Fos and Jun dimerize to form Activator Protein-1 (AP-1), a transcriptional factor that binds to the 12-O-tetradecanoylphorbol 13-acetate (TPA) response element (TRE) of several cellular and viral genes including human collagenase, metallothionein IIa, stromelysin, interleukin 2, SV40 and polyoma. Fos and Jun contain the and quote;leucine-zipper and quote; motif that allows for dimerization and an adjacent basic domain required for biological activity. The functionally active form of Fos is in a heterodimer with a member of the Jun family. While Jun family members can form functional homodimers, studies indicate that Fos family members do not self-associate and therefore do not bind DNA on their own. The various dimers differ in their ability to transactivate AP-1 dependent genes.
Activator protein 1; AH119; AP1; c-Jun; enhancer-binding protein AP1; immediate early; Jun A; Jun activation domain binding protein; Jun oncogene; jun proto-oncogene; p39; Proto-oncogene c-Jun; RJG-9; Transcription factor AP-1; V-jun avian sarcoma virus 17 oncogene homolog; v-jun sarcoma virus 17 oncogene homolog
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