E3 ubiquitin-protein ligase tripartite motif-containing protein 33 (TRIM33)

E3 ubiquitin-protein ligase tripartite motif-containing protein 33 (TRIM33) is a multifunctional protein encoded by the TRIM33 gene, member of the tripartite motif (TRIM) family. It is characterized by a RING domain, B-boxes, and coiled-coil region (N-terminus), and plant homeodomain (PHD) and Bromo domains (C-terminus). TRIM33 acts as an E3 ubiquitin ligase, facilitating proteasomal degradation of substrate proteins such as p53 via K48-linked polyubiquitination. It regulates transcription through interactions with SMAD2/3/4 and chromatin, is dynamically recruited during PARP-dependent DNA damage response and modulates chromatin conformations. TRIM33 plays critical roles in differentiation and maintenance of hematopoietic, immune (dendritic), and osteogenic cell lineages. It is implicated as both a tumor suppressor and oncogene in distinct cancer contexts. Abnormal TRIM33 expression disrupts glycolysis, immune homeostasis, and cell survival, and is associated with diverse human diseases, making it a promising—yet complex—therapeutic target[1][2][3][4][5].

Other names

TRIM33TIF1-gammaTIF1GKIAA1113RFG7PTC7Ectodermin homologRET-fused gene 7 proteinTranscription intermediary factor 1-gammaTIF1GAMMAFLJ11429ECTOTF1GTIFGAMMAProtein Rfg7

Proteasome inhibitors may counteract TRIM33-mediated p53 degradation, potentially restoring p53 function in cancer cells. E3 ligase modulators (general), potential development for targeted degradation therapies.