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The gene dca7 (systematic name SPBC17D11.08) in the fission yeast Schizosaccharomyces pombe (strain 972 / ATCC 24843) encodes a protein of predicted DCAF7-like function (UniProt accession O74763). The protein is annotated as an "uncharacterized WD repeat-containing protein" and possesses multiple WD40 repeats (InterPro: IPR001680, IPR019775), a WD40/YVTN repeat-like domain superfold (IPR015943, IPR036322), and critically, a DCAF7-like domain (IPR045159). This domain architecture strongly identifies it as the fission yeast ortholog of the well-characterized mammalian DCAF7/WDR68/HAN11 protein. In Saccharomyces cerevisiae, the DCAF7 ortholog is Ypl247c (ananthapadmanabhan2023insightsfromthe pages 6-7, glenewinkel2016theadaptorprotein pages 8-10), and in Candida albicans, it is Orf19.384 (pinsky2024geneticanalysisof pages 1-2, pinsky2024geneticanalysisof pages 6-9).
Important caveat: No primary literature was identified that directly characterizes SPBC17D11.08/dca7 in S. pombe. The functional annotation presented here is inferred from the extensively characterized orthologs in other organisms, supported by the conserved domain architecture and the deep evolutionary conservation of the DCAF7 protein family across eukaryotes.
The mammalian DCAF7/WDR68 protein is a 342 amino acid protein containing five WD40 repeats that fold into a seven-blade β-propeller structure (yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2). This β-propeller fold is characteristic of WD40 domain proteins and provides a large, versatile surface for mediating multiple protein-protein interactions simultaneously (glenewinkel2016theadaptorprotein pages 10-12). DCAF7 possesses no intrinsic catalytic activity; rather, it functions exclusively as a scaffolding and adaptor protein (glenewinkel2016theadaptorprotein pages 1-2). The WD40 domain contains conserved WDxR motifs, which are positioned on the solvent-exposed bottom surface of the propeller and are critical for binding to DDB1, the adaptor subunit of the CUL4-based E3 ubiquitin ligase complex (lee2007dcafsthemissing pages 2-3, buscaino2012raf1isa pages 4-6). The S. pombe protein SPBC17D11.08 is predicted to adopt a similar β-propeller architecture based on domain annotations.
The DCAF7 family proteins have two major and well-established molecular functions:
DCAF7 functions as a substrate recognition subunit (substrate receptor) of the CUL4-DDB1-ROC1 (CRL4) E3 ubiquitin ligase complex (lee2007dcafsthemissing pages 1-2, higa2007stealingthespotlight pages 1-2). In this role, DCAF7 directly binds DDB1 through its WDxR motifs and recruits specific protein substrates for ubiquitination and subsequent proteasomal degradation. The known substrates targeted by DCAF7 through the CRL4 complex include:
DNA Ligase I (LigI): DCAF7 directly interacts with human DNA Ligase I and targets it for ubiquitylation at four lysine residues (K79, K192, K226, K376), promoting its proteasomal degradation particularly during growth arrest induced by serum starvation (peng2016humandnaligase pages 5-6).
Menin: DCAF7 facilitates the ubiquitylation and degradation of menin, an essential component of the KMT2A and KMT2B H3K4 methyltransferase complexes, through CRL4B. This is relevant to leukemia biology as menin-dependent KMT2A fusion proteins drive acute myeloid and lymphoblastic leukemias (nakagawa2025cul4basedubiquitinligases pages 14-15).
ERCC1-XPF: DCAF7 is required for maintaining cellular levels of the ERCC1-XPF heterodimer, which is essential for nucleotide excision repair (NER). Depletion of DCAF7 causes time-dependent downregulation of ERCC1-XPF and suppresses NER activity, impairing repair of UV-induced DNA damage, although this role appears partly independent of the canonical CUL4-DDB1 pathway (kawara2019dcaf7isrequired pages 5-7).
Influenza A virus PA subunit: DCAF7 acts as a substrate receptor for CRL4B to promote K48-linked polyubiquitination of the viral polymerase subunit PA at K609, targeting it for degradation and thereby restricting influenza A virus replication (higa2007stealingthespotlight pages 1-2).
