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DCAF11 (gene symbol: DCAF11, UniProt accession: Q8TEB1) is also known as WDR23 (WD repeat-containing protein 23), consistent with the UniProt annotation provided (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). This protein functions as a substrate receptor within the Cullin-RING E3 ubiquitin ligase (CRL4) complex in human cells and contains WD40 repeat domains that facilitate protein-protein interactions (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). The gene matches the description of a DDB1- and CUL4-associated factor with WD40 domains as specified in the UniProt entry.
DCAF11 functions as a substrate receptor subunit within the multicomponent CRL4 E3 ubiquitin ligase complex, which is composed of CUL4A or CUL4B (cullin scaffold proteins), RBX1 (RING-box protein 1), DDB1 (DNA damage-binding protein 1 adaptor), and DCAF11 as the substrate recognition module (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4). The CRL4^DCAF11 complex catalyzes the transfer of ubiquitin from E2 ubiquitin-conjugating enzymes to specific protein substrates recognized by DCAF11, thereby marking these substrates for proteasomal degradation or functional modification (chen2017crl4bdcaf11e3ligase pages 1-2, lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4).
Structurally, DCAF11 contains seven WD40 repeats, which form a β-propeller structure that mediates substrate recognition and binding (lo2017wdr23regulatesnrf2 pages 2-4). This architecture allows DCAF11 to serve as a versatile adaptor that links the core CRL4 machinery to diverse cellular substrates depending on post-translational modifications and cellular context.
DCAF11 recognizes multiple substrates through distinct binding motifs and phosphorylation-dependent mechanisms. A comprehensive summary of known DCAF11 substrates is provided below:
| Substrate name | Binding motif/domain | Type of ubiquitination | Biological function | Key references |
|---|---|---|---|---|
| NRF2/NFE2L2 | DIDLID sequence within the Neh2 domain; distinct from KEAP1-binding DLG/ETGE motifs | Proteolytic; DCAF11/WDR23 promotes NRF2 turnover and suppresses NRF2-dependent transcription | Negative regulation of oxidative stress and xenobiotic-response programs; controls cytoprotective gene expression independently of KEAP1-CUL3 | (lo2017wdr23regulatesnrf2 pages 1-2, park2019tfebactivatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4) |
| p21Cip1 (CDKN1A) | Direct interaction reported; specific DCAF11-binding degron not defined in the cited study | Proteolytic; CRL4B^DCAF11 ubiquitinates p21 at K16, K154, K161, and K163 | Promotes cell-cycle progression, especially S-phase progression, in osteosarcoma cells by reducing the CDK inhibitor p21 | (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4) |
| SLBP (Stem-loop binding protein) | Phosphorylation-dependent recognition of the N-terminal region containing Thr60/Thr61; Thr61 phosphorylation is critical | Proteolytic; CRL4-DCAF11 mediates end-of-S-phase degradation | Terminates histone mRNA metabolism/histone synthesis at the S/G2 transition and supports cell viability | (djakbarova2016ddb1andcul4 pages 1-4, djakbarova2016ddb1andcul4 pages 4-8) |
| GEN-1 (GEN1 Holliday junction resolvase) | Evolutionarily conserved WDR23 substrate; precise human binding motif not specified in the cited context | Likely proteolytic or inhibitory turnover-associated ubiquitination in the nucleus; isoform-dependent regulation described | DNA damage repair/Holliday junction resolution and regulation of double-strand break repair capacity | (spatola2019nuclearandcytoplasmic pages 1-2) |
| IDE (Insulin-degrading enzyme) | No evidence in the cited study for direct physical binding to DCAF11/WDR23; regulation is indirect via NRF2, a direct WDR23 target | Indirect effect rather than demonstrated direct substrate ubiquitination; WDR23 loss increases IDE expression through NRF2-dependent transcription | Insulin homeostasis and hepatic insulin clearance; altered IDE levels change circulating insulin and insulin signaling | (duangjan2024hepaticwdr23proteostasis pages 1-3) |
| Influenza A PB2 protein | Unconventional bimodal recruitment involving both DDB1 adaptor and DCAF substrate receptors including DCAF11; precise PB2 degron not defined | Non-proteolytic K29-linked ubiquitination | Proviral regulation of influenza replication; supports optimal viral cycle progression and virion production | (karim2020nonproteolytick29linkedubiquitination pages 1-2) |
Table: This table summarizes the main proteins reported to be regulated by the human DCAF11/WDR23-containing CRL4 ubiquitin ligase system, including recognition features, ubiquitination outcome, and biological role. It is useful for distinguishing direct proteolytic substrates from indirect or non-proteolytic regulatory effects.
