| 2006 |
DTL/CDT2/DCAF2 is a substrate receptor (DCAF) for the CUL4-DDB1 E3 ubiquitin ligase complex. It is recruited to replication forks via CDT1 and PCNA, where it ubiquitylates CDT1 to promote its destruction in S phase and after DNA damage, preventing rereplication. Depletion of human CDT2 causes rereplication and checkpoint activation. |
Affinity purification/mass spectrometry identification of DCAFs; Xenopus egg extract depletion/reconstitution assays; siRNA knockdown in human cells; Co-IP; cell cycle analysis |
Molecular cell |
High |
16949367
|
| 2006 |
L2DTL/CDT2 associates with CUL4, DDB1, and PCNA in human cells, and loss of L2DTL suppresses CDT1 proteolysis in response to DNA damage. PCNA interacts with CDT1 and is required for CDT1 proteolysis after DNA damage. Inactivation of L2DTL causes dissociation of DDB1 from the CUL4 complex. |
Anti-CUL4 antibody affinity chromatography/mass spectrometry; anti-L2DTL immunoaffinity chromatography; Co-IP; siRNA knockdown in Drosophila S2 and human cells; Western blot |
Cell cycle (Georgetown, Tex.) |
High |
16861906
|
| 2006 |
L2DTL/CDT2 and PCNA physically interact with p53 and MDM2/HDM2. CUL4A complexes display polyubiquitination activity towards p53 dependent on L2DTL, PCNA, DDB1, ROC1, and MDM2. Inactivation of CUL4A, L2DTL, PCNA, DDB1, or ROC1 induces p53 stabilization and growth arrest. MDM2 is rapidly proteolyzed after UV irradiation through a CUL4/DDB1- and PCNA-regulated mechanism. |
Co-IP; in vitro ubiquitination assay; siRNA knockdown; Western blot |
Cell cycle (Georgetown, Tex.) |
Medium |
16861890
|
| 2006 |
DTL/CDT2 is an essential component of the CUL4-DDB1 E3 ubiquitin ligase that controls CDT1 levels, preventing rereplication. DTL is also required for the early radiation-induced G2/M checkpoint independently of CDT1. In zebrafish, reduction of Cdt1 suppresses the rereplication defect of dtl/cdt2-deficient fish but not the G2/M checkpoint defect, establishing two distinct mechanistic roles. |
Zebrafish forward genetic screen; genetic epistasis (cdt1 reduction in dtl mutants); human DTL siRNA knockdown; cell cycle analysis |
Genes & development |
High |
17085480
|
| 2006 |
L2dtl gene knockout in mice results in early embryonic lethality at the 4-8 cell stage. siRNA-mediated depletion of L2dtl in mouse embryos causes cell cycle progression failure, mitotic catastrophe (chromosomal fragmentation and lagging), and failure to develop to blastocysts. In HeLa cells, L2dtl depletion results in multinucleation and downregulation of PCNA and PTTG1/securin. |
Targeted gene disruption in mice; microinjection of siRNA into two-cell embryos; RNAi in HeLa cells; morphological analysis; Western blot |
The Journal of biological chemistry |
High |
17107960
|
| 2006 |
L2DTL protein localizes to the nucleus during interphase and concentrates at centrosomes (co-localizing with gamma-tubulin and Aurora-A) throughout the cell cycle. L2DTL protein is degraded in mitosis by the APC/C-Cdh1 complex. L2DTL gene expression peaks at G1/S phase. |
Immunostaining; Western blotting; centrosome isolation/co-fractionation with gamma-tubulin; cell cycle synchronization |
Cell cycle (Georgetown, Tex.) |
Medium |
17106265
|
| 2008 |
DTL/RAMP protein shows cell-cycle-dependent localization in breast cancer cells: nuclear during interphase and concentrated at the contractile ring during cytokinesis. DTL/RAMP is phosphorylated by Aurora kinase B (AURKB) in vitro. Depletion of AURKB reduces DTL/RAMP phosphorylation and decreases DTL/RAMP protein stability. |
Immunocytochemistry; Western blot; in vitro kinase assay with AURKB; siRNA knockdown of AURKB; cell cycle analysis |