The second major function of DCAF7 is as a scaffold/adaptor for dual-specificity tyrosine phosphorylation-regulated kinases (DYRKs), particularly DYRK1A and DYRK1B (class 1 DYRKs), as well as HIPK2 (glenewinkel2016theadaptorprotein pages 1-2, glenewinkel2016theadaptorprotein pages 2-3, glenewinkel2016theadaptorprotein pages 8-10). DCAF7 binds to a conserved 12-amino acid motif (residues 93–104 in human DYRK1A) in the N-terminal domain of class 1 DYRKs, independently of kinase activity (glenewinkel2016theadaptorprotein pages 8-10, glenewinkel2016theadaptorprotein pages 3-5). This interaction is essential for:
Protein stability: DCAF7 is required for maintaining normal cellular levels of DYRK1A and DYRK1B. Loss of DCAF7 leads to reduced DYRK1A protein levels through a mechanism that appears independent of proteasome-mediated degradation (yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2, yu2019acomplexbetween pages 4-5).
Substrate recruitment and kinase activity: DCAF7 tethers DYRK1A to its substrates. A critical example is the DYRK1A-DCAF7 complex's role in phosphorylating the C-terminal domain (CTD) of RNA Polymerase II at both Ser2 and Ser5 positions. DCAF7 independently binds Pol II and greatly enhances the DYRK1A-Pol II interaction, enabling the kinase to co-migrate with Pol II along gene loci and promote transcription of myogenic genes including MYOG, MYH2, and CAV3 (yu2019acomplexbetween pages 1-1, yu2019acomplexbetween pages 5-5, yu2019acomplexbetween pages 7-8, yu2019acomplexbetween pages 4-5).
Signal integration: DCAF7 also mediates the interaction of the adenovirus E1A oncoprotein with DYRK1A and HIPK2, forming ternary complexes that enable E1A hyperphosphorylation (glenewinkel2016theadaptorprotein pages 8-10, glenewinkel2016theadaptorprotein pages 3-5).
The following table summarizes the dual functional roles of DCAF7/WDR68 across organisms:
| Organism/System | Function/Role | Mechanism | Known Substrates/Interactors | Biological Process | Key References |
|---|---|---|---|---|---|
| Human | CRL4 substrate receptor (DCAF7) | WD40 protein acting as a substrate-recognition factor for CUL4-DDB1 E3 ligase; directly binds DNA ligase I and promotes its ubiquitylation and proteasomal degradation | DNA ligase I (LigI); CUL4; DDB1 | DNA replication/repair protein turnover, especially during proliferation arrest or serum starvation | (peng2016humandnaligase pages 5-6, yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2) |
| Human | Regulator of ERCC1-XPF stability linked to DNA repair | Maintains ERCC1-XPF protein levels and supports nucleotide excision repair; effect appears at least partly independent of canonical CUL4-DDB1 activity | ERCC1-XPF | Nucleotide excision repair and UV-damage response | (kawara2019dcaf7isrequired pages 5-7) |
| Human | Putative/validated CRL4B substrate receptor in chromatin regulation | Functions in CRL4B complexes that control chromatin regulators; reported to promote ubiquitylation/degradation of menin and implicated in KDM6B regulation | Menin; KDM6B; CRL4B components | Histone methylation control, transcriptional regulation, leukemia-relevant chromatin pathways | (nakagawa2025cul4basedubiquitinligases pages 14-15) |
| Human | CRL4B antiviral substrate receptor | Recruits influenza A viral PA polymerase subunit to CRL4B for K48-linked polyubiquitylation and degradation | Influenza A PA; CUL4B; DDB1 | Host antiviral defense against influenza A virus | (higa2007stealingthespotlight pages 1-2) |
| Human | DYRK1A/DYRK1B kinase scaffold | Stable WD40 scaffold that binds the N-terminus of class 1 DYRKs, stabilizes kinase abundance, and recruits substrates | DYRK1A; DYRK1B | Developmental signaling, protein stability, proliferation-differentiation balance | (yu2019acomplexbetween pages 4-5, yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2, glenewinkel2016theadaptorprotein pages 8-10) |
| Human | HIPK2/DYRK1A adaptor | Simultaneously binds kinases and client proteins through distinct interaction surfaces; mediates ternary complex formation | HIPK2; DYRK1A; adenoviral E1A | Signal integration, kinase substrate recruitment, viral-host interaction | (glenewinkel2016theadaptorprotein pages 8-10, glenewinkel2016theadaptorprotein pages 1-2, glenewinkel2016theadaptorprotein pages 10-12, glenewinkel2016theadaptorprotein pages 3-5) |
