| 2005 |
FBL2 (FBXL2) is geranylgeranylated via its CAAX motif (CVIL) and forms a stable complex with HCV nonstructural protein NS5A; this interaction requires the CAAX motif but not the F-box domain, and geranylgeranylated FBXL2 is required for HCV RNA replication. |
[(3)H]mevalonate labeling, coimmunoprecipitation, dominant-negative overexpression, siRNA knockdown, wobble-mutant rescue |
Molecular cell |
High |
15893726
|
| 2011 |
SCF(FBXL2) ubiquitinates and destabilizes cyclin D3 by recognizing a calmodulin (CaM)-binding motif within cyclin D3 (not a phosphodegron), leading to G2/M-phase arrest, supernumerary centrosomes, and apoptosis in lung cancer cells; calmodulin competes with FBXL2 for the same motif to protect cyclin D3. |
Overexpression, siRNA knockdown, polyubiquitination assays, cell cycle analysis, calmodulin competition assays, xenograft tumor model |
Oncogene |
High |
22020328
|
| 2011 |
SCF(FBXL2) monoubiquitinates and degrades CCTα (CTP:phosphocholine cytidylyltransferase α) at the Golgi complex during Pseudomonas aeruginosa infection, reducing phosphatidylcholine synthesis; FBXL2 binds the CCTα IQ motif via its C-terminus, and calmodulin antagonizes this interaction by binding FBXL2 residues 80–90. |
Co-immunoprecipitation, siRNA knockdown, overexpression, calcium-dependent activation assays, murine P. aeruginosa infection model, calmodulin gene transfer |
Molecular and cellular biology |
High |
21343341
|
| 2011 |
SCF(FBXL2) colocalizes with cyclin D3 at the centrosome and mediates cyclin D3 polyubiquitination and degradation, impairing cyclin D3 association with centrosomal assembly proteins Aurora A, Plk4, and CDK11, resulting in mitotic arrest. |
Co-localization imaging, RNAi knockdown, overexpression, cell cycle analysis |
Cell cycle |
Medium |
22024926
|
| 2012 |
FBXL2 ubiquitinates and degrades cyclin D2 by targeting a calmodulin-binding signature within cyclin D2 (not a phosphodegron), causing G0 arrest and apoptosis in leukemic cells; calmodulin competes with FBXL2 for this motif to protect cyclin D2. |
siRNA knockdown, overexpression, polyubiquitination assay, calmodulin competition assay, cell cycle analysis |
Blood |
High |
22323446
|
| 2012 |
FBXL2 binds the C-terminal fragment (CTF) of amyloid precursor protein (APP), promotes APP ubiquitination and proteasome-dependent degradation, inhibits APP endocytosis and localization in lipid rafts, and reduces Aβ peptide secretion; effects require an intact F-box domain. |
Overexpression, siRNA knockdown, co-immunoprecipitation, ubiquitination assay, APP localization studies, transgenic mouse model |
The Journal of neuroscience |
High |
22399757
|
| 2013 |
FBXL2 interacts with the pool of p85β regulatory subunit of PI(3)K that is free of p110 catalytic subunits and targets it for ubiquitylation and proteasomal degradation; this requires the FBXL2 CaaX motif. Phosphorylation of p85β at Tyr655 inhibits its binding to FBXL2, while the phosphatase PTPL1 dephosphorylates p-Tyr655 to stimulate p85β degradation. FBXL2-mediated p85β degradation prevents competition with p85-p110 heterodimers for IRS1 and sustains PI(3)K signaling. |
F-box protein purification/MS, co-immunoprecipitation, ubiquitination assay, phosphorylation site mutagenesis, IRS1 binding assays, autophagy readout |
Nature cell biology |
High |
23604317
|
| 2013 |
SCF(FBXL2) ubiquitinates Aurora B kinase at lysines K102, K103, and K207 within the midbody, promoting its degradation, mitotic arrest, and apoptosis; a triple-lysine mutant (K102/103/207R) resists SCF(FBXL2)-directed polyubiquitination. |
Co-immunoprecipitation, ubiquitination assay, lysine mutagenesis, overexpression, xenograft tumor model |
Cell death & disease |
High |
23928698
|
| 2015 |
Fbxo3-dependent ubiquitination of Fbxl2 leads to Fbxl2 degradation, reducing Fbxl2-mediated ubiquitination of TRAF2; elevated TRAF2 then activates TNIK/GluR1 phosphorylation and GluR1 trafficking to the plasma membrane, contributing to neuropathic allodynia after spinal nerve ligation. |
siRNA knockdown, intrathecal drug administration (BC-1215 Fbxo3 inhibitor), behavioral allodynia testing, immunoprecipitation, western blotting |
The Journal of neuroscience |
Medium |
26674878
|
| 2016 |
Fbxo3 inhibits Fbxl2-mediated ubiquitination of active zone protein RIM1α; deubiquitinated RIM1α accumulates in synaptic plasma membranes where it binds CaV2.2 and upregulates its expression, promoting neuropathic allodynia. |
siRNA knockdown, intrathecal BC-1215 administration, co-immunoprecipitation, electrophysiology (sEPSC), western blotting, behavioral testing |
The Journal of neuroscience |
Medium |
27629721
|
| 2016 |
