| 2002 |
CUL7 assembles an SCF-ROC1-like E3 ubiquitin ligase complex consisting of Skp1, CUL7, the Fbx29 (FBXW8) F-box protein, and ROC1. CUL7 was identified by mass spectrometry as a ROC1-interacting protein. CUL7 contains a cullin domain responsible for ROC1 binding and a DOC domain. Unlike CUL1 which binds Skp1 alone, CUL7 interacts selectively with the Skp1·Fbx29 heterodimer but not with Skp1 alone, nor with Skp1·betaTRCP2 or Skp1·Skp2. |
Mass spectrometry identification, co-immunoprecipitation, deletion/domain analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
12481031
|
| 2003 |
CUL7 (p185) forms an SCF-like complex with Skp1, Rbx1, Fbw6 (Fbx29/FBXW8), and FAP68 (glomulin). Targeted disruption of Cul7 in mice results in runted embryos that die at birth with respiratory distress, dermal hemorrhage, and placental defects including abnormal trophoblast differentiation and vascular structure, demonstrating a role for CUL7 in vascular morphogenesis and placental development. |
Co-immunoprecipitation, mouse knockout (targeted gene disruption), histological analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
12904573
|
| 2005 |
CUL7 assembles an E3 ubiquitin ligase complex with SKP1, RBX1, and the F-box protein FBXW8. CUL7 nonsense (R1445X) and missense (H1464P) mutations associated with 3-M syndrome render CUL7 deficient in recruiting ROC1, suggesting impaired ubiquitination underlies the pathogenesis. CUL7 uses its central region to interact with the Skp1-Fbx29 heterodimer. |
Deletion analysis, co-immunoprecipitation, mutant functional assay |
Nature genetics |
High |
16142236
|
| 2004 |
SV40 large T antigen binds the CUL7 SCF-like complex (containing p185/CUL7, Rbx1, and Fbw6/FBXW8) via an N-terminal region. p185/CUL7-binding-deficient T antigen mutants retain binding to pRb and p53 but are unable to transform primary mouse embryo fibroblasts, indicating that CUL7 binding is required for T antigen-mediated cellular transformation and that CUL7 may regulate a growth control pathway. |
Co-immunoprecipitation, T antigen mutagenesis, focus formation / anchorage-independent growth assays, MEF transformation |
Journal of virology |
High |
14990695
|
| 2005 |
SV40 T antigen residues 69–83 are required for binding to the CUL7 complex. Delta69-83 T antigen loses CUL7 binding while retaining p53 and pRB binding. Wild-type T antigen induces MEF proliferation (transformation) in the presence of CUL7, but delta69-83 T antigen does not, suggesting CUL7 is a target whose inactivation by T antigen contributes to transformation and that CUL7 may function as a tumor suppressor. |
Deletion mutagenesis, co-immunoprecipitation, MEF proliferation and transformation assays |
Journal of virology |
High |
16140746
|
| 2006 |
CUL7 forms a heterodimeric complex with CUL1 in a manner dependent on FBXW8 (Fbxw8). Fbxw8-knockout mice lack CUL7–CUL1 association. Fbxw8-null mice show intrauterine growth retardation and placental defects similar to Cul7-null mice, but some abnormalities of Cul7-/- mice are absent, indicating that the CUL7–Fbxw8 complex has both Fbxw8-dependent and Fbxw8-independent functions. |
Co-immunoprecipitation, mouse knockout (Fbxw8 targeting), genetic epistasis |
Molecular and cellular biology |
High |
16880526
|
| 2006 |
CUL7 directly binds p53 via a discrete, evolutionarily conserved domain (CPH domain) that is also conserved in PARC and HERC2. This p53-binding domain is necessary and sufficient for p53 interaction, p53 stabilizes expression of this domain, and the domain contributes to cytoplasmic localization of CUL7. CUL7 binding to p53 does not affect p53 expression levels. |
Co-immunoprecipitation, deletion analysis, subcellular localization by imaging |
Biochemical and biophysical research communications |
Medium |
16875676
|
| 2007 |
