| 2005 |
FBXO31 is a component of an SCF ubiquitin ligase complex, associating with Skp1, Roc-1, and Cullin-1, and its ectopic expression induces G1 cell cycle arrest in breast cancer cell lines. |
Co-immunoprecipitation (association with Skp1, Roc-1, Cullin-1); ectopic expression with cell cycle analysis by flow cytometry |
Cancer Research |
Medium |
16357137
|
| 2009 |
FBXO31 directly binds cyclin D1 and mediates its proteasomal degradation, requiring the F-box motif of FBXO31 and phosphorylation of cyclin D1 at Thr286, resulting in G1 arrest. DNA damage (gamma-irradiation) induces FBXO31 accumulation through ATM-mediated phosphorylation of FBXO31, and FBXO31 knockdown prevents efficient G1 arrest after DNA damage. |
Co-immunoprecipitation, RNAi knockdown, ectopic expression, proteasome inhibitor assays, domain mutagenesis (F-box deletion), ATM kinase epistasis, gamma-irradiation DNA damage model |
Nature |
High |
19412162
|
| 2013 |
FBXO31-SCF localizes to the centrosome and regulates neuronal morphogenesis, axonal identity, dendrite growth, and neuronal migration in developing cerebellar cortex. FBXO31 interacts with and targets the polarity protein Par6c for proteasomal degradation to control axon (but not dendrite) growth. |
Centrosomal localization (immunofluorescence), Co-immunoprecipitation, RNAi knockdown in cerebellar neurons, in vivo migration assays in cerebellar cortex |
PLoS One |
Medium |
23469015
|
| 2014 |
FBXO31 interacts with Cdt1 (DNA replication licensing factor) and mediates its ubiquitylation and proteasomal degradation specifically during G2 phase, independently of previously described Cdt1 proteolysis pathways (CRL4-Cdt2 and SCF-Skp2), preventing re-replication. Targeting is mediated through the N-terminus of Cdt1. |
Co-immunoprecipitation, ubiquitylation assay, cell cycle-synchronized degradation assay, RNAi knockdown with re-replication readout (flow cytometry) |
Journal of Biological Chemistry |
High |
24828503
|
| 2014 |
FBXO31 (as part of SCF complex) binds MKK6 and mediates its Lys48-linked polyubiquitination and proteasomal degradation, thereby negatively regulating p38 MAPK signaling and protecting cells from stress-induced apoptosis. |
Co-immunoprecipitation, ubiquitin linkage-specific assay (Lys48), RNAi knockdown, ectopic expression with p38 activation readout |
Journal of Biological Chemistry |
Medium |
24936062
|
| 2015 |
FBXO31 directs MDM2 degradation following genotoxic stress: ATM phosphorylates both FBXO31 (increasing its levels) and MDM2 (enabling recognition); FBXO31 then interacts with MDM2 and promotes its proteasomal degradation, resulting in elevated p53 levels and growth arrest. FBXO31 depletion prevents MDM2 degradation and p53 accumulation after DNA damage. |
Co-immunoprecipitation, RNAi knockdown, ATM kinase inhibition/epistasis, proteasome inhibitor assays, Western blot for p53/MDM2 levels |
PNAS |
High |
26124108
|
| 2016 |
FBXO31 interacts with and ubiquitinates FOXM1 specifically during the G2/M transition, promoting its degradation. Loss of FBXO31 leads to increased FOXM1 levels, spindle checkpoint activation, lagging chromosomes, and anaphase bridges; co-depletion of FOXM1 rescues genomic instability but not the mitotic delay, indicating FBXO31 has additional mitotic substrates. |
Co-immunoprecipitation, ubiquitination assay, RNAi double knockdown epistasis, flow cytometry, live-cell imaging for mitotic progression |
Oncogene |
High |
27568981
|
| 2017 |
Crystal structures of Skp1-FBXO31 complex alone and bound to phosphorylated cyclin D1 C-terminal peptide revealed that FBXO31 possesses a unique substrate-binding domain with two β-barrel motifs, and cyclin D1 binds by inserting its free C-terminal carboxylate tail into a cavity of the C-terminal β-barrel. Biophysical and functional studies showed SCFFBXO31 can ubiquitinate cyclin D1 in a phosphorylation-independent manner. |