FBXL2 interacts with FoxM1 transcription factor (identified by tandem mass spectrometry) and promotes its ubiquitination and proteasomal degradation in gastric cancer cells, suppressing expression of FoxM1 targets Cdc25B and p27 and inhibiting cancer cell proliferation and invasion. |
Tandem mass spectrometry, co-immunoprecipitation, ubiquitination assay, overexpression/knockdown, proliferation/invasion assays |
FEBS letters |
Medium |
26790640
|
| 2017 |
FBXL2 binds IP3R3 and targets it for ubiquitin-, p97-, and proteasome-mediated degradation, limiting Ca2+ transfer from the ER to mitochondria and preventing Ca2+-dependent apoptosis; PTEN competes with FBXL2 for IP3R3 binding to stabilize IP3R3, and FBXL2-insensitive IP3R3 knock-in mutant cells show increased cytosolic Ca2+ release and sensitization to apoptosis. |
Co-immunoprecipitation, ubiquitination assay, FBXL2-insensitive IP3R3 knock-in, FUNDC1/PTEN competition assays, Ca2+ imaging, xenograft model, Pten-/- MEFs |
Nature |
High |
28614300
|
| 2017 |
FBXL2 mediates ubiquitination and degradation of TRAF6, and LIPUS strengthens this pathway to suppress inflammatory cytokine production in response to polyethylene debris. |
Gene overexpression, siRNA, western blotting, immunoprecipitation |
Scientific reports |
Low |
28378753
|
| 2019 |
O-GlcNAcylation promotes ubiquitination and degradation of FBXL2 itself, which stabilizes its substrate FOXM1; FBXL2 ubiquitinates FOXM1 and the FBXL2-FOXM1 interaction is reduced by augmented O-GlcNAcylation (via OGA inhibitor Thiamet G). |
Co-immunoprecipitation, ubiquitination assay, OGA inhibitor treatment, overexpression/knockdown |
Biochemical and biophysical research communications |
Medium |
31679690
|
| 2020 |
FUNDC1 interacts with FBXL2 (interaction requires the F-box domain of FBXL2); FUNDC1 loss accelerates FBXL2 degradation and increases IP3R3 levels, resulting in mitochondrial Ca2+ overload and cardiac dysfunction in obese hearts. |
Co-immunoprecipitation, mass spectrometry, truncation mutants (ΔF-box), FUNDC1-/- mouse, Ca2+ measurements |
Science advances |
High |
32938669
|
| 2020 |
TNF-α suppresses Fbxl2 mRNA by activating JNK-mediated phosphorylation of SP1, which impairs SP1 binding to the Fbxl2 core promoter (bp -160 to +42); SP1 binding to the Fbxl2 promoter is required for skeletal myoblast differentiation. |
Chromatin immunoprecipitation, gel shift (EMSA), promoter-reporter assays, siRNA knockdown, JNK inhibition |
Molecular and cellular biology |
High |
32205409
|
| 2021 |
FBXL2 targets EGFR (and TKI-resistant EGFR mutants) for proteasomal degradation; Grp94 protects EGFR by blocking FBXL2 binding. Disrupting FBXL2 membrane localization (via GGTi-2418) or upregulating FBXL2 (via nebivolol) destabilizes EGFR and suppresses NSCLC growth. |
Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown, xenograft model, small-molecule functional studies |
Nature communications |
High |
34635651
|
| 2022 |
FBXL2 polyubiquitinates T-bet transcription factor and co-immunoprecipitates with T-bet; FBXL2 overexpression reduces T-bet protein levels in a dose-dependent manner. TNF-α negatively regulates FBXL2 at both protein and mRNA levels during lung allograft rejection. |
Co-immunoprecipitation, ubiquitination assay, transfection dose-response, orthotopic mouse lung transplant model, costimulation blockade |
Journal of immunology |
Medium |
36113884
|
| 2022 |
FBXL2 targets the transcription factor E47 for polyubiquitin- and proteasome-mediated degradation, inhibiting breast cancer stem cell (BCSC) stemness and paclitaxel resistance; nebivolol activates FBXL2 to overcome BCSC-driven resistance in vivo. |
Overexpression/knockdown, ubiquitination assay, mammosphere formation, xenograft model, nebivolol treatment |
Oncogene |
Medium |
36460773
|
| 2023 |
FBXL2 binds, ubiquitinates, and promotes proteasomal degradation of both NLRP3 and pro-IL-1β (but not pro-caspase-1), suppressing ATP-induced IL-1β secretion in LPS-primed macrophages; this is upregulated by BC-1215 (FBXO3 inhibitor). |
Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor (MG-132) rescue, western blotting |
Biochemical and biophysical research communications |
Medium |
37004285
|
| 2026 |
FBXL2 promotes polyubiquitination of HER2 at lysine K747 and its proteasomal degradation; blocking FBXL2 membrane localization (via GGTi-2418 or ketoconazole, which inhibit geranylgeranyl transferase) elevates HER2 plasma membrane expression in HER2-IHC 0 TNBC cells. |
Ubiquitination assay, site-directed mutagenesis (K747), co-immunoprecipitation, small-molecule inhibitor studies, xenograft model with LNP delivery |
Nature cancer |
High |
41612000
|