The CPH domains of CUL7 and PARC are protein–protein interaction modules that bind the tetramerization domain of p53. NMR structure of the CUL7-CPH domain reveals a fold similar to SH3, Tudor, and KOW domains, but the p53-binding surface is distinct from the canonical peptide-binding surfaces of those domains. The p53 interaction surface on p53 resides in its tetramerization domain and involves residues from at least two subunits. |
NMR spectroscopy, size-exclusion chromatography, structural determination with functional validation |
The Journal of biological chemistry |
High |
17298945
|
| 2007 |
CUL7 and PARC form homodimers and heterodimers. Tandem affinity purification–MudPIT analysis revealed that the CUL7 interaction with FBXW8 is mutually exclusive with CUL7 binding to PARC or p53. PARC binds RBX1 and is covalently modified by NEDD8, defining PARC as a cullin, but PARC fails to bind SKP1 or F-box proteins including FBXW8. All examined PARC- and CUL7-containing subcomplexes exhibit E3 ubiquitin ligase activity in vitro. Parc-/-/Fbxw8-/- double knockout does not exacerbate the Fbxw8-/- phenotype. |
Tandem affinity purification, MudPIT mass spectrometry, in vitro ubiquitin ligase assay, double-knockout genetic epistasis |
Cancer research |
High |
17332328
|
| 2007 |
CUL7 binds p53 directly and its knockdown by siRNA elevates p53 protein levels. CUL7 exerts an anti-apoptotic function through p53, enabling it to inhibit Myc-induced apoptosis. CUL7 cooperates with Myc to drive cellular transformation in soft agar assays. |
Expression cloning screen, co-immunoprecipitation, siRNA knockdown, anchorage-independent growth assay |
Cancer research |
Medium |
17942889
|
| 2005 |
PARC (a CUL7 homolog) was identified as a CUL7-interacting protein by mass spectrometry. CUL7 and PARC form endogenous hetero- and homodimers in vivo. Parc knockout mice are born at expected Mendelian ratios with no apparent phenotype, and Parc deletion does not affect p53 stability, localization, or function, indicating that PARC and CUL7 functions are at least partially non-overlapping. |
Mass spectrometry, co-immunoprecipitation, Parc knockout mouse |
Molecular and cellular biology |
Medium |
15964813
|
| 2008 |
IRS-1 (insulin receptor substrate 1) is a proteolytic substrate of the CUL7 E3 ubiquitin ligase. IRS-1 degradation depends on mTOR and p70 S6 kinase activity. Cul7-/- mouse embryonic fibroblasts accumulate IRS-1 and show increased activation of Akt and MEK/ERK pathways, but grow poorly and display oncogene-induced senescence-like phenotypes. |
Ubiquitin ligase assay, Cul7-/- MEF analysis, signaling pathway analysis, mTOR/S6K inhibition |
Molecular cell |
High |
18498745
|
| 2013 |
The CUL7/FBXW8 ubiquitin ligase targets hematopoietic progenitor kinase 1 (HPK1) for ubiquitination and proteasomal degradation. HPK1 ubiquitination requires its kinase activity and autophosphorylation (at Thr-355). Protein phosphatase 4 (PP4) dephosphorylates Thr-355 and inhibits Fbxw8–HPK1 interaction, thereby stabilizing HPK1. Knockdown of Fbxw8 restores endogenous HPK1 and inhibits pancreatic cancer cell proliferation. |
Co-immunoprecipitation, in vitro ubiquitination assay, phosphorylation/dephosphorylation analysis, siRNA knockdown, cell proliferation assay |
The Journal of biological chemistry |
High |
24362026
|
| 2012 |
CUL7 E3 ligase ubiquitinates TBC1D3 in response to serum/growth factor stimulation, leading to its proteasomal degradation. TBC1D3 physically interacts with CUL7 (identified by yeast two-hybrid) and recruits FBXW8 in pulldown and in vitro assays. Phosphorylation of TBC1D3 is critical for Fbxw8 recruitment and subsequent ubiquitination; alkaline phosphatase treatment of TBC1D3 suppresses Fbxw8 recruitment. |
Yeast two-hybrid, co-immunoprecipitation, pulldown, in vitro ubiquitination assay, phosphatase treatment |
PloS one |
High |
23029530
|
| 2011 |
CCDC8 co-immunoprecipitates with OBSL1 but not with CUL7, placing CCDC8 in a pathway with CUL7 and OBSL1 through OBSL1 as an intermediary. CUL7(-/-) cells show impaired IGF1-stimulated AKT activation, consistent with dysregulated IGF1 signaling downstream of CUL7. |
