| 1997 |
UBE2E3 (Ubch9) cannot form a thioester with ubiquitin but can form a thioester with SUMO-1, establishing it as a SUMO conjugating enzyme rather than a ubiquitin conjugating enzyme. SUMO conjugation proceeds via a distinct E1 activity separate from the ubiquitin E1. |
In vitro thioester formation assay with ubiquitin and SUMO-1 |
FEBS letters |
High |
9409737
|
| 1998 |
In the presence of the SUMO-1 E1 activating enzyme, UBE2E3 (Ubch9) directly conjugates SUMO-1 to IκBα primarily on K21 (also used for ubiquitin modification), thereby protecting IκBα from signal-induced ubiquitination and proteasomal degradation and inhibiting NF-κB activation. Notably, unlike ubiquitination, SUMO-1 modification of IκBα is inhibited by phosphorylation of S32/S36. |
In vitro reconstitution with purified recombinant proteins; mutagenesis of IκBα lysine and serine residues |
Molecular cell |
High |
10582246 9734360
|
| 1999 |
The SUMO-1 E1 activating enzyme (SAE1/SAE2 heterodimer) transfers SUMO-1 thioester to UBE2E3 (Ubch9), which then conjugates SUMO-1 to IκBα in vitro without requiring an E3-equivalent activity, defining UBE2E3 as the E2 enzyme in the minimal SUMO-1 conjugation pathway. |
In vitro reconstitution with purified recombinant SAE1/SAE2, UBE2E3, SUMO-1, and IκBα; ATP-dependent thioester assay |
The Journal of biological chemistry |
High |
10187858
|
| 1999 |
UBE2E3 encodes a functional E2 ubiquitin-conjugating enzyme that forms an E1-dependent thioester bond with ubiquitin through its active-site cysteine (C145); mutation of C145 to serine abolishes thioester formation, confirming the catalytic cysteine. |
GST-fusion protein thioester assay; active-site mutagenesis (C145S) |
Cytogenetics and cell genetics |
High |
10343118
|
| 2001 |
UBE2E3 interacts with RING-finger proteins ARA54 and RNF8 via its UBC domain (interaction requires intact RING domain on the E3 partners), and supports E3-dependent autoubiquitination of ARA54 and RNF8 in vitro and in cells, linking UBE2E3 to nuclear protein ubiquitination. |
Yeast two-hybrid screen; deletion mutagenesis mapping; in vitro ubiquitination assay with Sf9-expressed proteins; transfection/ubiquitination in COS-7 cells |
European journal of biochemistry |
Medium |
11322894
|
| 2004 |
UBE2E3 acts as the E2 enzyme in concert with the E3 ligase Nedd4-2 to ubiquitinate and downregulate ENaC. UBE2E3 and Nedd4-2 co-immunoprecipitate. A catalytically inactive UBE2E3-C145S mutant increases ENaC cell-surface expression in Xenopus oocytes, and this effect depends on intact PY motifs (Nedd4-2 binding sites) and ubiquitination sites on ENaC. No additive effect is seen when UBE2E3-CS is co-expressed with an inactive Nedd4-2 mutant, placing UBE2E3 in the same pathway as Nedd4-2. |
Xenopus oocyte electrophysiology; co-immunoprecipitation; catalytic inactive mutant; epistasis with Nedd4-2 mutant; renal mpkCCD cell transepithelial Na+ transport assay |
Molecular and cellular biology |
High |
14993279
|
| 2004 |
UBE2E3 (Ubch9) promotes SUMO modification of Werner helicase (WRN) in a synergistic manner with the tumor suppressor p14 Arf. p14 Arf-driven WRN SUMOylation causes redistribution of WRN within the nucleus, an effect reversed by a SUMO-specific protease, implicating UBE2E3-mediated SUMOylation in WRN nuclear localization. |
Cell-based SUMO conjugation assay; co-expression; SUMO-specific protease reversal; fluorescence microscopy of WRN redistribution |
The Journal of biological chemistry |
Medium |
15355988
|
| 2005 |
Both Nedd4 and Nedd4-2 use UBE2E3 as an E2 partner in in vitro ubiquitination assays, but UBE2E3 supports substrate ubiquitination less efficiently than UbcH5b for these HECT E3 ligases. |
In vitro ubiquitination assay comparing multiple E2 enzymes |
The international journal of biochemistry & cell biology |
Medium |
16337426
|
| 2008 |
UBE2E3 localizes to the nucleus of RPE cells and is required for their proliferation; siRNA-mediated depletion causes cell-cycle exit, loss of Ki-67, accumulation of the CDK inhibitor p27Kip1, and doubling of cell area. The mouse ortholog UbcM2 is transcriptionally downregulated during RPE development in vivo. |
siRNA knockdown; immunofluorescence (Ki-67, p27Kip1); cell counting; rescue experiment; LacZ reporter mouse for developmental expression |
Investigative ophthalmology & visual science |
Medium |
18614808
|
| 2011 |
The N-terminal extension of UBE2E3 prevents it from functioning together with the RING E3 ligase Ro52 (TRIM21), unlike the N-terminal extensions of UBE2E1 and UBE2E2 which allow productive interaction, demonstrating that the class III E2 N-terminal extension uniquely modulates E2/E3 pairing specificity. |
