TRIM33

The protein encoded by this gene is thought to be a transcriptional corepressor. However, molecules that interact with this protein have not yet been identified. The protein is a member of the tripartite motif family. This motif includes three zinc-binding domains, a RING, a B-box type 1 and a B-box type 2, and a coiled-coil region. Three alternatively spliced transcript variants for this gene have been described, however, the full-length nature of one variant has not been determined. [provided by RefSeq, Jul 2008]

TRIM33 Gene(Protein Coding) Tripartite Motif Containing 33

Acts as an E3 ubiquitin-protein ligase. Promotes SMAD4 ubiquitination, nuclear exclusion and degradation via the ubiquitin proteasome pathway. According to PubMed:16751102, does not promote a decrease in the level of endogenous SMAD4. May act as a transcriptional repressor. Inhibits the transcriptional response to TGF-beta/BMP signaling cascade. Plays a role in the control of cell proliferation. Its association with SMAD2 and SMAD3 stimulates erythroid differentiation of hematopoietic stem/progenitor (By similarity).
Monoubiquitinates SMAD4 and acts as an inhibitor of SMAD4-dependent TGF-beta/BMP signaling cascade (Monoubiquitination of SMAD4 hampers its ability to form a stable complex with activated SMAD2/3 resulting in inhibition of TGF-beta/BMP signaling cascade).

Biological Process negative regulation of BMP signaling pathway Source:UniProtKB1 Publication
Biological Process negative regulation of DNA-templated transcription Source:UniProtKB1 Publication
Biological Process negative regulation of transcription by RNA polymerase II Source:Reactome
Biological Process protein ubiquitination Source:UniProtKB1 Publication
Biological Process regulation of transforming growth factor beta receptor signaling pathway Source:UniProtKB1 Publication

Nucleus
In discrete nuclear dots resembling nuclear bodies.

A chromosomal aberration involving TRIM33 is found in papillary thyroid carcinomas (PTCs). Translocation t(1;10)(p13;q11) with RET. The translocation generates the TRIM33/RET (PTC7) oncogene.

Sumoylated with SUMO1.