Oncogene |
Medium |
18542055
|
| 2010 |
CRL4(CDT2) ubiquitylates and destroys the histone methyltransferase Set8/PR-Set7 during S phase and after DNA damage. Set8 ubiquitylation occurs on chromatin and requires a specific PIP degron in Set8 that binds PCNA. Inactivation of CRL4(CDT2) leads to Set8 stabilization, aberrant H4K20me1 accumulation, premature chromatin compaction, and checkpoint-mediated G2 arrest. |
siRNA knockdown; overexpression of Set8 PIP-degron mutant; cell cycle analysis; H4K20me1 chromatin immunoprecipitation; Western blot |
Molecular cell |
High |
20932472 21220508
|
| 2010 |
CRL4(CDT2) E3 ubiquitin ligase monoubiquitinates PCNA at Lys164 independently of Rad18 in proliferating cells. This is antagonized by USP1. CRL4(CDT2)-mediated PCNA monoubiquitination promotes translesion DNA synthesis (TLS) in nondamaged cells. |
In vitro ubiquitination assay; siRNA knockdown of CRL4(CDT2) components; PCNA Lys164 mutagenesis; TLS assay |
Molecular cell |
High |
20129063
|
| 2010 |
PR-Set7 is degraded during S phase and after DNA damage via PCNA-coupled CRL4(CDT2)-dependent proteolysis. PR-Set7 interaction with PCNA through a specialized 'PIP degron' domain targets it for this degradation. PR-Set7 is transiently recruited to laser-induced DNA damage sites through its interaction with PCNA, and 53BP1 recruitment to damage sites depends on PR-Set7 catalytic activity. |
Western blot; PIP degron mutagenesis; laser micro-irradiation live imaging; siRNA knockdown; cell cycle analysis |
Molecular cell |
High |
21035370
|
| 2011 |
In Drosophila endocycles, S-phase activates the CRL4(CDT2) ubiquitin ligase, which mediates destruction of E2F1 transcription factor. This creates a molecular oscillator: E2F1 promotes CycE expression and S-phase initiation, S-phase activates CRL4(CDT2), which destroys E2F1, allowing low CDK activity needed for pre-RC formation for the next S-phase. |
Genetic epistasis in Drosophila; computational modeling; overexpression/stabilized E2F1 mutant analysis; genetic tests |
Nature |
High |
22037307
|
| 2011 |
CRL4(CDT2) targets CHK1 for ubiquitin-mediated destruction in the nucleoplasm (not on chromatin) in a PCNA-independent manner, targeting the activated form of CHK1. CDT2-depleted cells show G2 arrest, and CHK1 activity is required for maintaining this G2 arrest. CRL1 and CRL4 both ubiquitinate CHK1 but bind CHK1 in distinct cellular compartments. |
Co-IP; siRNA knockdown; Western blot; cell cycle analysis; compartment fractionation |
Molecular and cellular biology |
Medium |
23109433
|
| 2011 |
MNNG-induced DNA alkylation triggers rapid p21 degradation via the ubiquitin ligase CDT2 and the proteasome. This degradation requires MSH2 but not MLH1, and requires p21's ability to bind PCNA. MNNG induces formation of PCNA complexes with MSH6 and CDT2. When p21 degradation is blocked, MMR protein recruitment to chromatin is reduced. |
SiRNA knockdown; Western blot; p21 PCNA-binding mutant analysis; chromatin fractionation; PCNA Co-IP |
The Journal of biological chemistry |
Medium |
21725088
|
| 2010 |
CRL4(CDT2)-mediated substrate degradation requires two elements in the substrate PIP box: TD amino acid residues within the PIP box and a basic amino acid at +4 (and +3) downstream of the PIP box. An acidic amino acid following these basic residues abolishes degradation. Introducing all required elements into ligase I peptide renders it degradable. |
Chimera constructs of CDT1 and Ligase I; mutagenesis; degradation assays in HeLa cells; electrostatic surface analysis |
Genes to cells : devoted to molecular & cellular mechanisms |