| Human muscle cells | Transcriptional scaffold for DYRK1A on RNA polymerase II | DCAF7 binds Pol II and tethers DYRK1A to the CTD, enabling Ser2/Ser5 phosphorylation and robust transcription of myogenic genes | DYRK1A; RNA polymerase II CTD; MYOG/MYH2/CAV3 loci | Myogenesis and differentiation-dependent transcription | (yu2019acomplexbetween pages 1-1, yu2019acomplexbetween pages 11-12, yu2019acomplexbetween pages 5-5, yu2019acomplexbetween pages 7-8, yu2019acomplexbetween pages 4-5, yu2019acomplexbetween pages 1-2) |
| Human/HepG2 and Drosophila | Scaffold in IRS1-PI3K-AKT-FOXO signaling | Acts as an IRS1 interactor/scaffold supporting AKT activation; depletion increases FOXO1 nuclear localization and cell-cycle arrest gene expression | IRS1; AKT; FOXO1 | Cell proliferation and growth control | (frendocumbo2022dcaf7regulatescell pages 4-6, frendocumbo2022dcaf7regulatescell pages 6-8) |
| Budding yeast (S. cerevisiae) | Conserved DYRK-family partner | Ortholog YPL247C interacts with Yak1, supporting the idea that the DCAF7–DYRK partnership is ancestral | Yak1; YPL247C | Stress signaling and conserved kinase-WD40 regulation | (ananthapadmanabhan2023insightsfromthe pages 6-7, glenewinkel2016theadaptorprotein pages 8-10) |
| Candida albicans | Fungal DYRK/Yak1 scaffold partner | WDR68/DCAF7 ortholog Orf19.384 forms a conserved complex with Yak1; each affects the other’s localization and likely substrate targeting | Yak1; Orf19.384; Sfl1 | Filamentation and yeast-to-hypha differentiation | (pinsky2024geneticanalysisof pages 1-2, pinsky2024geneticanalysisof pages 6-9, pinsky2024geneticanalysisof pages 10-12) |
| Schizosaccharomyces pombe context | Inferred DCAF7-like WD40 scaffold/substrate receptor role | The specific SPBC17D11.08 protein is uncharacterized, but S. pombe CUL4 systems use WD40 DCAFs with WDxR-like docking logic in both canonical CRL4 and CLRC-type complexes, supporting an inferred adaptor/scaffold role for the DCAF7-like protein | By inference: CUL4/DDB1-like machinery; more directly, Raf1/Raf2 are example S. pombe DCAFs in CLRC | Likely protein-protein scaffolding and/or regulated substrate recruitment; precise pathway unknown for SPBC17D11.08 | (lee2007dcafsthemissing pages 1-2, lee2007dcafsthemissing pages 2-3, buscaino2012raf1isa pages 6-8, buscaino2012raf1isa pages 2-4, nakagawa2025cul4basedubiquitinligases pages 6-8) |
Table: This table summarizes the two major molecular roles of DCAF7/WDR68 across systems: as a CRL4-family substrate receptor in ubiquitin-dependent proteolysis and as a WD40 scaffold/adaptor for DYRK-family kinase signaling. It is useful for inferring likely functions of the poorly characterized S. pombe DCAF7-like protein from conserved ortholog biology.
DCAF7/WDR68 localizes to both the nucleus and cytoplasm, with its distribution regulated by its kinase binding partners. The DYRK1A-DCAF7 complex is predominantly nuclear, with nuclear localization driven by a nuclear localization signal (NLS) in DYRK1A that is distinct from the DCAF7 binding site (yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2, glenewinkel2016theadaptorprotein pages 1-2). DCAF7 nuclear access is functionally important; in zebrafish, nuclear localization of WDR68 is required for proper craniofacial development (ananthapadmanabhan2023insightsfromthe pages 6-7). Co-expression of DCAF7 with the adenoviral E1A protein can cause redistribution from the nucleus to the cytoplasm, suggesting that protein-protein interactions modulate its localization (glenewinkel2016theadaptorprotein pages 8-10). In Candida albicans, the DCAF7 ortholog Orf19.384 requires the Yak1 kinase for proper nuclear accumulation, and reciprocally, Yak1 requires Orf19.384 for cytoplasmic localization (pinsky2024geneticanalysisof pages 6-9). The cytosolic anchoring protein FAM53C can also retain the DYRK1A-DCAF7 complex in the cytoplasm in an inactive state.
