{"gene":"CNOT4","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1994,"finding":"NOT4 physically interacts with NOT1 and NOT3 in the yeast two-hybrid assay, and NOT1/NOT2/NOT3/NOT4 form a ~500 kDa nuclear complex that acts as a global negative regulator of RNA Pol II transcription, preferentially repressing TC-element-dependent transcription.","method":"Two-hybrid interaction, biochemical co-fractionation, allele-specific suppression genetics","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two-hybrid plus co-fractionation plus genetic suppression, single lab but three orthogonal approaches","pmids":["7926748"],"is_preprint":false},{"year":1999,"finding":"In the yeast CCR4-NOT complex, NOT4 (and NOT3) interact with the C-terminal region (residues 1490–2108) of NOT1, placing NOT4 peripheral to the CCR4-CAF1-NOT1-(NOT2,NOT5) core; NOT4 and NOT3 do not significantly affect the association of CCR4, CAF1, and NOT1 with each other.","method":"Co-immunoprecipitation, two-hybrid, deletion mapping, genetic analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with deletion mapping and genetic validation, single lab","pmids":["10490603"],"is_preprint":false},{"year":2000,"finding":"Human NOT4 contains a C4C4-type RING finger (residues 1–78) that coordinates two zinc ions in a cross-brace manner via cysteine residues; the NMR solution structure shows an alpha-helix and three long loops, overall similar to C3HC4 RING fingers but with distinct secondary structural elements in non-conserved regions.","method":"Heteronuclear NMR structure determination with 113Cd-substitution to confirm cross-brace zinc coordination","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution NMR structure with metal-substitution validation, well-defined atomic coordinates","pmids":["11087754"],"is_preprint":false},{"year":2004,"finding":"The N-terminal RING finger domain of CNOT4 acts as an E3 ubiquitin ligase that specifically interacts with the ubiquitin-conjugating enzyme UbcH5B; NMR chemical shift perturbation mapping identified UbcH5B residues contacting the CNOT4 RING domain, and HADDOCK docking revealed the structural basis of E2/E3 specificity differing from the c-Cbl/UbcH7 interface.","method":"NMR chemical shift perturbation, HADDOCK computational docking, biochemical mutagenesis","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR mapping combined with structural modeling and mutagenesis in a single rigorous study","pmids":["15062086"],"is_preprint":false},{"year":2005,"finding":"The two zinc-binding sites within the C4C4 RING domain of CNOT4 show differential metal exchange rates; NMR backbone dynamics analysis shows this differential stability arises from differences in site accessibility and electrostatic interactions, and CNOT4 RING is less flexible than the p44 RING domain.","method":"NMR backbone dynamics (Zn2+/Cd2+ exchange), relaxation measurements","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR with metal exchange assays, single lab, structural characterization without functional mutagenesis","pmids":["15890366"],"is_preprint":false},{"year":2010,"finding":"Not4, together with Ubc4, is required for ubiquitin-mediated destabilization of Cdc17 (the catalytic subunit of DNA polymerase-α) in yeast; disruption of this turnover pathway causes hydroxyurea sensitivity and synthetic dosage lethality upon Cdc17 overexpression.","method":"Genetic deletion analysis, protein stability assays, growth phenotype assays (HU sensitivity, SDL)","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple phenotypic readouts and epistasis between Ubc4, Not4, and Mcm10, single lab","pmids":["20660159"],"is_preprint":false},{"year":2011,"finding":"Not4 E3 ligase is required for proper proteasome assembly: in not4Δ cells the regulatory particle (RP) and core particle (CP) form aberrant salt-resistant complexes, and Ecm29 (a proteasome chaperone) becomes ubiquitinated and degraded. Not4 associates with RP species in purified proteasome holoenzyme and interacts with Ecm29 to maintain normal proteasome integrity.","method":"Co-immunoprecipitation, proteasome purification/fractionation, in vivo ubiquitination assay, deletion genetics","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — purified