p-c-JunThr91+Thr93, p-JunThr91+Thr93, Jun oncogene, JUN, Activator Protein 1, AP 1, AP1, AP-1, Enhancer Binding Protein AP1, Jun Activation Domain Binding Protein, JUN protein, JUNC, p39, Proto oncogene cJun, Transcription Factor AP1, V jun avian sarcoma virus 17 oncogene homolog, vJun Avian Sarcoma Virus 17 Oncogene Homolog, JUN_HUMAN, Transcription factor AP-1, Activator 1, Proto-oncogene c-Jun, V-jun avian sarcoma virus 17 oncogene homolog.
C-jun (Oncoprotein C-jun) is a component of the transcription factor AP-1 that binds and activates transcription at TRE/AP-1 elements and appears to be a major downstream target of the SAPK/JNK signaling pathway. The transcriptional activity of c-Jun is regulated by phosphorylation at Ser63 and Ser73. Extracellular signals including growth factors, transforming oncoproteins and UV irradiation stimulate phosphorylation of c-Jun at Ser63/73 and activate c-Jun dependent transcription. Mutation of Ser63/73 renders c-Jun nonresponsive to mitogenic and stress induced signaling pathways. The MAP kinase homologue, SAPK/JNK, binds to the N-terminal region of c-Jun and phosphorylates c-Jun at Ser63/73. In addition, the activity of SAPK/JNK is stimulated by the same signals that activate c-Jun.