X-ray crystallography, biophysical binding assays, in vitro ubiquitination assay, mutagenesis |
PNAS |
High |
29279382
|
| 2017 |
FBXO31 interacts with Snail1 (SNAI1) and mediates its ubiquitin- and proteasome-dependent degradation in gastric cancer cells, suppressing EMT. The F-box domain of FBXO31 and phosphorylation of Snail1 are required for the interaction. |
Co-immunoprecipitation, ubiquitination assay, ectopic expression/knockdown with EMT markers, domain/phosphorylation mutagenesis, mouse xenograft model |
Molecular Cancer Research |
Medium |
29117943
|
| 2018 |
APC/C (with coactivators CDH1 and CDC20) degrades FBXO31 via a D-box motif in a cell-cycle-regulated manner, maintaining low basal FBXO31 levels. AKT phosphorylates FBXO31 at Ser33 to enable APC/C-mediated degradation, while ATM phosphorylation of FBXO31 at Ser278 following DNA damage disrupts interaction with CDH1/CDC20, preventing FBXO31 degradation and allowing its levels to rise. |
Co-immunoprecipitation, site-directed mutagenesis (Ser33, Ser278, D-box), kinase inhibition, RNAi knockdown, cell-cycle synchronization, ubiquitination assay |
PNAS |
High |
29343641
|
| 2018 |
The SCF-E3 ligase FBXO46 recognizes an RXXR motif at the C-terminus of FBXO31 and directs its polyubiquitination and proteasomal degradation to maintain basal FBXO31 levels in unstressed cells, preventing premature senescence. Following DNA damage, ATM phosphorylates FBXO46 at Ser21/Ser67, leading to FBXO46 degradation via FBXO31 (negative feedback loop). |
Co-immunoprecipitation, molecular docking, RXXR motif mutagenesis, RNAi knockdown, ubiquitination assay, ATM kinase inhibitor |
Journal of Biological Chemistry |
High |
30171069
|
| 2019 |
FBXO31 interacts with Smad7 (negative regulator of TGF-β/Smad signaling) and enhances its ubiquitination, promoting fibrogenesis in hepatic stellate cells. FBXO31 and Smad7 co-localize in HSC-T6 cells and in mouse liver fibrosis tissues. |
Co-immunoprecipitation, immunofluorescence co-localization, ubiquitination assay, ectopic expression/knockdown with α-SMA and Col-1 readouts |
Journal of Cellular Biochemistry |
Medium |
31680332
|
| 2019 |
FBXO31 is essential for maintaining low cyclin A levels during G1 phase. Stable FBXO31 knockdown causes atypical cyclin A accumulation in G1, leading to premature DNA replication, compromised MCM loading, replication from fewer origins, and DNA double-strand breaks, resulting in genomic instability. |
Flow cytometry, Western blot, immunofluorescence, RNAi stable knockdown, DNA combing for replication origin analysis, γH2AX foci for DSBs |
Journal of Biological Chemistry |
Medium |
31413110
|
| 2021 |
CRL1FBXO31 promotes ubiquitylation-mediated degradation of DUSP6, a dual-specificity phosphatase that inactivates ERK1/2. FBXO31 depletion stabilizes DUSP6, suppresses ERK signaling, and activates PI3K-AKT signaling, promoting prostate tumor development. Pharmacological inhibition of DUSP6 rescues the tumor-promoting effects of FBXO31 loss. |
Co-immunoprecipitation, ubiquitylation assay, RNAi knockdown, mouse orthotopic tumor model, DUSP6 inhibitor (BCI) treatment |
Cell Reports |
High |
34686346
|
| 2022 |
FBXO31 interacts with and promotes ubiquitination and proteasomal degradation of GPX4, sensitizing cholangiocarcinoma cancer stem cell-like cells to cisplatin-induced ferroptosis. GPX4 overexpression reverses FBXO31-promoted ferroptosis. |
Co-immunoprecipitation, ubiquitination assay, ectopic expression/knockdown, ferroptosis assay, GPX4 rescue experiment, in vivo tumor model |
Liver International |
Medium |
36269678
|
| 2022 |
c-Myc suppresses FBXO31 transcription by binding its promoter (shown by ChIP), while FBXO31 reciprocally interacts with c-Myc and directs its polyubiquitination via the SCF complex and proteasomal degradation in a phosphorylation-independent manner, inhibiting ovarian cancer growth. |