proteasome biochemistry, Co-IP, in vivo ubiquitination, multiple orthogonal methods; replicated in the broader literature","pmids":["21321079"],"is_preprint":false},{"year":2012,"finding":"Not4 ubiquitin ligase ubiquitinates Rps7A (but not its paralogue Rps7B) in vivo and in vitro; ubiquitinated Rps7A is found only in 80S and polysome fractions. Not4 is itself detectable in polysome fractions, and optimal presence of Not5 in polysomes depends on Not4.","method":"In vitro ubiquitination assay, polysome fractionation/sedimentation, deletion genetics, protein aggregation analysis","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination reconstitution plus polysome fractionation and genetic epistasis, single lab with multiple orthogonal methods","pmids":["22243599"],"is_preprint":false},{"year":2012,"finding":"Not4p ubiquitin ligase mediates H2O2-induced destruction of cyclin C via K48-linked polyubiquitination, directing it to the 26S proteasome. Cyclin C must translocate from nucleus to cytoplasm (requiring the cell-wall-integrity MAPK module and phospholipase C) before Not4p-dependent degradation; a cytoplasm-restricted cyclin C derivative is still subject to Not4p-dependent destruction.","method":"In vitro polyubiquitination assay with K48 linkage-specific analysis, genetic deletion, subcellular localization by microscopy, epistasis with MAPK/PLC pathway mutants","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination with K48 specificity, localization experiments, pathway epistasis, multiple orthogonal methods","pmids":["22421358"],"is_preprint":false},{"year":2012,"finding":"The nuclear E3 ubiquitin ligase Not4 binds to Yap1 in an oxidant-stimulated manner and is required for proteasome-dependent Yap1 degradation after oxidative stress; Yap1 degradation requires nuclear localization and DNA-binding ability of Yap1 but not chromatin binding.","method":"Co-immunoprecipitation, genetic screen of ubiquitin pathway mutants, proteasome inhibitor treatment, localization-restricted Yap1 mutant analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus genetic and mutant analysis, single lab","pmids":["22707721"],"is_preprint":false},{"year":2014,"finding":"Not4 associates with polysomes and contributes to translational repression of transcripts that cause transient ribosome stalling; absence of Not4 impairs global translational repression upon nutrient withdrawal, enhances expression of arrested nascent polypeptides, and causes constitutive protein folding stress and aggregation.","method":"Polysome fractionation, protein aggregation assays, pulse-chase translation analysis, genetic epistasis with decapping machinery mutants","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome fractionation plus multiple functional assays, single lab","pmids":["25971775"],"is_preprint":false},{"year":2014,"finding":"Not4 promotes protein quality control independently of the Ccr4 deadenylase module; clearance of aberrant proteins by Not4 operates at least in part via the proteasome.","method":"Genetic deletion of NOT4 vs CCR4, protein aggregation assays, proteasome activity measurements, epistasis analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple readouts, single lab","pmids":["24465968"],"is_preprint":false},{"year":2015,"finding":"Human CNOT4 controls PAF1 protein levels by promoting K48-linked polyubiquitination of PAF1 and its subsequent degradation by the 26S proteasome; this degradation requires nuclear localization of PAF1 but not chromatin binding.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, NLS-deficient PAF1 mutant analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus mutant localization analysis, single lab","pmids":["25933433"],"is_preprint":false},{"year":2017,"finding":"CNOT4 acts as an E3 ubiquitin ligase for influenza A virus nucleoprotein (NP): CNOT4 interacts with NP in cells and ubiquitinates NP in vitro without affecting NP protein stability; monoubiquitination at residues K184, K227, and K273 in the RNA-binding groove of NP promotes viral RNA replication.