For the S. pombe protein SPBC17D11.08, no direct localization data were identified, but by analogy it is expected to localize to both the nucleus and cytoplasm, likely with nuclear accumulation dependent on interaction with a DYRK-family kinase partner.
In the context of the CRL4 E3 ubiquitin ligase, DCAF7 participates in protein quality control and regulated proteolysis. The CUL4-DDB1 ubiquitin ligase system is well-conserved in S. pombe, where CUL4 (Pcu4) participates in both the CLRC complex (using Rik1 as a DDB1-like adaptor and Raf1/Dos1 as a DCAF for heterochromatin formation) and a canonical CRL4 complex (using Ddb1 and the DCAF Cdt2 to target substrates such as Spd1, Cdt1, and Epe1 for degradation) (nakagawa2025cul4basedubiquitinligases pages 6-8, buscaino2012raf1isa pages 6-8, buscaino2012raf1isa pages 2-4). The SPBC17D11.08 protein, by virtue of its DCAF7-like domain and WD40 repeats, is predicted to function within this ubiquitin ligase framework, potentially assembling with Ddb1 or a DDB1-like adaptor to recruit specific substrates for ubiquitination.
DCAF7 is a central scaffolding component in DYRK1A-mediated signaling pathways including transcription regulation via Pol II CTD phosphorylation (yu2019acomplexbetween pages 1-1, yu2019acomplexbetween pages 1-2), cell proliferation through IRS1-PI3K-AKT-FOXO1 signaling (frendocumbo2022dcaf7regulatescell pages 4-6, frendocumbo2022dcaf7regulatescell pages 6-8), and developmental differentiation. In fungi, the DCAF7-DYRK kinase partnership (Ypl247c-Yak1 in budding yeast, Orf19.384-Yak1 in C. albicans) is conserved and regulates stress-responsive signaling and cell differentiation pathways (ananthapadmanabhan2023insightsfromthe pages 6-7, pinsky2024geneticanalysisof pages 1-2, pinsky2024geneticanalysisof pages 10-12).
Through its CRL4 substrate receptor function, DCAF7 regulates levels of key DNA repair proteins. It maintains ERCC1-XPF levels required for NER (kawara2019dcaf7isrequired pages 5-7) and targets DNA Ligase I for degradation during growth arrest (peng2016humandnaligase pages 5-6), linking DCAF7 to genome maintenance pathways.
The DCAF7/WDR68 protein family is deeply conserved across eukaryotes, with the DYRK kinase-DCAF7 interaction representing an ancestral feature of the DYRK family that was subsequently lost in class 2 DYRKs (glenewinkel2016theadaptorprotein pages 8-10). The following table summarizes known orthologs:
| Organism | Gene/Protein Name | Kinase Partner (DYRK family) | Known Functions | References |
|---|---|---|---|---|
| Saccharomyces cerevisiae | Ypl247c | Yak1 | Conserved DCAF7/WDR68 ortholog; directly interacts with Yak1 and is implicated in stress-response signaling, supporting an ancestral DYRK–WD40 partnership in fungi and animals. | (ananthapadmanabhan2023insightsfromthe pages 6-7, glenewinkel2016theadaptorprotein pages 8-10) |
| Schizosaccharomyces pombe | SPBC17D11.08 / dca7 | Not directly established; inferred likely partner is a DYRK-family kinase by orthology | DCAF7-like WD40-repeat protein predicted from domain architecture; no direct functional study found for this specific fission yeast protein, so function is inferred as a conserved adaptor/scaffold or substrate receptor from orthologs and from conserved DCAF logic in S. pombe CUL4 systems. | (ananthapadmanabhan2023insightsfromthe pages 6-7, glenewinkel2016theadaptorprotein pages 8-10, buscaino2012raf1isa pages 6-8, nakagawa2025cul4basedubiquitinligases pages 6-8) |
| Candida albicans | Orf19.384 | Yak1 | Forms a conserved kinase–WD40 pair with Yak1; required for hyphal development/filamentation, affects reciprocal subcellular localization with Yak1, and likely helps connect Yak1 to transcriptional regulators such as Sfl1. | (pinsky2024geneticanalysisof pages 1-2, pinsky2024geneticanalysisof pages 6-9, pinsky2024geneticanalysisof pages 10-12) |
| Caenorhabditis elegans | SWAN-1 / SWAN-2 | DYRK-family association reported for DCAF7 orthologs broadly; specific kinase partner not defined in the retrieved evidence | Conserved DCAF7 orthologs involved in osmotic stress regulation and developmental/essential cellular processes, supporting broad conservation of DCAF7-family signaling roles. | (ananthapadmanabhan2023insightsfromthe pages 6-7) |