High |
21143559
|
| 2013 |
SCF(FBXO11)/CRL1 interacts with CDT2 and recruits it for proteasomal degradation, thereby restraining CRL4(CDT2) activity. CDK-mediated phosphorylation of CDT2 at Thr464 inhibits recognition by FBXO11. This cross-regulation between SCF(FBXO11) and CRL4(CDT2) is evolutionarily conserved from worms to humans and regulates timing of cell-cycle exit. |
Affinity purification/mass spectrometry; Co-IP; CDT2 Thr464 mutagenesis; degradation assays; C. elegans epistasis |
Molecular cell |
High |
23478441 23478445
|
| 2013 |
CDT2 undergoes autoubiquitylation by CRL4A E3 ubiquitin ligase, and is additionally polyubiquitylated and degraded by CRL1(FBXO11). CRL1(FBXO11)-mediated degradation of CDT2 stabilizes p21 and Set8, which is important during TGF-β response—Set8 induction turns off Smad2 activation. CDT2 downregulation via CRL1(FBXO11) also stimulates epithelial cell migration. |
Co-IP; in vitro ubiquitination assay; siRNA knockdown; TGF-β signaling assays; cell migration assays |
Molecular cell |
High |
23478441 23478445
|
| 2013 |
CRL4(CDT2) promotes degradation of the DNA repair helicase FBH1 after DNA damage in a PCNA- and PIP-degron-dependent manner. FBH1's anti-recombinase activity is partially dependent on its interaction with PCNA. Degradation of FBH1 by CDT2-proteasome pathway facilitates TLS polymerase eta recruitment to chromatin in UV-irradiated cells. |
SiRNA knockdown; non-degradable FBH1 mutant expression; Co-IP; immunofluorescence; chromatin fractionation |
Nucleic acids research |
Medium |
23677613
|
| 2013 |
CRL4(CDT2) regulates the subunit composition of DNA polymerase delta (Pol δ) by targeting the p12 subunit for degradation in response to DNA damage and during S phase entry. The p12 subunit possesses a PIP-degron. Knockdown of CUL4A or CUL4B inhibits p12 degradation. Mutation of the p12 PIP-degron prevents its S phase reduction. |
SiRNA knockdown; PIP-degron mutagenesis; laser scanning cytometry; Western blot; cell synchronization |
The Journal of biological chemistry |
Medium |
23913683
|
| 2014 |
14-3-3 adaptor proteins interact with CDT2 phosphorylated at Thr464 and shield CDT2 from polyubiquitination and proteasomal degradation by FbxO11. Depletion of 14-3-3 proteins promotes FbxO11–CDT2 interaction. The stabilization of CDT2 by 14-3-3 proteins is important for cell cycle progression; depletion of 14-3-3γ leads to G2/M delay partly due to Set8 accumulation. |
Co-IP; phospho-mimicking/blocking CDT2 mutations (T464D/T464A); siRNA knockdown; ubiquitination assay; cell cycle analysis |
Molecular and cellular biology |
Medium |
25154416
|
| 2015 |
CRL4(CDT2) promotes degradation of XPG endonuclease after its action on bulky DNA lesions (UV, cisplatin) during nucleotide excision repair. CDT2 is recruited to UV-damage sites and interacts with XPG in the presence of PCNA. CDT2-mediated XPG degradation is required for subsequent DNA polymerase delta recruitment and gap-filling DNA synthesis (completion of NER). |
SiRNA knockdown; micropore UV irradiation; in situ Proximity Ligation Assay; immunofluorescence; DNA repair synthesis assay |
Cell cycle (Georgetown, Tex.) |
Medium |
25483071
|
| 2015 |
CUL4-DDB1-CDT2 E3 ligase ubiquitinates CRY1 and promotes its degradation in vitro and in vivo. Depletion of DDB1, CDT2, or PCNA leads to CRY1 stabilization in cultured cells and mouse liver. CUL4A-DDB1-CDT2 targets lysine 585 of CRY1, as the CRY1-K585A mutant is resistant to this ubiquitination/degradation. CDT2 depletion or CRY1-K585A overexpression enhances the amplitude of circadian Bmal1 promoter oscillations. |
