Transforming growth factor beta-1-induced transcript 1 protein (TGFB1I1)

Transforming growth factor beta-1-induced transcript 1 protein (TGFB1I1) is a multi-functional adapter and coactivator protein, encoded by the TGFB1I1 gene in humans. Its expression is induced by transforming growth factor beta-1 (TGFB1) and hydrogen peroxide. It is predominantly localized at the focal adhesion complexes, but also shuttles between the cytoplasm and nucleus. TGFB1I1 functions as a scaffold at focal adhesions, coordinates protein-protein interactions, and acts as a nuclear coactivator for several hormone receptors, including androgen and glucocorticoid receptors. These activities allow TGFB1I1 to regulate signal transduction, cellular proliferation, migration, differentiation, and senescence. Its involvement in cancer (including prostate cancer) and its role as an androgen receptor coactivator highlight its therapeutic relevance[1][2][8].

Other names

HIC-5 (Hydrogen peroxide-inducible clone 5)ARA55 (Androgen receptor coactivator 55 kDa protein)TSC-5Androgen receptor-associated protein of 55 kDaHydrogen peroxide-inducible clone-5HIC5TGFI1 protein

No specific mechanism is defined for drugs binding directly to TGFB1I1, but drugs modulating androgen receptor activity could alter TGFB1I1’s coactivator function, impacting AR signaling and downstream transcriptional outcomes[2].