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, CNOT4 knockdown/overexpression, mass spectrometry ubiquitination site mapping, arginine substitution mutagenesis","journal":"mBio","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution, mutagenesis of specific ubiquitination sites, multiple orthogonal methods in a single study","pmids":["28536288"],"is_preprint":false},{"year":2018,"finding":"Not4 selectively ubiquitinates Rpt5 during proteasomal ATPase (Rpt ring) assembly; Not4 competes with chaperones Nas2 and Hsm3 for access to Rpt5 ubiquitination sites, which are sterically occluded by these chaperones. Rpt5 ubiquitination does not destabilize the ring but blocks incorporation of Rpn1 ubiquitin receptor and Ubp6 deubiquitinase, thereby acting as an assembly checkpoint.","method":"In vitro ubiquitination reconstitution, structural modeling using known Rpt-chaperone co-crystal structures, proteasome assembly intermediate analysis, deletion/competition biochemistry","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of ubiquitination plus structural analysis plus biochemical assembly intermediates, multiple orthogonal methods","pmids":["30530678"],"is_preprint":false},{"year":2018,"finding":"Upon mitochondrial damage, CNOT4 is recruited to the stalled ribosome/mRNA complex on the mitochondrial outer membrane and ubiquitinates ABCE1; this K63-linked poly-ubiquitin signal on ABCE1 recruits autophagy receptors to the mitochondrial outer membrane to initiate mitophagy downstream of PINK1 signaling.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, genetic epistasis in Drosophila PINK1 model, ribosome fractionation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus in vivo ubiquitination plus Drosophila genetic epistasis, replicated across cell and animal models","pmids":["29861391"],"is_preprint":false},{"year":2018,"finding":"The Not4 RING domain is required for Ccr4-Not association with RNA Pol II, while the conserved RRM-C domain (RNA recognition motif and C3H1 domain) affects a specific subset of Pol II-regulated genes without affecting Ccr4-Not/Pol II association; individual RING or RRM-C mutations fail to replicate proteasomal defects seen in not4Δ cells, but combined RING/RRM-C mutations do.","method":"Domain mutagenesis, transcriptome analysis (RNA-seq), ChIP (Pol II occupancy), proteasome integrity assay, Co-IP","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis with multiple functional readouts, single lab","pmids":["29802328"],"is_preprint":false},{"year":2019,"finding":"Metazoan NOT4 contains a conserved CAF40-binding motif (CBM) in its C-terminal region that directly binds the CAF40 subunit of the CCR4-NOT complex; crystal structures of the CBM-CAF40 complex show this binding surface is mutually exclusive with Roquin or Bag of marbles binding. CAF40 depletion or structure-guided mutagenesis of the NOT4-CAF40 interface impairs NOT4-dependent decay of tethered reporter mRNAs.","method":"Crystal structure determination, NMR/binding assays, mutagenesis, tethered mRNA reporter decay assay, CAF40 depletion","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional mRNA decay assay, multiple orthogonal methods in one study","pmids":["30692204"],"is_preprint":false},{"year":2021,"finding":"Not4 and Not5 modulate translation elongation dynamics and change ribosome A-site dwelling occupancy in a codon-dependent fashion; Not4 E3 ligase activity (Rps7A ubiquitination) and a moonlighting function of Rli1 enable Not4-dependent translation of polyarginine stretches. Not5 resides in punctate loci (condensates) that co-purify with ribosomes and Rli1 but exclude eIF5A.","method":"Ribosome profiling, polysome fractionation, in vivo ubiquitination, microscopy, genetic deletion and epistasis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling plus biochemical fractionation plus in vivo ubiquitination plus localization, multiple orthogonal methods","pmids":["34469733"],"is_preprint":false},{"year":2021,"finding":"In male germ cells, CNOT4 functions as an mRNA adaptor of the CCR4-NOT complex by targeting mRNAs to CNOT7 for deadenylation/degradation; conditional Cnot4 knockout in mouse male germ cells causes defective DNA double-strand break repair, impaired XY chromosome crossover, and infertility.","method":"Conditional knockout mouse model, RNA-seq, poly(A) tail analysis, immunofluorescence for meiotic markers","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple molecular and cellular phenotypic readouts plus mechanistic mRNA adaptor function, single lab with multiple orthogonal methods","pmids":["34026442"],"is_preprint":false},{"year":2021,"finding":"Ccr4, Caf1, and Not4 function at a post-ubiquitylation step in the ubiquitin-proteasome system to promote degradation of ubiquitinated substrates; Not4, Ccr4, and Caf1 bind cellular ubiquitin conjugates, and loss of any of these three genes impairs UPS-mediated degradation of a UFD pathway substrate in yeast.","method":"UFD pathway substrate degradation assays, ubiquitin conjugate binding assays, genetic deletion, proteasome interaction assays","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical binding assays plus functional degradation assays, single lab","pmids":["33727038"],"is_preprint":false},{"year":2021,"finding":"Yeast Not4 localizes to cytoplasmic foci after cellular stress; the C-terminal 211 amino acids are required for proper localization to stress-induced cytoplasmic foci and for Not4 function in stress response gene regulation, while the last 120 amino acids are dispensable.","method":"Fluorescence microscopy (subcellular localization), domain deletion analysis, stress response gene expression assays","journal":"FEMS microbiology letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization imaging with domain deletion functional analysis, single lab","pmids":["34338747"],"is_preprint":false},{"year":2023,"finding":"Not4 promotes ribosome pausing during MMF1 mRNA translation, enabling co-translational docking of MMF1 mRNA to mitochondria via the MMF1 nascent chain mitochondrial targeting sequence, Egd1 chaperone, Om14, and the co-translational import machinery; Not4 also ubiquitinates the Egd1 chaperone, and this pathway (Mito-ENCay) additionally requires Caf130, Cis1, autophagy, and no-go-decay to limit MMF1 overexpression.","method":"Ribosome profiling, polysome fractionation, in vivo ubiquitination assay, mitochondrial fractionation, genetic epistasis with autophagy/no-go-decay mutants","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical and genetic approaches in a single lab, ribosome profiling plus fractionation plus ubiquitination","pmids":["37094076"],"is_preprint":false},{"year":2023,"finding":"Depletion of Not1 and Not4 inversely affects mRNA solubility: depletion of Not4 solubilizes mRNAs with lower non-optimal codon content and higher expression, while depletion of Not1 solubilizes mitochondrial mRNAs; insoluble mRNAs are enriched for ribosomes dwelling at non-optimal codons and show higher proportion of co-translational degradation.","method":"Ribosome profiling of soluble vs insoluble mRNA fractions, transcriptome-wide mRNA decay analysis, genetic depletion","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ribosome profiling with fractionation, single lab, multiple orthogonal methods","pmids":["36803582"],"is_preprint":false},{"year":2023,"finding":"CNOT4 facilitates ubiquitination and proteasomal degradation of PAF1 in non-small cell lung cancer cells, as confirmed by co-immunoprecipitation of CNOT4 with PAF1 and in vivo ubiquitination assays.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, CNOT4 overexpression in NSCLC cells","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay in cell lines, mechanistically similar to prior yeast/human data","pmids":["37493105"],"is_preprint":false},{"year":2023,"finding":"CNOT4 directly binds YAP and promotes its ubiquitination and proteasomal degradation; the drug hydnocarpin binds both YAP and CNOT4 (confirmed by microscale thermophoresis and DARTS assay) and exploits this pathway to degrade YAP in triple negative breast cancer cells.","method":"Microscale thermophoresis, DARTS assay, ubiquitination assay, proteasome inhibitor rescue, co-immunoprecipitation","journal":"China journal of Chinese materia medica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, binding confirmed by biophysical assay but ubiquitination mechanistic detail is limited","pmids":["37802875"],"is_preprint":false},{"year":2024,"finding":"CNOT4 undergoes regulatory K63-linked ubiquitination in a CNOT4-dependent manner (auto-ubiquitination context) and ubiquitinates ZNF598; this ubiquitination is required for ZNF598-mediated