The primary characterized substrates include:
NRF2 (Nuclear factor E2-related factor 2): DCAF11 binds to the DIDLID sequence within the Neh2 domain of NRF2, a motif that is distinct from the KEAP1-binding DLG and ETGE motifs (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). This enables DCAF11 to regulate NRF2 protein stability independently of the canonical KEAP1-CUL3 pathway. The WDR23-DDB1-CUL4 axis promotes NRF2 ubiquitination and degradation, thereby negatively regulating the expression of antioxidant response element (ARE)-containing genes involved in cellular cytoprotection and oxidative stress response (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). Recent studies demonstrate that loss of WDR23 stabilizes NRF2 and enhances expression of NRF2 target genes in both mouse hippocampus and human cell models (duangjan2024hepaticwdr23proteostasis pages 1-3, liu2024wdr23mediatesnrf2 pages 1-6).
p21Cip1 (CDKN1A): In osteosarcoma cells, the CRL4B^DCAF11 complex specifically ubiquitinates the cyclin-dependent kinase inhibitor p21Cip1 at lysine residues K16, K154, K161, and K163, but not at K75 or K141 (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4). This targeted degradation of p21 promotes S-phase progression and cell cycle advancement. Knockdown of CUL4B, DDB1, or DCAF11 attenuates p21 ubiquitination, leading to S-phase arrest and decreased proliferation in osteosarcoma cells (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4).
SLBP (Stem-loop binding protein): DCAF11 mediates the degradation of SLBP at the end of S phase through a phosphorylation-dependent mechanism (djakbarova2016ddb1andcul4 pages 1-4, djakbarova2016ddb1andcul4 pages 4-8). SLBP, which binds to the 3' stem-loop structure of replication-dependent histone mRNAs, is phosphorylated at Thr61 by cyclin A/Cdk1 and subsequently at Thr60 by CK2 (djakbarova2016ddb1andcul4 pages 4-8). The doubly phosphorylated SLBP is then recognized by DCAF11, ubiquitinated by the CRL4-DCAF11 complex, and degraded by the proteasome (djakbarova2016ddb1andcul4 pages 1-4, djakbarova2016ddb1andcul4 pages 4-8). This degradation is essential for terminating bulk histone synthesis at the S/G2 boundary and maintaining genomic stability.
GEN-1 (Holliday junction resolvase): DCAF11/WDR23 has been identified as a regulator of GEN-1, an evolutionarily conserved enzyme involved in DNA double-strand break repair (spatola2019nuclearandcytoplasmic pages 1-2). Studies in C. elegans and mammalian systems demonstrate that nuclear and cytoplasmic isoforms of WDR23 differentially affect GEN-1 activity and DNA repair processes, suggesting context-dependent regulatory mechanisms (spatola2019nuclearandcytoplasmic pages 1-2).
Insulin-Degrading Enzyme (IDE): Recent work establishes that hepatic WDR23 regulates insulin homeostasis indirectly through control of IDE expression (duangjan2024hepaticwdr23proteostasis pages 1-3). Loss of WDR23 leads to NRF2 stabilization, which in turn drives transcriptional upregulation of IDE, resulting in increased insulin degradation, reduced circulating insulin levels, and impaired insulin responses in mouse models (duangjan2024hepaticwdr23proteostasis pages 1-3). Genetic variation in WDR23 was significantly associated with altered hemoglobin A1C (HbA1c) levels in a large human aging cohort, supporting WDR23 as a molecular determinant of metabolic health (duangjan2024hepaticwdr23proteostasis pages 1-3).