Chromatin immunoprecipitation (c-Myc at FBXO31 promoter), Co-immunoprecipitation, ubiquitination assay, ectopic expression/knockdown, in vitro and in vivo tumor growth assays |
International Journal of Cancer |
Medium |
34706096
|
| 2024 |
FBXO31 promotes proteasome-dependent degradation of SIRT2 by interacting with its sirtuin-type domain, and this is regulated upstream by METTL3-mediated m6A modification of FBXO31 mRNA, enhancing FBXO31 translation in a YTHDF1-dependent manner. |
Co-immunoprecipitation, ubiquitination assay, protein half-life assay, domain mapping (sirtuin-type domain of SIRT2), m6A RNA modification analysis, YTHDF1 knockdown |
Cell Death & Disease |
Medium |
38216561
|
| 2025 |
FBXO31 is a reader of C-terminal amide-bearing proteins (CTAPs), recognizing their C-terminal amide modification via a conserved binding pocket in its β-barrel domain. FBXO31 recruits CTAPs to the SCF ubiquitin ligase for ubiquitylation and proteasomal degradation, enabling surveillance of chemically damaged proteins. A dominant neurodevelopmental disorder mutation reverses substrate specificity such that non-amidated neo-substrates are now degraded. |
CRISPR screen to identify FBXO31, semi-synthetic chemical biology approach, crystal structure-informed binding pocket analysis, in vitro ubiquitylation, mutagenesis of binding pocket residues, cellular degradation assays |
Nature |
High |
39880951
|
| 2025 |
FBXO31 mediates ubiquitination and proteasomal degradation of OGT (O-GlcNAc transferase), thereby regulating O-GlcNAcylation homeostasis in endometrial cancer cells. |
CRISPR screen, Co-immunoprecipitation, ubiquitination assay, ectopic expression/knockdown, endometrial organoid models, mouse tumor model |
Nature Communications |
Medium |
39894887
|
| 2025 |
FBXO31 phosphorylation at Thr37 and Ser523 contributes to FBXO31 protein stabilization, as shown by identification of five phosphorylation sites (Thr28, Thr37, Ser33, Ser400, Ser523) by LC-MS/MS in HEK293T cells, with mutagenesis demonstrating differential effects on protein turnover. |
LC-MS/MS phosphoproteomics, site-directed mutagenesis, cycloheximide chase assay, Western blot, flow cytometry |
Advanced Biology |
Medium |
40847744
|
| 2026 |
FBXO31 can be exploited as a TPD-competent E3 ligase using C-terminal amide-bearing degrons (amidated Ala-Phe motif as chemical recruiter), forming ternary complexes with neo-substrates (FKBP12, multiple kinases, BRD2/3/4) for targeted degradation. Key residues in FBXO31 required for recruiter engagement were identified. |
Ternary complex formation assay, targeted protein degradation assays, mutagenesis of FBXO31 residues, biochemical degradation assays for multiple substrates |
Journal of the American Chemical Society |
Medium |
41963263
|
| 2026 |
FBXO31 interacts with ABL2 via its F-box motif, promotes ABL2 ubiquitination and proteasomal degradation, and thereby induces xCT-mediated ferroptosis and inhibits progression in triple-negative breast cancer. |
Co-immunoprecipitation, ubiquitination assay, F-box domain mutagenesis, ectopic expression/knockdown, ferroptosis assay, rescue experiments, mouse tumor model |
American Journal of Translational Research |
Medium |
42170439
|
| 2021 |
FBXO31 binds cofilin-1 (shown by mass spectrometry and co-immunoprecipitation), and FBXO31-mediated Taxol chemoresistance in esophageal squamous cell carcinoma is at least partly dependent on cofilin-1, as cofilin-1 knockdown in FBXO31-overexpressing cells reversed FBXO31-induced suppression of apoptosis. |
Mass spectrometry, co-immunoprecipitation, RNAi knockdown epistasis, apoptosis assay (FACS/TUNEL), in vivo xenograft |
Biochemical and Biophysical Research Communications |
Low |
34839191
|