In vitro ubiquitination assay; siRNA knockdown; CRY1-K585A mutagenesis; mouse liver experiments; luciferase circadian reporter assay |
PloS one |
High |
26431207
|
| 2012 |
ATR kinase phosphorylates CDT2 at S/TQ sites following UV irradiation, and this promotes rapid CDT1 degradation. CDT1 degradation is attenuated by caffeine and in ATR-depleted cells but not in ATM-depleted cells. ATR phosphorylates CDT2 in vitro, mostly in the C-terminal region. |
In vitro kinase assay; siRNA knockdown of ATR/ATM; caffeine inhibition; phosphorylation site mapping; Western blot |
PloS one |
Medium |
23029527
|
| 2018 |
CDT2 bears a C-terminal PIP box (Cdt2PIP) that directly binds PCNA with two orders of magnitude higher affinity than the CDT1 PIP box. X-ray crystallographic structures of PCNA bound to Cdt2PIP and Cdt1PIP show peptides occupying all three binding sites of the trimeric PCNA ring. Mutating Cdt2PIP reduces PCNA interaction, impairs CRL4CDT2 ubiquitination of Cdt1, and leads to CDT1 degradation defects. |
X-ray crystallography; in vitro binding assays; site-directed mutagenesis of Cdt2PIP; in vitro ubiquitination assay; cellular CDT1 degradation assay |
Life science alliance |
High |
30623174
|
| 2018 |
CDT2 contains a conserved C-terminal PIP box-like region required for direct interaction with PCNA. Deletion or mutation of this region abolishes CDT2-PCNA interaction in vitro and in vivo and impairs PCNA-dependent CDT1 degradation in response to DNA damage and during the cell cycle. |
Recombinant protein expression; site-directed mutagenesis; Co-IP in vitro and in vivo; Western blot |
The Journal of biological chemistry |
Medium |
30301766
|
| 2018 |
CDK-mediated phosphorylation of CDT2 (at multiple CDK consensus sites in the C-terminal region) inactivates CRL4(CDT2) by reducing CDT2 affinity for PCNA. Mutation of 18 CDK phosphorylation sites (Cdt2-18A) increases CDT2 affinity for PCNA, enhances co-localization with PCNA foci in S phase, increases poly-ubiquitination of CDT1, and prevents accumulation of Set8 and TDG in late S/G2 phase. |
In vitro phosphorylation assay (cyclinA/Cdk2, cyclinB/Cdk1); CDT2-18A mutagenesis; Co-IP; immunofluorescence; Western blot; cell synchronization |
Genes to cells : devoted to molecular & cellular mechanisms |
High |
29424068
|
| 2018 |
CRL4(DCAF2/CDT2) in dendritic cells regulates NIK stability by promoting NIK polyubiquitination and degradation independently of TRAF3 degradation. DCAF2 deficiency leads to NIK accumulation and RelB nuclear translocation, resulting in increased IL-23 production. DCAF2 DC-conditional knockout mice display increased sensitivity to autoimmune/psoriatic disease. |
Conditional knockout mice; DCAF2 depletion; Co-IP; in vivo ubiquitination assay; transcriptomic analysis; immunological assays |
The Journal of experimental medicine |
High |
30018073
|
| 2018 |
CRL4DCAF2 controls M phase exit in activated T cells. DCAF2 expression is induced upon TCR stimulation. Continuous H4K20me1 modification caused by DCAF2 deficiency inhibits Aurkb expression, which regulates 26S proteasome activity during G2/M phase, causing M phase arrest through proteasome-dependent mechanisms. |
T cell-specific conditional knockout mice; TCR stimulation assays; Western blot; H4K20me1 ChIP; proteasome activity assays; cell cycle analysis |
Journal of autoimmunity |
Medium |
30245026
|
| 2019 |
DTL promotes ubiquitin-dependent degradation of the tumor suppressor PDCD4. DTL physically interacts with PDCD4 (confirmed by Co-IP and immunofluorescence), DTL overexpression accelerates PDCD4 degradation, and in vitro ubiquitination assays demonstrate PDCD4 is degraded through DTL-mediated ubiquitination. |