Influenza A PB2 protein: DCAF11, along with DCAF12L1, mediates non-proteolytic K29-linked ubiquitination of the influenza A virus PB2 replication protein (karim2020nonproteolytick29linkedubiquitination pages 1-2). This atypical ubiquitin modification does not target PB2 for degradation but rather promotes optimal viral replication and virion production, representing a proviral function of the CRL4-DCAF11 complex (karim2020nonproteolytick29linkedubiquitination pages 1-2).
DCAF11/WDR23 is expressed as two major protein isoforms with distinct subcellular distributions (lo2017wdr23regulatesnrf2 pages 2-4, spatola2019nuclearandcytoplasmic pages 1-2):
Isoform 1 (UniProtKB Q8TEB1-2; 546 amino acids, 61.7 kDa) localizes primarily to the cytoplasm and regulates cytoplasmic substrates including NRF2 (lo2017wdr23regulatesnrf2 pages 2-4).
Isoform 2 (UniProtKB Q8TEB1-1; 520 amino acids, 58.8 kDa) is enriched in the nucleus but can also be found in the cytoplasm when overexpressed (lo2017wdr23regulatesnrf2 pages 2-4). This nuclear isoform is positioned to regulate nuclear substrates such as SLBP and GEN-1 (spatola2019nuclearandcytoplasmic pages 1-2).
The dual subcellular localization of DCAF11 isoforms enables coordinate regulation of substrates in both the cytoplasm and nucleus, expanding the functional repertoire of the CRL4^DCAF11 E3 ligase system. Importantly, the subcellular distribution of WDR23 does not change in response to oxidative stress, suggesting constitutive localization patterns (lo2017wdr23regulatesnrf2 pages 2-4). This contrasts with KEAP1, which is predominantly cytoplasmic, highlighting how DCAF11 can regulate NRF2 in compartments not accessible to KEAP1-CUL3 (lo2017wdr23regulatesnrf2 pages 2-4).
DCAF11 participates in multiple critical cellular processes through its substrate-specific activities:
DCAF11 is a key negative regulator of the NRF2-mediated oxidative stress response pathway, operating independently of the canonical KEAP1-CUL3 system (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). By promoting NRF2 degradation, DCAF11 controls the expression of antioxidant enzymes (e.g., GSR, GSTA1, HO-1, GSTM1), drug-metabolizing enzymes (e.g., CYP3A4, CYP1A1), and other cytoprotective factors (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4, liu2024wdr23mediatesnrf2 pages 1-6). Loss of WDR23 in mice leads to NRF2 stabilization, increased expression of antioxidant defense proteins, and enhanced oxidative stress resistance (liu2024wdr23mediatesnrf2 pages 1-6). This regulatory axis is particularly important in the nervous system, where WDR23-mediated NRF2 proteostasis influences hippocampal cytoprotective capacity and age-related behavioral changes (liu2024wdr23mediatesnrf2 pages 1-6).
Notably, transcription factor TFEB represses DCAF11 expression at both the protein and mRNA levels, leading to NRF2 stabilization and activation even under non-oxidative stress conditions (park2019tfebactivatesnrf2 pages 1-2). This establishes a TFEB-DCAF11-NRF2 regulatory axis that coordinates autophagy-lysosomal and antioxidant response pathways (park2019tfebactivatesnrf2 pages 1-2).
DCAF11 plays essential roles in controlling cell cycle transitions, particularly at the G1/S and S/G2 boundaries:
S-phase progression: By degrading p21Cip1, DCAF11 relieves inhibition of cyclin-CDK complexes, thereby promoting DNA replication and S-phase progression (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4). Dysregulation of this pathway can contribute to uncontrolled proliferation in osteosarcoma and potentially other cancers.
