Tripartite motif-containing protein 28 (TRIM28)

Tripartite motif-containing protein 28 (TRIM28), also known as KRAB-associated protein 1 (KAP1) or transcription intermediary factor 1-beta (TIF1-beta), is a multifunctional nuclear corepressor and chromatin regulator that interacts with the KRAB domain of zinc finger transcription factors to drive transcriptional silencing and heterochromatin formation[1][2]. TRIM28's structure includes a tripartite motif (RING finger, B-boxes, coiled-coil) characteristic of the TRIM family, as well as domains for interaction with heterochromatin protein 1 (HP1) and a bromodomain which recognizes acetylated lysine residues[2]. It plays critical roles in epigenetic silencing of endogenous retroviral elements, maintenance of genome integrity (notably in DNA double-strand break repair), and regulation of 3D chromatin architecture, notably in T cell activation and differentiation[3]. TRIM28 is essential for embryonic development and regulates genes involved in cell proliferation, survival, and immune responses such as suppression of viral gene expression. Aberrations in TRIM28 function or expression are linked to cancer progression, neurodegenerative disorders, viral infections, inflammation, and metabolism-related diseases[1][2][3][4]. As a consequence, it is an important, though challenging, candidate for therapeutic targeting in oncology, immunology, and virology.

Other names

KRAB-associated protein 1KAP-1Transcription intermediary factor 1-betaTIF1-betaKAP1KRIP-1RING finger protein 96RNF96E3 SUMO-protein ligase TRIM28Protein phosphatase 1, regulatory subunit 157Nuclear corepressor KAP-1

No approved drugs directly target TRIM28, so this entry is currently null. Mechanistically, potential future agents might block corepressor functions, modulate SUMOylation/E3 ligase activity, or disrupt protein–protein interactions relevant to chromatin remodeling or retroelement silencing.