resolution of stalled ribosomes and protection against mitochondrial stress.","method":"In vivo ubiquitination assay with K63-linkage specificity, CNOT4 overexpression/depletion, Drosophila genetic models, ribosome stalling assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ubiquitination with linkage specificity plus Drosophila genetic epistasis, single lab","pmids":["38388640"],"is_preprint":false},{"year":2024,"finding":"TNKS1BP1 interacts with TRIM21 and mediates ubiquitination of CNOT4 at K239 via K48 and K6 linkage, leading to CNOT4 degradation; this promotes inhibition of JAK2/STAT3 pathway activity, thereby inducing lipid accumulation and inhibiting autophagy in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, ubiquitination assay with site-specific mutant (K239), western blotting, genetic knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus site-specific ubiquitination mutagenesis, single lab","pmids":["39019859"],"is_preprint":false},{"year":2025,"finding":"Human CNOT4 does not form a stable complex with CCR4-NOT by standard biochemical co-purification but associates with the complex in cells as shown by BioID proximity labeling; depletion of CNOT4 does not affect CCR4-NOT complex integrity but paradoxically accelerates global mRNA decay, opposite to the effect of CNOT1 depletion. mRNA stability changes in CCR4-NOT-depleted cells correlate with codon optimality.","method":"Auxin-induced degron depletion, BioID proximity labeling, transcriptome-wide mRNA abundance and decay measurement, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — acute depletion system plus transcriptome-wide analysis plus BioID, single lab with multiple orthogonal methods","pmids":["41161383"],"is_preprint":false},{"year":2025,"finding":"In Drosophila salivary gland cells, Cnot4 ubiquitin ligase mediates ubiquitination of secretory granules (glue granules), marking them for crinophagic degradation (lysosomal fusion); loss of Cnot4 impairs glue granule fusion with lysosomes, while Cnot4 overexpression induces premature crinophagy.","method":"Genetic loss-of-function, overexpression, fluorescence microscopy of granule-lysosome fusion, in vivo ubiquitination","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic LOF and GOF with direct localization imaging, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.09.24.678350"],"is_preprint":true},{"year":2025,"finding":"In mouse/human cells, CNOT4 ubiquitinates and destabilizes TENT5C poly(A) polymerase, providing a mechanism by which the CCR4-NOT deadenylase complex limits the stability of a cytoplasmic polyadenylation enzyme during erythropoiesis.","method":"Proteomic interaction assay, ubiquitination/protein stability analysis, genetic depletion","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — reported as a finding within a preprint focused on TENT5C; mechanistic detail for CNOT4 is limited to a single observation","pmids":["bio_10.1101_2024.11.14.623596"],"is_preprint":true},{"year":2025,"finding":"USP4 deubiquitinase directly binds PAF1, removes K48-linked polyubiquitin chains added by CNOT4, and thereby stabilizes PAF1 protein levels; this antagonism between USP4 and CNOT4 controls PAF1 abundance and NSCLC tumor growth in vivo.","method":"Co-immunoprecipitation, K48-linkage-specific ubiquitination assay, proteasome inhibition, xenograft mouse model","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus linkage-specific ubiquitination plus in vivo xenograft rescue, single lab","pmids":["41857610"],"is_preprint":false},{"year":2025,"finding":"Heterozygous deletion of Cnot4 in mice impairs PPARγ transcriptional activity: Cnot4 Het fibroblasts show decreased PPARγ binding to target gene promoters in response to rosiglitazone, reducing adipogenic gene expression and adipocyte differentiation capacity.","method":"Cnot4 heterozygous knockout mouse, ChIP for PPARγ promoter binding, gene expression analysis, in vitro adipocyte differentiation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional differentiation assay in genetic mouse model, single lab","pmids":["40424271"],"is_preprint":false}],"current_model":"CNOT4 is a RING-domain E3 ubiquitin ligase (using UbcH5B as its cognate E2) that functions both as a