| 2012 |
TRIP12 and UBR5, two HECT domain E3 ubiquitin ligases, control accumulation of RNF168 by promoting its degradation via ubiquitylation, thereby limiting spreading of histone ubiquitin conjugates (H2A-Ub) beyond DNA double-strand break sites and preventing hyperaccumulation of 53BP1 and BRCA1 at undamaged chromatin. |
siRNA depletion of TRIP12/UBR5, immunofluorescence of 53BP1/BRCA1/ubiquitin conjugates, western blot for RNF168 levels, DSB-induced focus formation assays |
Cell |
High |
22884692
|
| 2008 |
TRIP12 HECT domain functions as the E3 ubiquitin ligase of the human ubiquitin fusion degradation (UFD) pathway, catalyzing in vitro ubiquitination of UFD substrates (including UBB+1) in conjunction with E1, E2, and E4 enzymes; the HECT domain possesses a noncovalent ubiquitin-binding site required for substrate recognition. |
In vitro ubiquitination assay, siRNA knockdown, cell death assays, cross-linking of HECT domain to ubiquitin moiety in vivo, complementation with HECT domain alone |
The Journal of biological chemistry |
High |
19028681
|
| 2008 |
TRIP12 interacts with APP-BP1 (NEDD8-activating enzyme subunit) specifically as a monomer (not as APP-BP1/Uba3 heterodimer), ubiquitinates it in vitro requiring E4 activity for polyubiquitination, and promotes its proteasomal degradation, thereby modulating neddylation of CUL1. |
Yeast two-hybrid, co-immunoprecipitation, in vitro ubiquitination assay, siRNA knockdown with western blot, neddylation assay of CUL1 |
Biochemical and biophysical research communications |
High |
18627766
|
| 2011 |
The E3 ubiquitin ligase activity of Trip12 is indispensable for mouse embryogenesis; homozygous catalytic inactivation causes embryonic lethality with growth arrest and p16 upregulation; Trip12 targets BAF57 (SWI/SNF component) for degradation and regulates global gene expression. |
Homozygous knock-in mutation disrupting HECT catalytic activity, mouse embryology, ES cell growth and differentiation assays, western blot for BAF57 and p16 |
PloS one |
High |
22028794
|
| 2012 |
HUWE1 and TRIP12 function in parallel (additive stabilization upon double knockdown) during UFD substrate degradation; HUWE1 associates with both the UFD substrate Ub(G76V)-YFP and the 26S proteasome, acting late in the pathway. |
High-throughput siRNA imaging screen, single/double knockdown, pulse-chase degradation assays, co-immunoprecipitation with proteasome |
PloS one |
Medium |
23209776
|
| 2016 |
TRIP12 functions as an E3 ubiquitin ligase for USP7/HAUSP, controlling its protein stability; TRIP12 knockdown increases USP7-mediated stabilization of p53, 53BP1, and Chk1 and increases the G1 cell population, while TRIP12 overexpression phenocopies USP7 knockdown by increasing intra-S phase cells. |
Co-immunoprecipitation, siRNA knockdown, overexpression, western blot, cell cycle analysis by FACS |
FEBS letters |
Medium |
27800609
|
| 2020 |
TRIP12 binds PARP1 via its central PAR-binding WWE domain and, via its C-terminal HECT domain, catalyzes polyubiquitylation of PARP1 triggering proteasomal degradation; loss of TRIP12 elevates PARP1 levels, causing increased PARPi-induced cytotoxic PARP1 trapping, replication stress, and cell death. |
Co-immunoprecipitation, in vitro ubiquitination, siRNA knockdown, PARP1 trapping assay, cell viability/clonogenic survival, domain mapping (WWE and HECT) |
Cell reports |
High |
32755579
|
| 2021 |
TRIP12 promotes PROTAC/CRL2VHL-induced degradation of neo-substrate BRD4 (but not endogenous HIF-1α) by associating with BRD4 via CRL2VHL and specifically assembling K29-linked ubiquitin chains that facilitate formation of K29/K48-branched ubiquitin chains, accelerating K48 chain elongation and proteasomal degradation. |
Mass spectrometry-based ubiquitin linkage analysis, in vitro ubiquitination, siRNA/CRISPR knockout, PROTAC degradation assays, domain mapping, apoptosis assays |
Molecular cell |
High |
33567268
|
| 2021 |
