| Primary Identifier | IPR042713 | Type | Domain |
| Short Name | TIF1beta_RING-HC |
| description | TIF1-beta, also known as Kruppel-associated Box (KRAB)-associated protein 1 (KAP-1), belongs to the C-VI subclass of TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as a plant homeodomain (PHD), and a bromodomain (Bromo) positioned C-terminal to the RBCC domain. It acts as a nuclear co-repressor that plays a role in transcription and in the DNA damage response [, , ]. Upon DNA damage, the phosphorylation of KAP-1 on serine 824 by the ataxia telangiectasia-mutated (ATM) kinase enhances cell survival and facilitates chromatin relaxation and heterochromatic DNA repair []. It also regulates CHD3 nucleosome remodelling during the DNA double-strand break (DSB) response []. Meanwhile, KAP-1 can be dephosphorylated by protein phosphatase PP4C in the DNA damage response []. Moreover, KAP-1 is a co-activator of the orphan nuclear receptor NGFI-B (or Nur77) and is involved in NGFI-B-dependent transcription []. It is also a coiled-coil binding partner, substrate and activator of the c-Fes protein tyrosine kinase []. The N-terminal RBCC domains of TIF1-beta are responsible for the interaction with KRAB zinc finger proteins (KRAB-ZFPs), MDM2, MM1, C/EBPbeta, and the regulation of homo- and heterodimerization []. The C-terminal PHD/Bromo domains are involved in interacting with SETDB1, Mi-2alpha and other proteins to form complexes with histone deacetylase or methyltransferase activity [, ].This entry represents the RING-HC finger found in TIF1-beta. |