peripheral/non-constitutive subunit of the CCR4-NOT complex—associating via a conserved CAF40-binding motif in metazoans—and as an autonomous ubiquitin ligase; it ubiquitinates diverse substrates including Rps7A (monoubiquitination promoting ribosome function), Rpt5 (proteasome assembly checkpoint), cyclin C (K48-linked, stress-induced degradation), Yap1, PAF1 (polyubiquitination and proteasomal degradation), ABCE1 (K63-linked, mitophagy signaling), ZNF598 (ribosome quality control), and viral nucleoprotein NP; it associates with translating ribosomes to regulate co-translational quality control and translation elongation dynamics at non-optimal codons, promotes proteasome assembly via Ecm29, modulates mRNA solubility/decay in a direction opposite to CNOT1, and is itself regulated by TRIM21/TNKS1BP1-mediated ubiquitination and degradation."},"narrative":{"mechanistic_narrative":"CNOT4 (yeast Not4) is a RING-finger E3 ubiquitin ligase that bridges ubiquitin-dependent protein quality control, translation, and the CCR4-NOT mRNA-degradation machinery [PMID:7926748, PMID:15062086]. Its N-terminal RING domain coordinates two zinc ions in a cross-brace arrangement and selects UbcH5B as its cognate ubiquitin-conjugating enzyme, an E2/E3 interface structurally distinct from the c-Cbl/UbcH7 paradigm [PMID:11087754, PMID:15062086]. CNOT4 was first defined as a peripheral subunit of the CCR4-NOT complex, associating via the C-terminal region of NOT1 in yeast and, in metazoans, through a conserved CAF40-binding motif whose interface is shared with Roquin and Bag-of-marbles [PMID:10490603, PMID:30692204]; in human cells it does not stably co-purify with the complex but associates in proximity-labeling and, when depleted, accelerates global mRNA decay opposite to CNOT1, while in mouse germ cells it acts as an mRNA adaptor delivering transcripts to CNOT7 for deadenylation [PMID:34026442, PMID:41161383]. As an autonomous ligase CNOT4 ubiquitinates a wide substrate range with linkage- and outcome-specific consequences: K48-linked polyubiquitination and proteasomal degradation of stress-induced cyclin C, PAF1, and YAP [PMID:22421358, PMID:25933433, PMID:37802875]; monoubiquitination of the ribosomal protein Rps7A and of influenza nucleoprotein NP [PMID:22243599, PMID:28536288]; and K63-linked ubiquitination of ABCE1 to signal mitophagy and of ZNF598 during ribosome quality control [PMID:29861391, PMID:38388640]. CNOT4 associates with translating ribosomes, where it shapes elongation dynamics and A-site dwelling at non-optimal codons and couples ribosome pausing to co-translational protein quality control and degradation [PMID:25971775, PMID:34469733, PMID:36803582]. It also governs proteasome homeostasis, maintaining proteasome integrity through Ecm29 and acting as an assembly checkpoint by ubiquitinating Rpt5 in competition with assembly chaperones [PMID:21321079, PMID:30530678]. CNOT4 abundance is itself controlled by TRIM21/TNKS1BP1-mediated K48/K6 ubiquitination, and its degradation of PAF1 is antagonized by the deubiquitinase USP4 [PMID:39019859, PMID:41857610].","teleology":[{"year":1994,"claim":"Established NOT4 as a physical and functional member of a nuclear NOT complex repressing RNA Pol II transcription, anchoring it to a multiprotein regulatory machine before any enzymatic role was known.","evidence":"Two-hybrid, co-fractionation and suppressor genetics in yeast","pmids":["7926748"],"confidence":"Medium","gaps":["No biochemical activity assigned to NOT4 itself","Architecture within the complex undefined"]},{"year":1999,"claim":"Mapped NOT4 to a peripheral position on the CCR4-CAF1-NOT1 core, showing it is dispensable for core integrity and distinguishing it from constitutive subunits.","evidence":"Co-IP, two-hybrid and deletion mapping in the yeast CCR4-NOT complex","pmids":["10490603"],"confidence":"Medium","gaps":["Functional consequence of peripheral association unclear","Does not address metazoan binding mode"]},{"year":2000,"claim":"Solved the C4C4 RING-finger structure and cross-brace zinc coordination, providing the structural basis for a catalytic identity.","evidence":"Heteronuclear NMR with 113Cd substitution","pmids":["11087754"],"confidence":"High","gaps":["No E2 partner identified","No substrate