Affinity-purification mass spectrometry; Co-IP; immunofluorescence; in vitro ubiquitination assay; Western blot; rescue experiments |
Journal of experimental & clinical cancer research : CR |
Medium |
31409387
|
| 2019 |
The C-terminal region of CDT2 contains a DNA-binding domain that enhances CRL4(CDT2) ubiquitin ligase activity. This domain binds double-stranded and single-stranded DNA. Deletion of this domain impairs UV-irradiation-induced CDT1 polyubiquitination and degradation. The N-terminal WD40 region is sufficient for CRL4 complex formation but not full ligase activity. |
Deletion and mutation analysis; DNA-binding assays; in vitro ubiquitination assay; cellular CDT1 degradation assay |
Journal of biochemistry |
Medium |
30649446
|
| 2021 |
CRL4A-DTL ligase complex targets DNA-PKcs for nuclear degradation. Overexpression of CUL4A or DTL reduces NHEJ repair efficiency, increases DSB accumulation, and promotes genomic instability and malignant proliferation in normal cells. In human precancerous lesions, CUL4A expression is negatively correlated with DNA-PKcs. |
Co-IP; Western blot; NHEJ repair assay; overexpression in normal cells; xenograft; immunohistochemistry |
Oncogene |
Medium |
33627782
|
| 2021 |
DDB2 mediates ubiquitination and degradation of CDT2 in a PCNA-independent manner (PIP box of DDB2 is dispensable for CDT2 degradation). Knockdown of DDB2 stabilizes CDT2; overexpression of DDB2 enhances CDT2 ubiquitination and degradation. DDB2-mediated CDT2 degradation indirectly regulates CDT1 protein stability and pre-replication complex assembly. |
Co-IP; in vivo ubiquitination assay; siRNA knockdown; overexpression; PIP box mutagenesis; Western blot; FACS |
Cell & bioscience |
Medium |
33557942
|
| 2017 |
DCAF2 (DTL/CDT2) is a maternal factor essential for genome stability during the first zygotic cell cycle. Dcaf2 knockout in oocytes leads to female infertility; embryos derived from Dcaf2-null oocytes arrest at the 1-2 cell stage with prolonged DNA replication and massive DNA damage accumulation (rereplication). |
Oocyte-specific conditional knockout mice (Dcaf2fl/fl with Cre); embryo development analysis; DNA damage markers; Western blot |
Journal of cell science |
High |
28818995
|
| 2021 |
CRL4(CDT2) ubiquitinates RUVBL1 (pontin/TIP49), promoting its binding to RUVBL2 and to transcription cofactor β-catenin while attenuating its binding to acetyltransferase TIP60. Ubiquitinated RUVBL1 promotes transcriptional regulation of NHEJ repair pathway genes via RUVBL1/2-β-catenin, attenuates TIP60-mediated H4K16 acetylation, and enhances radiation resistance in breast cancer cells. |
Co-IP; ubiquitination assay; Western blot; rescue experiments; in vitro and in vivo radioresistance assays |
Cell death & disease |
Medium |
38609375
|
| 2023 |
DCAF14 controls CDT2 activity at stalled replication forks to protect nascent DNA. Absence of DCAF14 increases proteasomal degradation of CDT2 substrates (CDT1, p21, SET8). At stalled forks, increased CDT2 function causes fork collapse; this is dependent on CDT2 substrate SET8, which blocks nuclease-mediated digestion of nascent DNA. |
SiRNA knockdown; replication fork protection assay; Western blot; rescue experiments with SET8 |
Life science alliance |
Medium |
37940188
|
| 2025 |
Cryo-EM structures of the DCAF2:DDB1:DDA1 complex (3.3 Å), a ligand-bound complex (3.1 Å), and a ternary complex with a covalent PROTAC and BRD4 (3.4 Å) reveal PROTAC-mediated substrate recruitment to DCAF2. CDT2 residue C141 in the WD40 domain engages covalent ligands. DCAF2 demonstrates robust ubiquitination activity in biochemical assays upon covalent PROTAC engagement. |
