Thediagnosisisusuallymadebeforetheageof2yearswhenstrabismusoragraytoyellowreflexfrompupil(cateye)isinvestigated.&DefectsinRB1areacauseofbladdercancer[MIM:109800].&DefectsinRB1areacauseofosteogenicsarcoma[MIM:259500]. SIMILARITY:SwissProt:P06400##Belongstotheretinoblastomaprotein(RB)family. |