| Drosophila melanogaster | Wap (wings apart) | Mnb (Minibrain; DYRK-family kinase) | Conserved DYRK-binding WD40 protein involved in developmental processes; cited as part of the evolutionarily conserved DCAF7–DYRK interaction module. | (glenewinkel2016theadaptorprotein pages 8-10) |
| Danio rerio (zebrafish) | wdr68 | Dyrk1b and functionally linked to Dyrk1a-family signaling | Required for craniofacial development; regulates endothelin-1-dependent jaw cartilage development, and nuclear localization is functionally important for developmental patterning. | (glenewinkel2016theadaptorprotein pages 2-3, ananthapadmanabhan2023insightsfromthe pages 6-7, glenewinkel2016theadaptorprotein pages 8-10) |
| Human | DCAF7 / WDR68 / HAN11 | DYRK1A, DYRK1B; also binds HIPK2 | Best-characterized ortholog; dual-function WD40 protein acting as (i) scaffold/adaptor for DYRK1A/DYRK1B and HIPK2, including recruitment of substrates such as RNA polymerase II, and (ii) CRL4 substrate receptor regulating protein stability; implicated in development, transcription, proliferation, DNA repair, and signaling. | (glenewinkel2016theadaptorprotein pages 8-10, glenewinkel2016theadaptorprotein pages 1-2, yu2019acomplexbetween pages 4-5, yousefelahiyeh2018dcaf7wdr68isrequired pages 1-2, kawara2019dcaf7isrequired pages 5-7, peng2016humandnaligase pages 5-6, yu2019acomplexbetween pages 1-1) |
Table: This table summarizes the evolutionary conservation of DCAF7/WDR68-family proteins from fungi to humans, emphasizing their recurrent association with DYRK-family kinases. It is useful for inferring likely functions of the poorly characterized S. pombe SPBC17D11.08/dca7 protein from better-studied orthologs.
While SPBC17D11.08/dca7 itself is uncharacterized, S. pombe has well-studied CUL4-based ubiquitin ligase complexes. The CLRC complex (Cul4-Rik1-Raf1/Raf2-Clr4) uses WD40 DCAF proteins (Raf1/Dos1) with WDxR motifs to dock onto the DDB1-like adaptor Rik1, coupling E3 ubiquitin ligase activity with histone H3K9 methylation for heterochromatin formation (buscaino2012raf1isa pages 6-8, buscaino2012raf1isa pages 2-4, buscaino2012raf1isa pages 4-6, buscaino2012raf1isa pages 1-2). CLRC catalyzes H3K14 ubiquitylation that is required for subsequent H3K9 methylation (nakagawa2025cul4basedubiquitinligases pages 6-8). The canonical S. pombe CRL4 complex (Cul4-Ddb1-Cdt2) targets substrates including Spd1, Cdt1, and Epe1 for degradation (nakagawa2025cul4basedubiquitinligases pages 6-8). SPBC17D11.08/dca7 likely operates within this established CUL4 ubiquitin ligase framework, potentially as an additional DCAF substrate receptor recruiting specific, as-yet-unidentified substrates.
The S. pombe protein encoded by dca7 (SPBC17D11.08, UniProt O74763) is an uncharacterized member of the DCAF7 family of WD40 repeat-containing proteins. Based on its conserved DCAF7-like domain architecture and extensive characterization of orthologs in other organisms, the protein is predicted to have two primary molecular functions: (1) as a substrate receptor for the CUL4-DDB1 E3 ubiquitin ligase, recognizing specific proteins for ubiquitin-dependent proteasomal degradation; and (2) as a scaffolding protein for DYRK-family kinases, facilitating kinase-substrate interactions and potentially regulating kinase protein levels and localization. The protein likely localizes to both the nucleus and cytoplasm, with its distribution potentially governed by interaction with a DYRK-family kinase partner. In the broader biological context of S. pombe, DCAF7-like proteins are expected to participate in ubiquitin-proteasome-mediated regulation of protein stability, with potential roles in cell cycle regulation, stress response signaling, and chromatin biology. Direct experimental characterization of SPBC17D11.08 in S. pombe remains an important gap in the current understanding of this protein.
References
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