TRIP12 interacts with glucocerebrosidase (GCase) and ubiquitinates it at lysine 293, triggering proteasomal degradation; TRIP12 overexpression causes premature GCase degradation, α-synuclein accumulation, and mitochondrial dysfunction; conditional TRIP12 knockout or knockdown promotes GCase expression and blocks dopaminergic neurodegeneration in PD models. |
Co-immunoprecipitation, in vitro ubiquitination, site-directed mutagenesis (K293), TRIP12 conditional KO mouse, in vivo knockdown, α-syn PFF model, western blot, human PD brain tissue analysis |
Neuron |
High |
34644545
|
| 2021 |
TRIP12 ubiquitinates FBW7 preferentially on K404/K412 (via SCFFBW7 self-ubiquitylation) and additionally assembles K11-linked branched ubiquitin chains on FBW7 via its HECT domain; this branched ubiquitylation is required for FBW7 proteasomal degradation; TRIP12 inactivation causes FBW7 accumulation and consequent MCL1 degradation, sensitizing cells to anti-tubulin chemotherapy. |
shRNA library screen, mass spectrometry, in vitro ubiquitination, site-directed mutagenesis of FBW7 K404/K412, CRISPR knockout, western blot, cell viability assays |
Nature communications |
High |
33824312
|
| 2020 |
TRIP12 expression is regulated during the cell cycle correlating with its nuclear localization; an N-terminal intrinsically disordered region (IDR) mediates euchromatin binding; TRIP12 controls duration of DNA replication (mitotic entry) independent of its catalytic activity, and is required for mitotic progression and chromosome stability. |
Cell cycle synchronization, western blot, immunofluorescence/live imaging, chromatin fractionation, siRNA knockdown, catalytic mutant complementation, FACS for chromosome stability |
Scientific reports |
Medium |
31964993
|
| 2021 |
WARS (tryptophanyl-tRNA synthetase) tryptophanylates TRIP12 at lysine 1136, activating its E3 ligase activity toward NFATc1 (a PD-1 transcription activator), promoting NFATc1 degradation and reducing PD-1 surface expression on CD8+ T cells; SIRT1 de-tryptophanylates TRIP12 and reverses these effects. |
Mass spectrometry identification of tryptophanylation, site-directed mutagenesis (K1136), co-immunoprecipitation, flow cytometry for surface PD-1, syngeneic mouse tumor models |
Journal for immunotherapy of cancer |
Medium |
34326168
|
| 2020 |
TRIP12 is identified by immunoprecipitation-coupled LC-MS/MS as an E3 ubiquitin ligase that binds and ubiquitinates the transcription factor YY1, leading to its proteasomal degradation; this triggers the HNF4α/miR-122/CCL2 pathway promoting hepatic inflammation during mild iron overload. |
Immunoprecipitation coupled LC-MS/MS, co-immunoprecipitation, western blot, siRNA knockdown, overexpression in vivo |
Free radical biology & medicine |
Medium |
33080340
|
| 2023 |
TRIP12 controls TGFβ signaling in a manner completely independent of its E3 ubiquitin ligase activity; instead, TRIP12 recruits SMURF2 to SMAD4, promoting inhibitory monoubiquitination of SMAD4; catalytically inactive C1959A mutant rescues TRIP12-KO phenotype; this function is evolutionarily conserved (Drosophila ctrip/Medea epistasis confirmed). |
CRISPR/Cas9 KO, catalytic mutant complementation (C1959A), co-immunoprecipitation of SMURF2-SMAD4, TGFβ reporter assays, Drosophila genetic epistasis, 3D intestinal organoids, migration assays |
Cell death & disease |
High |
37863914
|
| 2025 |
TRIP12 ubiquitylates DNA polymerase β (Polβ) in a BER complex-dependent manner, controlling Polβ cellular levels and chromatin loading; TRIP12-mediated Polβ ubiquitylation promotes Polβ foci formation at radiation-induced DNA damage sites, directing BER over DSB repair; excessive TRIP12-mediated Polβ engagement increases DSB formation and radiation sensitivity. |
Ubiquitination assays, chromatin fractionation, siRNA/CRISPR depletion, Polβ foci formation (immunofluorescence), radiation sensitivity/clonogenic assays, co-immunoprecipitation |
Nucleic acids research |
Medium |
40613707
|
| 2025 |