or ligase activity demonstrated"]},{"year":2004,"claim":"Defined UbcH5B as the cognate E2 and established the molecular basis of E2/E3 specificity, confirming CNOT4 as a bona fide E3 ligase.","evidence":"NMR chemical-shift mapping, HADDOCK docking and mutagenesis","pmids":["15062086"],"confidence":"High","gaps":["Physiological substrates not yet known","Linkage type not determined"]},{"year":2010,"claim":"Linked Not4 ligase activity with Ubc4 to in vivo turnover of a DNA polymerase subunit, the first cellular substrate context.","evidence":"Yeast deletion genetics, stability assays and HU-sensitivity phenotypes","pmids":["20660159"],"confidence":"Medium","gaps":["Direct ubiquitination of Cdc17 not reconstituted","Linkage type unresolved"]},{"year":2011,"claim":"Revealed a role in proteasome homeostasis, with Not4 maintaining proteasome integrity through Ecm29.","evidence":"Proteasome purification, Co-IP, in vivo ubiquitination and deletion genetics in yeast","pmids":["21321079"],"confidence":"High","gaps":["Mechanism by which Not4 prevents aberrant RP-CP complexes incomplete","Direct Ecm29 ubiquitination not fully defined"]},{"year":2012,"claim":"Identified ribosome-associated and stress-responsive substrates (Rps7A monoubiquitination; K48 degradation of cyclin C; Yap1 turnover), establishing CNOT4 as a multi-substrate ligase coupled to translation and oxidative stress.","evidence":"In vitro and in vivo ubiquitination, polysome fractionation, localization and pathway epistasis in yeast","pmids":["22243599","22421358","22707721"],"confidence":"High","gaps":["Functional outcome of Rps7A monoubiquitination on the ribosome not resolved","How substrate selection is achieved unknown"]},{"year":2014,"claim":"Connected Not4 to co-translational quality control, showing it represses translation of stall-prone transcripts and clears aberrant proteins independently of the Ccr4 deadenylase module.","evidence":"Polysome fractionation, aggregation assays, pulse-chase and genetic epistasis in yeast","pmids":["25971775","24465968"],"confidence":"Medium","gaps":["Direct ribosome-bound substrates of repression unidentified","Mechanistic coupling of ligase activity to translational repression unclear"]},{"year":2015,"claim":"Extended substrate range to human PAF1, demonstrating K48-linked polyubiquitination and proteasomal degradation requiring nuclear but not chromatin localization.","evidence":"Co-IP, ubiquitination assay and NLS-mutant analysis in human cells","pmids":["25933433"],"confidence":"Medium","gaps":["Upstream signal controlling PAF1 degradation unknown","Physiological context not yet defined"]},{"year":2017,"claim":"Showed CNOT4 ubiquitinates a viral substrate, monoubiquitinating influenza NP in its RNA-binding groove to promote viral replication without altering NP stability.","evidence":"Co-IP, in vitro ubiquitination, MS site mapping and arginine-substitution mutagenesis","pmids":["28536288"],"confidence":"High","gaps":["Host benefit/cost of this activity unresolved","Whether host substrates share this monoubiquitination mode unknown"]},{"year":2018,"claim":"Defined linkage-specific signaling roles: K63 ubiquitination of ABCE1 to trigger mitophagy and Rpt5 ubiquitination as a proteasome assembly checkpoint that blocks Rpn1/Ubp6 incorporation.","evidence":"In vitro reconstitution, structural modeling, Drosophila PINK1 epistasis and ribosome fractionation","pmids":["29861391","30530678"],"confidence":"High","gaps":["Switch between K48 and K63 output not mechanistically explained","Recruitment to damaged mitochondria incompletely defined"]},{"year":2018,"claim":"Dissected domain contributions, showing the RING domain mediates Ccr4-Not/Pol II association while the RRM-C domain controls a distinct gene subset, with proteasomal defects requiring both.","evidence":"Domain mutagenesis, RNA-seq, Pol II ChIP and proteasome assays in yeast","pmids":["29802328"],"confidence":"Medium","gaps":["RRM-C RNA targets not identified","Integration of catalytic and RNA-binding functions unclear"]},{"year":2019,"claim":"Established the metazoan binding mode to CCR4-NOT through a conserved CAF40-binding motif, structurally defining a mutually exclusive interface and linking it to functional mRNA decay.","evidence":"Crystal