S/G2 transition: DCAF11-mediated degradation of SLBP at the end of S phase is critical for terminating histone biosynthesis (djakbarova2016ddb1andcul4 pages 1-4, djakbarova2016ddb1andcul4 pages 4-8). This ensures proper coupling of histone production with DNA replication and prevents deleterious imbalances between DNA and histone levels that could compromise genomic stability (djakbarova2016ddb1andcul4 pages 4-8). Ectopic expression of S/G2-stable SLBP mutants (Thr61/Ala) is significantly more toxic to cells compared to wild-type SLBP, underscoring the importance of DCAF11-mediated SLBP degradation for cell viability (djakbarova2016ddb1andcul4 pages 4-8).
Through regulation of GEN-1, a Holliday junction resolvase, DCAF11 influences the cellular capacity for DNA double-strand break repair (spatola2019nuclearandcytoplasmic pages 1-2). The nuclear WDR-23B isoform appears to negatively regulate GEN-1 activity, most likely through promoting protein turnover, while the cytoplasmic WDR-23A isoform may perform proteasome-independent regulatory functions (spatola2019nuclearandcytoplasmic pages 1-2). This differential regulation by spatially distinct DCAF11 isoforms ensures appropriate coordination of DNA repair processes.
Recent work has established a hepatic WDR23-NRF2-IDE regulatory axis that controls insulin clearance and metabolic balance (duangjan2024hepaticwdr23proteostasis pages 1-3). In Wdr23 knockout mice, loss of WDR23 leads to:
- Increased IDE expression through NRF2-mediated transcriptional activation
- Reduced circulating insulin levels
- Impaired insulin signaling and insulin sensitivity (particularly in male mice)
- Dysregulated phosphorylation of insulin signaling proteins (IRS-1, AKT2, MAPK, FoxO, mTOR) (duangjan2024hepaticwdr23proteostasis pages 1-3)
Importantly, genetic variation in WDR23 was significantly associated with altered HbA1c levels in a large human cohort, supporting WDR23 as a molecular determinant of metabolic health and a potential biomarker for diabetes risk (duangjan2024hepaticwdr23proteostasis pages 1-3).
DCAF11 contributes to influenza A virus replication through non-proteolytic K29-linked ubiquitination of the viral PB2 replication protein (karim2020nonproteolytick29linkedubiquitination pages 1-2). This atypical ubiquitin modification promotes optimal viral cycle progression and maximal virion production without targeting PB2 for degradation, representing a proviral host-pathogen interaction (karim2020nonproteolytick29linkedubiquitination pages 1-2).
Recent 2023–2024 chemical biology studies position DCAF11/WDR23 as an increasingly actionable CRL4 substrate receptor for targeted protein degradation, extending the E3-ligase toolbox beyond CRBN and VHL. Drug-like covalent DCAF11 ligands and DCAF11-recruiting degraders were reported to drive degradation of proteins such as BRD4 and to show antitumor activity in cells and, for some compounds, in mouse xenograft models, supporting expert views that DCAF11 is now a bona fide TPD platform rather than merely a poorly characterized adaptor. URLs: https://doi.org/10.1038/s41467-023-43657-6 ; https://doi.org/10.1371/journal.pbio.3002550 ; https://doi.org/10.1158/1535-7163.MCT-24-0219 (xue2023discoveryofa pages 1-2, wang2024alkenyloxindoleis pages 1-2, parker2024discoveryofmonovalent pages 1-2)
Mechanistically, these advances build on foundational evidence that DCAF11/WDR23 is a DDB1-CUL4-associated substrate receptor that can recognize and regulate specific targets, most notably NRF2/NFE2L2, independently of the canonical KEAP1-CUL3 pathway. This has made DCAF11 especially interesting to experts because it links degrader chemistry directly to a biologically validated stress-response node with implications for cancer resistance, redox biology, and cytoprotection. URLs: https://doi.org/10.1371/journal.pgen.1006762 ; https://doi.org/10.1038/s41598-019-50877-8 (lo2017wdr23regulatesnrf2 pages 1-2, park2019tfebactivatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4)
