c-JunisacomponentofthetranscriptionfactorAP-1,whichbindsandactivatestranscriptionatTRE/AP-1elements.Thetranscriptionalactivityofc-JunisregulatedbyphosphorylationatSer63andSer73(1,2).Extracellularsignalsincludinggrowthfactors,transformingoncoproteinsandUVirrADIationstimulatephosphorylationofc-JunatSer63/73andactivatec-Jun-dependenttranscription.MutationofSer63/73rendersc-Junnonresponsivetomitogenicandstress-inducedsignalingpathways.TheMAPkinasehomologueSAPK/JNKbindstotheamino-terminalregionofc-Junandphosphorylatesc-JunatSer63/73.Inaddition,theactivityofSAPK/JNKisstimulatedbythesamesignalsthatactivatec-Jun(3,4).
c-Junalso playsaroleinNeuropathicPain.
Image:Detectionofc-JunwithSP15102.LysatesfromhumanHeLa(1),K562(2),andMDA-MB-468(3)cellswereresolvedbySDS-PAGE,transferredtoImmobilon-Pmembrane,andimmunoblottedwith0.5ug/mLsheepanti-c-jun. A1minuteexposuretofilmisshown.Bandforc-Junis~40KDa.
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