TRIP12 ubiquitylates BRG1 (SWI/SNF component) in the presence of Wnt signaling, promoting BRG1 interaction with β-catenin in the nucleus to recruit SWI/SNF to Wnt target genes; TRIP12 depletion attenuates Wnt signaling; genetic epistasis places TRIP12 downstream of the β-catenin destruction complex. |
CRISPR/siRNA depletion in Drosophila, zebrafish, mouse organoids, human cells; co-immunoprecipitation of BRG1-β-catenin; ubiquitination assays; genetic epistasis; Wnt reporter assays |
Nature communications |
High |
40473626
|
| 2025 |
TRIP12 functions as a ubiquitin chain elongation factor that cooperates with CUL3KEAP1 to ensure robust NRF2 degradation; TRIP12 activity accelerates silencing of the oxidative stress response as ROS are cleared but limits NRF2 activation during stress. |
CRISPR KO, NRF2 degradation assays, ubiquitin chain assays, oxidative stress/ROS assays, cell viability after oxeiptosis |
Cell reports |
Medium |
40928944
|
| 2025 |
TRIP12 ubiquitinates Frizzled-9b (Fzd9b) at K437 in its third intracellular loop, targeting it for lysosomal degradation, reducing Fzd9b membrane surface expression and dampening Wnt9a/Fzd9b signaling; this semi-selective action affects hematopoietic stem cell proliferation in zebrafish. |
Site-directed mutagenesis of Fzd9b K437, ubiquitination assays, flow cytometry for surface Fzd9b, zebrafish HSC proliferation assay, lysosome inhibitor experiments, co-immunoprecipitation |
iScience |
Medium |
41098776
|
| 2024 |
K29-linked ubiquitylation of SUV39H1 (H3K9me3 methyltransferase) is catalyzed by TRIP12 and reversed by TRABID; K29-linked ubiquitylation is essential for proteasomal degradation of SUV39H1 even in the presence of extensive K48-linked ubiquitylation; disruption of this modification deregulates the H3K9me3 landscape. |
Ubiquitin replacement cell-based strategy, MS-based linkage analysis, TRIP12 KO/depletion, in vitro ubiquitination, H3K9me3 ChIP, SUV39H1 stability assays |
bioRxivpreprint |
Medium |
bio_10.1101_2024.10.29.620783
|
| 2023 |
TRIP12 suppresses EMT through inhibiting ZEB1/2 gene expression; TRIP12-depleted cells gain mesenchymal traits (loss of polarity, increased motility, anoikis resistance); ZEB1/2 depletion rescues EMT markers in TRIP12-depleted cells, placing ZEB1/2 downstream of TRIP12. |
siRNA knockdown of TRIP12, RNA-seq, ZEB1/2 double KD rescue, cell polarity assays, migration assays, anoikis assays |
Cell death discovery |
Medium |
33963176
|
| 2016 |
p16 overexpression downregulates TRIP12, which leads to increased RNF168 levels, repressed DNA damage repair, increased 53BP1 foci, and enhanced radiosensitivity; TRIP12 inhibition further radiosensitizes cells, establishing a p16→TRIP12→RNF168 regulatory axis. |
p16 overexpression/shRNA knockdown, western blot for TRIP12 and RNF168, immunofluorescence for 53BP1 foci, clonogenic survival assays, neutral comet assay, cycloheximide half-life assay |
Oncogene |
Medium |
27425591
|
| 2023 |
TRIP12 associates with Ku70 at sites of DNA double-strand breaks; this association is enhanced upon ionizing radiation and is specific to the Ku70 S155 phosphorylated form, as identified by BioID2 proximity labeling and validated by proximity ligation assay and co-immunoprecipitation. |
BioID2 proximity labeling, SAINTexpress analysis, proximity ligation assay (PLA), co-immunoprecipitation after IR treatment |
International journal of molecular sciences |
Low |
37108203
|
| 2026 |
The N-terminal intrinsically disordered region (IDR) of TRIP12 drives formation of dynamic chromatin condensates enriched in heterochromatin marks through electrostatic interactions and bridging-induced phase separation; these condensates alter cell cycle progression, genome accessibility, and transcription independently of TRIP12's ubiquitin ligase activity. |
Live-cell imaging, FRAP, IDR deletion/mutation constructs, heterochromatin mark staining, ATAC-seq, transcriptome analysis, catalytic mutant controls |
iScience |
Medium |
41660270
|