TRIP12
Function
E3 ubiquitin-protein ligase involved in ubiquitin fusion degradation (UFD) pathway and regulation of DNA repair (PubMed:19028681, PubMed:22884692). Part of the ubiquitin fusion degradation (UFD) pathway, a process that mediates ubiquitination of protein at their N-terminus, regardless of the presence of lysine residues in target proteins (PubMed:19028681). Acts as a key regulator of DNA damage response by acting as a suppressor of RNF168, an E3 ubiquitin-protein ligase that promotes accumulation of 'Lys-63'-linked histone H2A and H2AX at DNA damage sites, thereby acting as a guard against excessive spreading of ubiquitinated chromatin at damaged chromosomes (PubMed:22884692). In normal cells, mediates ubiquitination and degradation of isoform p19ARF/ARF of CDKN2A, a lysine-less tumor suppressor required for p53/TP53 activation under oncogenic stress (PubMed:20208519). In cancer cells, however, isoform p19ARF/ARF and TRIP12 are located in different cell compartments, preventing isoform p19ARF/ARF ubiquitination and degradation (PubMed:20208519). Does not mediate ubiquitination of isoform p16-INK4a of CDKN2A (PubMed:20208519). Also catalyzes ubiquitination of NAE1 and SMARCE1, leading to their degradation (PubMed:18627766). Ubiquitination and degradation of target proteins is regulated by interaction with proteins such as MYC, TRADD or SMARCC1, which disrupt the interaction between TRIP12 and target proteins (PubMed:20829358). Mediates ubiquitination of ASXL1: following binding to N(6)-methyladenosine methylated DNA, ASXL1 is ubiquitinated by TRIP12, leading to its degradation and subsequent inactivation of the PR-DUB complex (PubMed:30982744).
Involvement in disease
Clark-Baraitser syndrome
CLABARS
An autosomal dominant disease characterized by intellectual disability, delayed psychomotor development, behavioral abnormalities, variable dysmorphic facial features, tall stature, obesity, and macrocephaly.
None
The disease is caused by variants affecting the gene represented in this entry.
Pathway
Protein modification; protein ubiquitination.
Sequence Similarities
Belongs to the UPL family. K-HECT subfamily.
Cellular localization
- Nucleus
- Nucleoplasm
Alternative names
KIAA0045, ULF, TRIP12, E3 ubiquitin-protein ligase TRIP12, E3 ubiquitin-protein ligase for Arf, HECT-type E3 ubiquitin transferase TRIP12, Thyroid receptor-interacting protein 12, TR-interacting protein 12, TRIP-12