E2 panel screening in ubiquitination assay; NMR and ELISA mapping of E2/E3 interface |
The Journal of biological chemistry |
Medium |
21862588
|
| 2014 |
UBE2E3 ubiquitinates TDP-43; all three UBE2E family members enhance TDP-43 ubiquitination, but catalytically inactive UBE2E3(C145S) is much less efficient. Silencing UBE2E3 reduces TDP-43 ubiquitination. UBE2E3 was identified as a TDP-43 interactor by yeast two-hybrid and confirmed by co-immunoprecipitation and co-localization in HEK293E cells. |
Yeast two-hybrid; co-immunoprecipitation; siRNA knockdown; overexpression with proteasome inhibitor; catalytic mutant (C145S) |
The Journal of biological chemistry |
Medium |
24825905
|
| 2014 |
UBE2E3 (UbcM2) is intrinsically restricted to monoubiquitylation: backside residues of the enzyme (distant from the active site) and K48 of ubiquitin together prevent polyubiquitin chain synthesis. Mutation of backside residues enables K63-linked (and to a lesser extent K6- and K48-linked) chain synthesis, revealing a two-fold non-catalytic restriction mechanism. |
Fully recombinant in vitro ubiquitylation assay; backside mutagenesis; ubiquitin K-to-R mutant panel |
Biochemistry |
High |
24901938
|
| 2014 |
UBE2E3 and its nuclear import receptor importin-11 (Imp-11) regulate NRF2 subcellular distribution and transcriptional activity. Knockdown of UBE2E3 reduces nuclear NRF2, decreases NRF2 target gene expression, and relocalizes NRF2 to a perinuclear cluster of mitochondria. Imp-11 restricts KEAP1 from prematurely extracting NRF2 from target gene promoters. |
siRNA knockdown; immunofluorescence; gene expression analysis of NRF2 target genes; subcellular fractionation |
Molecular biology of the cell |
Medium |
25378586
|
| 2014 |
Mulan (mitochondrial E3 ubiquitin ligase) interacts specifically with UBE2E3 among multiple E2 partners; the Mulan-UBE2E3 complex recruits GABARAP via an LC3-interacting region (LIR) in Mulan's RING domain, and this interaction requires the presence of UBE2E3. This places UBE2E3 in a mitophagy regulatory complex at the outer mitochondrial membrane. |
Modified yeast two-hybrid screen (RING-E2 fusion); co-immunoprecipitation; LIR motif mutagenesis |
Cellular signalling |
Medium |
25224329
|
| 2018 |
UBE2E3 loss induces cellular senescence in the absence of overt DNA damage. Cells depleted of UBE2E3 display a distinct senescence-associated secretory phenotype, increased mitochondrial and lysosomal mass, increased sensitivity to mitochondrial/lysosomal poisons, and elevated basal autophagic flux. The senescence phenotype is partially suppressed by co-depletion of p53, p21CIP1/WAF1, or p16INK4a. |
siRNA knockdown; SA-β-galactosidase assay; SASP marker analysis; organelle mass assays; genetic epistasis with p53/p21/p16 co-depletion |
Redox biology |
Medium |
29879550
|
| 2020 |
PJA1 (Praja1 RING-finger E3 ubiquitin ligase) co-immunoprecipitates with both CTF TDP-43 and UBE2E3, identifying UBE2E3 as the E2 partner for PJA1-mediated ubiquitination of TDP-43. PJA1 suppresses phosphorylation and cytoplasmic aggregate formation of TDP-43 in neuronal cells and in vivo in mouse motor neurons. |
Co-immunoprecipitation; adenoviral overexpression in neural stem cell-derived neurons; in vivo mouse facial motor neuron model |
Neuropathology |
Medium |
32686212
|
| 2020 |
OTUB1 inhibits the polyubiquitination activity of UBE2E3 (along with UBE2E1 and UBE2E2) at physiologically relevant concentrations. However, unlike UBE2E1 and UBE2E2, OTUB1 is unable to suppress autoubiquitination by UBE2E3, revealing a unique feature of UBE2E3 within the UBE2E family in its interaction with OTUB1. |
In vitro ubiquitination assay; kinetic/thermodynamic characterization of OTUB1:E2 complexes |
Biochemistry |
Medium |
32049508
|
| 2021 |
UBE2E3 knockdown accelerates cellular senescence and inhibits osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs), while overexpression of UBE2E3 attenuates senescence and enhances osteogenic differentiation of aged BMSCs. Mechanistically, UBE2E3 regulates the NRF2 pathway to control BMSC senescence and differentiation. |
siRNA knockdown; lentiviral overexpression; osteogenic differentiation assay; senescence markers; NRF2 pathway readout |
PeerJ |
Low |
34820159
|
| 2023 |
RCBTB1 co-immunoprecipitates with UBE2E3 and with CUL3 from RPE cell protein lysates, placing RCBTB1 in a complex with UBE2E3 and the CUL3 E3 ligase scaffold and suggesting UBE2E3 participates in a CUL3-RCBTB1 ubiquitin ligase complex relevant to oxidative stress response. |
Co-immunoprecipitation from iPSC-derived RPE cells using UBE2E3 and CUL3 antibodies |
Cells |
Low |
37408192
|