Co-immunoprecipitation, exome sequencing for pathway placement, signaling assays in patient-derived fibroblasts |
American journal of human genetics |
Medium |
21737058
|
| 2012 |
CUL7(-/-) patient fibroblasts show impaired AKT activation in response to IGF1 stimulation at 5 min post-stimulation, while GH-induced STAT5b and MAPK activation is normal. This indicates CUL7 loss specifically impairs IGF1 signaling through the PI3K/AKT axis. |
Cell signaling assays (phospho-Western) in patient-derived CUL7-/- fibroblasts |
Journal of molecular endocrinology |
Medium |
23018678
|
| 2019 |
CUL7 promotes cancer cell survival by interacting with Caspase-8 and promoting its modification with non-degradative polyubiquitin chains at K215, thereby preventing Caspase-8 activation. CUL7 knockdown sensitizes cancer cells to TRAIL-induced apoptosis in vitro and in nude mice. |
Co-immunoprecipitation, ubiquitination assay, site-directed mutagenesis (K215), siRNA knockdown, apoptosis assay in vitro and in vivo |
International journal of cancer |
High |
30807646
|
| 2019 |
CUL7 E3 ubiquitin ligase mediates ubiquitination of AID (activation-induced cytidine deaminase) by forming a complex with FBXW11. CUL7 overexpression or knockdown regulates AID protein levels and IgA class switching in B cells. CUL7 conditional knockout (CUL7 fl/fl CD19-Cre) in mice increases AID protein levels in germinal center B cells and enhances IgG1 and IgA class switching. |
Co-immunoprecipitation, ubiquitination assay, CUL7 conditional knockout mouse, B cell class switch recombination assay |
Journal of immunology |
High |
31092637
|
| 2020 |
CUL7 physically associates with MST1, promoting ubiquitin-mediated MST1 protein degradation, which activates the NF-κB signaling pathway to promote glioma cell growth. |
Co-immunoprecipitation, siRNA/shRNA knockdown, CUL7 overexpression, in vitro and in vivo tumor assays, western blot for NF-κB pathway markers |
Journal of experimental & clinical cancer research |
Medium |
32252802
|
| 2024 |
CUL7 promotes ubiquitination and degradation of glutathione peroxidase 4 (GPX4) in photoreceptors. CUL7 knockdown prevents Cul7-mediated GPX4 ubiquitination and degradation, inhibiting photoreceptor ferroptosis and alleviating retinal degeneration in mouse models. |
Transcriptome sequencing to identify target, siRNA knockdown, ubiquitination assay (GPX4), in vivo mouse models (MNU-induced and Pde6βrd1/rd1 mutant) |
Theranostics |
Medium |
39267786
|
| 2025 |
CUL7 promotes HER2 ubiquitination in HER2-positive breast cancer. CAND1 directly interacts with HER2 and stabilizes its expression; CAND1 knockdown enhances CUL7 neddylation, activating its ligase activity and leading to HER2 ubiquitination and destabilization. |
Co-immunoprecipitation, western blot, ubiquitination assay, CAND1 knockdown, in vivo xenograft |
Breast cancer research |
Medium |
41310794
|
| 2026 |
CUL7 interacts with KEAP1 and catalyzes K29- and K48-linked polyubiquitination of KEAP1 to promote its proteasomal degradation, thereby activating NRF2 signaling and reducing ROS levels in colon cancer cells. The C-terminus of CUL7 is required for KEAP1 stability regulation. |
Co-immunoprecipitation, ubiquitination assay (linkage-specific), CUL7 knockout mouse model, CUL7 domain deletion, cancer cell KO/overexpression |
Cell death & disease |
Medium |
42252284
|
| 2026 |
CCDC8 interacts with CUL7 to facilitate proteasome-dependent degradation of P53. Pharmacological inhibition of neddylation (MLN4924) restored P53 levels and reversed CCDC8-driven oncogenic effects, implicating neddylation-dependent CUL7 activity in CCDC8-mediated P53 degradation in bladder cancer. |
Co-immunoprecipitation, western blot, MLN4924 neddylation inhibition, in vitro and in vivo tumor assays |
Oncogene |
Medium |
41644704
|