Cryo-EM structure determination; in vitro ubiquitination assay; cellular TPD (COFFEE method); covalent compound engagement at C141 |
Structure (London, England : 1993) |
High |
41045927
|
| 2025 |
TRIM22 is a novel E3 ubiquitin ligase for CDT2 degradation. In HPV-positive cervical cancer cells, E7-mediated Rb degradation upregulates E2F1, which increases CDT2 transcription; E6-mediated p53 degradation downregulates TRIM22, leading to CDT2 accumulation. CDT2 depletion induces DNA aneuploidy and senescence via stabilization of SET8. |
Co-IP; Western blot; siRNA knockdown; chromatin immunoprecipitation; ubiquitination assays; cell senescence assays |
Neoplasia (New York, N.Y.) |
Medium |
40680432
|
| 2025 |
Mdm2 promotes proteasomal degradation of CDT2 (independently of p53), thereby attenuating CRL4(CDT2) activity. Mdm2-mediated CDT2 degradation stabilizes p21, Set8, and CDT1 at the G2/M phase. Loss of Mdm2 causes G2/M delay and decreased proliferation largely through increased CDT2 and subsequent decreased p21 levels. |
SiRNA/overexpression experiments; Western blot; ubiquitination assays; cell cycle analysis |
bioRxivpreprint |
Low |
bio_10.1101_2025.07.09.663887
|
| 2024 |
DCAF2 maintains proliferation and differentiation of progenitor spermatogonia by targeting p21 and thymine DNA glycosylase (TDG) for degradation during S phase. Germ cell-specific Dcaf2 knockout causes accumulation of p21 and TDG, reduced cell proliferation, increased DNA damage, apoptosis, failure of meiosis initiation, and male infertility. |
Germ cell-specific conditional knockout mice (Dcaf2fl/fl x Stra8-Cre); Western blot; immunofluorescence; overexpression of p21/TDG; apoptosis assays |
Cell proliferation |
High |
38837535
|
| 2025 |
DTL mediates K48-linked ubiquitination and proteasomal degradation of SMAD4 in pancreatic cancer cells. This activates the Wnt/β-catenin pathway to promote tumorigenesis. Knockdown of DTL suppresses tumor growth and metastasis in vivo. |
Co-IP; in vitro ubiquitination assay (K48 linkage); Western blot; siRNA knockdown; xenograft model |
International journal of biological macromolecules |
Medium |
41203163
|
| 2024 |
Under hypoxia, HIF-1α transcriptionally activates DTL expression. DTL then promotes ubiquitination and degradation of SLTM (SAFB-like transcription modulator), relieving transcriptional repression of Notch1 and activating the Notch pathway to promote HCC proliferation, metastasis, and sorafenib resistance. |
RNA-sequencing; Co-IP; ubiquitination assay; Western blot; ChIP; orthotopic tumor model; siRNA knockdown |
Cell death & disease |
Medium |
39384740
|
| 2024 |
DTL promotes K11-linked ubiquitination-mediated degradation of ARGLU1 in head and neck squamous cell carcinoma. This activates the CSL-dependent Notch signaling pathway. siARGLU1 blocks the inhibitory effects of DTL knockdown on HNSCC cells. |
Mass spectrometry; Co-IP; ubiquitination assay (K11 linkage); siRNA rescue experiments; in vivo tumor growth assay |
International journal of biological macromolecules |
Medium |
38218284
|
| 2025 |
DTL ubiquitinates and degrades PROX1 in hepatocytes during ischemia/reperfusion injury. DTL-mediated PROX1 degradation increases polyunsaturated fatty acid (PUFA) levels, triggering ferroptosis and exacerbating hepatic I/R injury. Sex-specific differential DTL expression in mice determines sex disparity of I/R-induced ferroptosis. |
Multi-omics analysis; Co-IP; ubiquitination assay; Western blot; in vivo I/R mouse model; ferroptosis markers |
Cell reports |
Medium |
40560731
|