Authoritative 2024 work further strengthens the view that WDR23 is not only relevant to degradation technology but also to physiology: loss of WDR23 increased IDE expression through NRF2-dependent transcription, reduced circulating insulin, altered insulin signaling, and was associated with altered HbA1c in a large human aging cohort, highlighting a plausible metabolic-disease connection. In parallel, 2024 nervous-system studies reinforced that WDR23-mediated NRF2 proteostasis shapes hippocampal antioxidant programs, underscoring broader tissue-specific roles in oxidative-stress adaptation. URLs: https://doi.org/10.1007/s11357-024-01196-y ; https://doi.org/10.1016/j.mad.2024.111914 (duangjan2024hepaticwdr23proteostasis pages 1-3, liu2024wdr23mediatesnrf2 pages 1-6)
Overall, the current expert consensus from these studies is that DCAF11/WDR23 should be viewed as a multifunctional CRL4 substrate receptor at the intersection of proteostasis, oxidative-stress control, cell-state regulation, and emerging therapeutic modality design. The major open question is no longer whether DCAF11 is druggable, but how broadly and selectively its endogenous substrate-recognition biology can be harnessed across cancer, neurodegeneration, and metabolic disease contexts. (xue2023discoveryofa pages 1-2, duangjan2024hepaticwdr23proteostasis pages 1-3, liu2024wdr23mediatesnrf2 pages 1-6, wang2024alkenyloxindoleis pages 1-2, parker2024discoveryofmonovalent pages 1-2)
Blockquote: This blockquote summarizes recent expert-relevant developments on DCAF11/WDR23 across targeted protein degradation, oxidative-stress regulation, and metabolic disease links. It is useful as a concise synthesis of why DCAF11 has become a notable E3 ligase substrate receptor in current research.
A major recent development is the recognition of DCAF11 as a druggable E3 ligase substrate receptor for targeted protein degradation (TPD) strategies. Several 2023–2024 studies have established DCAF11 as a viable alternative to the commonly used CRBN and VHL E3 ligases in proteolysis-targeting chimera (PROTAC) design:
Covalent DCAF11 Ligands: Xue et al. (2023) discovered that arylidene-indolinone compounds, which contain tempered α,β-unsaturated electrophiles, covalently bind to specific cysteine residues in DCAF11, including the highly conserved C460 (xue2023discoveryofa pages 1-2). These drug-like compounds recruit the CRL4^DCAF11 E3 ligase to degrade target proteins conjugated to them, enabling TPD applications (xue2023discoveryofa pages 1-2).
DCAF11-recruiting PROTACs: Wang et al. (2024) demonstrated that alkenyl oxindole-based heterobifunctional molecules recruit the CRL4^DCAF11 complex to induce ubiquitin-proteasome-mediated degradation of BRD4 and other targets (wang2024alkenyloxindoleis pages 1-2). Using pooled CRISPR interference screening, they confirmed that JQ1-alkenyl oxindole conjugates require DCAF11 for substrate degradation activity (wang2024alkenyloxindoleis pages 1-2). The lead compound HL435 showed promising antitumor activity both in vitro and in mouse xenograft models (wang2024alkenyloxindoleis pages 1-2).
Monovalent DCAF11 Degraders: Parker et al. (2024) identified monovalent "direct" degraders of BRD4 that bind to the target protein and induce its degradation through endogenous recruitment of DCAF11 (parker2024discoveryofmonovalent pages 1-2). The lead compound PLX-3618 demonstrated selective BRD4 degradation, potent antitumor activity in vivo, and formation of a BRD4:PLX-3618:DCAF11 ternary complex. Mutational studies provided mechanistic insights into DCAF11-mediated degradation, and CRISPR screens confirmed that DCAF11 is required for PLX-3618 activity (parker2024discoveryofmonovalent pages 1-2).
