| 2009 |
Ube2g2 can assemble Lys-48-linked polyubiquitin chains on its own catalytic cysteine (active site-linked polyubiquitin chains) via a gp78 oligomer that simultaneously associates with multiple Ube2g2 molecules, bringing them into close proximity to allow ubiquitin transfer between neighboring Ube2g2s. |
In vitro ubiquitination assay, co-IP/pulldown, identification of gp78 oligomerization sites and a novel Ube2g2 surface distinct from the RING-binding site |
Proceedings of the National Academy of Sciences of the United States of America |
High |
19223579
|
| 2010 |
AUP1 localizes to lipid droplets and binds Ube2g2 via its G2BR (G2 binding region) domain, recruiting the ubiquitination machinery to lipid droplets; deletion or mutation of the G2BR abolishes Ube2g2 binding without affecting AUP1 LD localization. |
Co-IP, pulldown, domain deletion/mutagenesis, confocal microscopy, subcellular fractionation |
The Journal of biological chemistry |
High |
21127063
|
| 2006 |
Crystal structure of human UBE2G2/UBC7 at 2.56 Å resolution reveals a single domain with antiparallel β-sheet, five α-helices, and two 3(10)-helices; structural comparison with UbcH7 in a RING-containing ternary complex suggests that two loop regions of UBE2G2 interact with the RING domain and may confer binding specificity. |
X-ray crystallography, structural superimposition |
Acta crystallographica. Section F, Structural biology and crystallization communications |
High |
16582478
|
| 2010 |
Solution NMR structure of Ube2g2 demonstrates that catalytically important loops flanking the active site cysteine (residues 95-107 and 130-135) are highly dynamic, suggesting that partner proteins (E3, acceptor ubiquitin, or thiolester-linked ubiquitin) are required to stabilize a catalytically relevant conformation; His94 may act as a general base activated by Asp98/Asp99. |
NMR spectroscopy, 15N spin relaxation, residual dipolar coupling analysis |
Proteins |
High |
20014027
|
| 2010 |
Ube2g2 binds ubiquitin with ~90 µM affinity in two orientations; it preferentially interacts with the distal subunit (containing the free Lys-48) of Lys-48-linked diubiquitin (~3-fold higher affinity than proximal subunit), positioning the terminal ubiquitin for chain elongation regardless of chain length. |
NMR chemical shift perturbation, paramagnetic relaxation enhancement, RosettaDock modeling |
The Journal of biological chemistry |
Medium |
21098018
|
| 2014 |
Ube2g2 and gp78 mediate polyubiquitylation and proteasomal degradation of HERP after ER stress; this requires a physical interaction between the CUE domain of gp78 and the ubiquitin-like (UBL) domain of HERP. |
In vitro ubiquitylation assay, co-IP, domain deletion/mutagenesis, cell-based degradation assays |
Journal of cell science |
High |
24496447
|
| 2014 |
CYP3A4 ubiquitination is mediated by the UBC7-gp78 E2-E3 complex; Ser/Thr phosphorylation of CYP3A4 by PKA/PKC generates phosphodegrons (acidic Asp/Glu/Ser(P)/Thr(P) clusters) that are recognized by gp78 for substrate recruitment and ubiquitination. |
Site-directed mutagenesis, chemical cross-linking, peptide mapping, LC-MS/MS, in vitro ubiquitination |
The Journal of biological chemistry |
High |
25451919
|
| 2016 |
The CUE domain of Cue1 (the yeast Ube2g2/Ubc7 activator) aligns growing Lys-48-linked ubiquitin chains with Ubc7 for rapid elongation by binding to a ubiquitin moiety adjacent to the acceptor ubiquitin; disrupting this mechanism delays ERAD substrate turnover. |
NMR-based analysis, in vitro ubiquitination reactions, mutagenesis |
Molecular cell |
High |
27264873
|
| 2017 |
Binding of the gp78 G2BR domain to Ube2g2 increases RING affinity for Ube2g2 ~50-fold through allosteric redistribution of conformational populations; RING binding then promotes closed conformation of the Ube2g2~Ub conjugate (from ~60% to ~82% closed) to stimulate ubiquitin transfer. |
NMR conformational dynamics, single-turnover diubiquitin formation assay, mutagenesis |
Structure (London, England : 1993) |
High |
28434917
|
| 2017 |
gp78-RING binding stabilizes the closed (catalytically active) conformation of the Ube2g2~Ub conjugate, with the hydrophobic patch of the thiolester-linked ubiquitin being required for the closed state; the rate-limiting step for a single ubiquitin ligation event is organization of the active site into a catalytically viable conformation. |
NMR spectroscopy, single-turnover diubiquitin formation assay, hydrophobic patch mutagenesis |
ACS omega |
Medium |
28884161
|
| 2021 |
The 27-aa G2BR domain of AUP1 binds with nanomolar affinity to the backside of UBE2G2 via salt bridges, hydrogen bonds, and hydrophobic interactions; this interaction allosterically activates UBE2G2 for ubiquitination, recruits UBE2G2 to the ER membrane, and prevents rapid degradation of UBE2G2 itself. |
Crystal/co-crystal structure, in vitro ubiquitination assay, mutagenesis, cell-based ERAD assays, protein stability measurements |
