Activator protein-1 transcription factor subunit Jun (JUN)

Activator protein-1 (AP-1) is a dimeric transcription factor complex primarily formed by proteins of the JUN (e.g., c-Jun, JunB, JunD) and FOS (e.g., c-Fos, FosB, Fra-1, Fra-2) families that share a basic-region leucine zipper (bZIP) domain, enabling specific DNA binding and dimerization. The AP-1 transcription factor regulates numerous genes involved in cell proliferation, differentiation, apoptosis, and response to stress. c-Jun is a major component of AP-1 and can form homodimers or heterodimers (most often with FOS family proteins), which then bind DNA at consensus response elements to regulate expression of target genes. Aberrant AP-1/JUN activity is implicated in oncogenesis, cancer progression, inflammation, and cardiovascular disease. Therapeutic modulation of AP-1/JUN is of interest for cancer and chronic inflammatory conditions, but such interventions face significant challenges due to the pleiotropic and context-dependent nature of AP-1 functions in normal and pathological processes[1][2][3][5].

Other names

AP-1 (when referring to the dimeric complex)c-JunJunJun proto-oncogeneJun/AP-1JUN (gene/protein)Transcription factor AP-1 subunit Jun

Inhibition of AP-1/JUN DNA binding (prevents recruitment to target gene promoters); Suppression of JUN/FOS dimer formation; Downregulation of c-Jun/JUN expression or protein stability; Inhibition of upstream kinases (e.g., JNK) that phosphorylate and activate JUN