These advances position DCAF11 as an increasingly actionable E3 ligase for TPD modalities, expanding the toolbox beyond CRBN and VHL. This is particularly important for overcoming acquired resistance to CRBN-based degraders, as DCAF11-based PROTACs retain activity in CRBN-resistant cell lines (wang2024alkenyloxindoleis pages 1-2, parker2024discoveryofmonovalent pages 1-2).
DCAF11 has been implicated in tumorigenesis with context-dependent roles:
Potential tumor suppressor: DCAF11 has been suggested as a potential tumor suppressor in some contexts, possibly through its role in regulating cell cycle checkpoints and DNA damage repair (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4).
Oncogenic potential: Overexpression of CUL4B and DCAF11 in osteosarcoma cells promotes p21 degradation and uncontrolled proliferation, suggesting oncogenic functions in specific cancer types (chen2017crl4bdcaf11e3ligase pages 1-2, chen2017crl4bdcaf11e3ligase pages 2-4).
Chemo-resistance: Dysregulation of NRF2 due to loss of KEAP1 is a hallmark of several chemo- and radiation-resistant cancers (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4). The identification of WDR23 as an alternative NRF2 regulator suggests that modulating WDR23 activity could provide therapeutic benefit in KEAP1-mutant cancers where the canonical regulatory pathway is impaired (lo2017wdr23regulatesnrf2 pages 1-2, lo2017wdr23regulatesnrf2 pages 2-4).
Metabolic disease: The association of WDR23 genetic variation with altered HbA1c levels in human populations supports its relevance to type 2 diabetes risk and metabolic syndrome (duangjan2024hepaticwdr23proteostasis pages 1-3).
The WDR23/DCAF11 regulatory system is evolutionarily conserved from C. elegans to humans (lo2017wdr23regulatesnrf2 pages 2-4, spatola2019nuclearandcytoplasmic pages 1-2). In C. elegans, WDR-23 regulates SKN-1 (the worm ortholog of mammalian NRF2) through the CUL-4-DDB-1 E3 ligase complex, controlling oxidative stress responses and lifespan (lo2017wdr23regulatesnrf2 pages 2-4, spatola2019nuclearandcytoplasmic pages 1-2). Notably, C. elegans lacks a KEAP1 homolog, suggesting that the WDR23-mediated regulatory pathway represents an ancient mechanism of cytoprotective transcription factor control that predates the evolution of KEAP1 (lo2017wdr23regulatesnrf2 pages 2-4).
The high degree of conservation between worm WDR-23 and human DCAF11/WDR23, particularly in the C-terminal WD40 repeat domain, supports the use of C. elegans as a model system to elucidate conserved regulatory mechanisms relevant to human physiology and disease (lo2017wdr23regulatesnrf2 pages 2-4).
DCAF11 (WDR23) is a multifunctional substrate receptor within the CRL4 E3 ubiquitin ligase complex that regulates diverse cellular processes including oxidative stress response, cell cycle progression, DNA damage repair, metabolic homeostasis, and host-pathogen interactions. Its ability to recognize multiple substrates through distinct binding motifs and phosphorylation-dependent mechanisms, combined with its dual nuclear-cytoplasmic localization through alternative isoforms, enables DCAF11 to coordinate proteostasis across cellular compartments.
The identification of DCAF11 as a KEAP1-independent regulator of NRF2 has significant implications for understanding oxidative stress biology and for developing therapeutic strategies in cancers with KEAP1 mutations. Recent advances establishing DCAF11 as a druggable E3 ligase for targeted protein degradation further highlight its potential as a therapeutic target and tool for chemical biology.
Future research directions include further defining the complete substrate repertoire of DCAF11, elucidating the structural basis of substrate recognition, characterizing tissue-specific functions, and developing selective DCAF11 modulators for therapeutic applications in cancer, neurodegeneration, and metabolic disease.
References
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