PLoS biology |
High |
34879065
|
| 2019 |
Crystal structure of the S. pombe U7BR (E2BR) in complex with Ubc7 at 1.7 Å shows the E2BR binds the backside of the E2 as an α-helix; the S. pombe E2BR sterically impedes E1 binding and inhibits E1-mediated charging of Ubc7, a biochemical outcome distinct from the S. cerevisiae E2BR. |
X-ray crystallography, in vitro E1-charging assay |
Acta crystallographica. Section F, Structural biology communications |
High |
31397327
|
| 2003 |
Mammalian UBC7 (UBE2G2) directly associates with the C-terminal region (amino acids 169-234) of type 2 iodothyronine deiodinase (D2), mediating its ERAD; truncated D2 containing residues 169-234 acts as a dominant negative to stabilize D2, and dominant-negative UBC7 stabilizes D2 half-life in cells. |
GST pulldown, co-IP, dominant-negative overexpression, pulse-chase half-life assay in HEK-293 cells |
Molecular endocrinology (Baltimore, Md.) |
Medium |
12933904
|
| 2003 |
MmUbc7 (UBE2G2) mediates ubiquitination and proteasomal down-regulation of inositol 1,4,5-trisphosphate receptors (InsP3Rs) in response to muscarinic agonist stimulation; dominant-negative MmUbc7 blocks InsP3R ubiquitination whereas dominant-negative MmUbc6 does not; Zn2+ chelation blocks InsP3R ubiquitination, implicating a RING finger E3. |
Stable expression of dominant-negative E2s, ubiquitination assay, receptor down-regulation assay in SH-SY5Y cells and rat brain slices |
The Journal of biological chemistry |
Medium |
12869571
|
| 2024 |
UBE2G2 directly binds LGALS3BP and, together with the E3 ligase TRIM38, forms a complex that mediates K104 ubiquitination and proteasomal degradation of LGALS3BP, thereby inhibiting PI3K/AKT signaling and vasculogenic mimicry in uveal melanoma. |
Co-IP, ubiquitination assay, site-directed mutagenesis (K104 site), KD/OE with phenotypic readouts (VM, metastasis, signaling) |
Acta pharmaceutica Sinica. B |
Medium |
39807310
|
| 2025 |
The AUP1-UBE2G2 complex interacts with STING and retains it in the ER membrane to prevent its translocation to the Golgi and spontaneous activation; deficiency of either AUP1 or UBE2G2 leads to spontaneous STING activation and enhanced type I interferon expression. |
Co-IP, genetic knockdown/knockout, innate immune signaling assays, virus infection experiments in vitro and in vivo |
mBio |
Medium |
40237449
|
| 2025 |
A nanobody binding the backside of UBE2G2 differentially inhibits E3-mediated ubiquitination in the order HRD1 > CHIP >> TRC8, and the natural G2BR segment of gp78 (which normally enhances UBE2G2 activity) shows similar inhibitory effects on the same E3s when added in trans; this demonstrates that occupation of the backside site of UBE2G2 modulates its interactions with different E3s in a partner-specific manner. |
Nanobody-binding assay, in vitro ubiquitination assay with multiple E3s, comparison with G2BR peptide |
Communications biology |
Medium |
40234692
|
| 2024 |
UBE2G2 is required for ERAD-mediated degradation of proinsulin in pancreatic β-cells; knockdown of UBE2G2 impairs proinsulin degradation and reduces HLA class I presentation of the PPIB10-18 autoantigen, identifying UBE2G2 as the relevant E2 in this ERAD pathway. |
siRNA knockdown screen of E2 enzymes, proinsulin degradation assay, antigen presentation assay |
PloS one |
Medium |
38787820
|
| 1999 |
The 13-amino acid loop insertion in mammalian UBC7 (UBE2G2) distal to the active site cysteine influences E1 interaction and E3/substrate specificity; deletion of the loop increased E1-Ub thiolester affinity and permitted partial E3-dependent conjugation, whereas grafting the loop onto E214k redirected it to accept NEDD8 instead of ubiquitin. |
Loop deletion/insertion mutagenesis, E1 charging assay, E3-dependent ubiquitination assay |
The Journal of biological chemistry |
Medium |
10329663
|
| 2026 |
Beyond ERAD, UBE2G2 influences cell shape and motility: inactive UBE2G2 causes cell elongation with reorganization of actin stress fibers to cortical ventral fibers, redistribution of vinculin, loss of lamellipodia, and polarized filopodia, resulting in reduced wound closure; sequestration of wild-type UBE2G2 to the membrane by AUP1 mimics the elongated phenotype, indicating the cytosolic pool of UBE2G2 is responsible. |
Dominant-negative/inactive mutant expression, actin/vinculin imaging, wound closure assay, AUP1 co-expression experiments, live-cell tracking |
FASEB journal |
Medium |
41989348
|
| 2025 |
YTHDF3 (an m6A reader) binds UBE2G2 mRNA in an m6A-dependent manner and stabilizes it; benzene exposure reduces YTHDF3, decreasing UBE2G2 expression and thereby impairing UBE2G2-mediated ubiquitination of ACSL4, leading to ACSL4 stabilization, lipid peroxidation, and ferroptosis. |
RIP-qPCR, MeRIP-qPCR, UBE2G2 overexpression/knockdown, ubiquitination assay for ACSL4, ferroptosis readouts |
Ecotoxicology and environmental safety |
Medium |
41125048
|