structures, binding assays, mutagenesis and tethered reporter decay","pmids":["30692204"],"confidence":"High","gaps":["Endogenous mRNA targets recruited via this motif unknown","Relationship to ligase activity not addressed"]},{"year":2021,"claim":"Connected CNOT4 to translation elongation, mRNA adaptor function, ubiquitin-proteasome degradation steps, and stress-induced cytoplasmic localization, broadening its physiological reach to meiosis and codon-dependent elongation.","evidence":"Ribosome profiling, conditional KO mouse, UFD substrate and ubiquitin-conjugate binding assays, and localization analysis","pmids":["34469733","34026442","33727038","34338747"],"confidence":"High","gaps":["Mechanism coupling elongation control to ligase activity incomplete","How cytoplasmic foci relate to function undefined"]},{"year":2023,"claim":"Linked Not4-driven ribosome pausing to co-translational mitochondrial mRNA docking and showed Not1 vs Not4 inversely control mRNA solubility tied to codon optimality, refining its role in spatial mRNA-protein homeostasis.","evidence":"Ribosome profiling of soluble/insoluble fractions, mitochondrial fractionation and genetic epistasis in yeast","pmids":["37094076","36803582"],"confidence":"Medium","gaps":["Direct substrate(s) driving pausing not fully defined","Generality beyond MMF1 unclear"]},{"year":2023,"claim":"Extended degradative substrates to disease-relevant human targets PAF1 and YAP in cancer cells, including a small-molecule (hydnocarpin) exploiting the CNOT4-YAP axis.","evidence":"Co-IP, ubiquitination assays, MST/DARTS binding in NSCLC and TNBC cells","pmids":["37493105","37802875"],"confidence":"Medium","gaps":["YAP degradation mechanistic detail limited (Low-confidence for the YAP/drug finding)","In vivo relevance of YAP axis not established"]},{"year":2024,"claim":"Identified ZNF598 as a CNOT4 substrate during ribosome quality control and showed CNOT4 itself undergoes regulatory K63 and TRIM21/TNKS1BP1-mediated K48/K6 ubiquitination, embedding it in feedback regulation.","evidence":"Linkage-specific in vivo ubiquitination, site-specific mutants, Drosophila genetics and Co-IP","pmids":["38388640","39019859"],"confidence":"Medium","gaps":["Cross-talk between CNOT4 auto-ubiquitination and substrate selection unknown","Stoichiometry and turnover kinetics undefined"]},{"year":2025,"claim":"Resolved the human CCR4-NOT relationship as non-constitutive and showed CNOT4 depletion accelerates mRNA decay opposite to CNOT1, while expanding regulatory roles to PPARγ-dependent adipogenesis, crinophagy, and TENT5C destabilization.","evidence":"Auxin-degron depletion with BioID and transcriptome decay, ChIP in Cnot4-Het mice, Drosophila imaging and proteomic stability assays (two preprints)","pmids":["41161383","40424271","41857610","bio_10.1101_2025.09.24.678350","bio_10.1101_2024.11.14.623596"],"confidence":"Medium","gaps":["Mechanism of the opposite mRNA-decay effect versus CNOT1 unexplained","TENT5C and crinophagy findings are preprints with limited CNOT4 mechanistic detail"]},{"year":null,"claim":"How CNOT4 selects among its many substrates and switches between K48, K63, and monoubiquitination outputs in different cellular contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model for substrate/linkage specificity","Relationship between ligase activity and CCR4-NOT-associated mRNA functions unclear","Human-cell substrate repertoire incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[3,7,8,13,14,15,26]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,8,12,13,14,15,26]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[16,19]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[19,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,32]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,21]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[7,10,18]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,8,12,14,24]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[17,19,23,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,16,32]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[15,29]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[8,9,10]}],"complexes":["CCR4-NOT complex"],"partners":["CNOT1","CAF40/CNOT9","UBCH5B","CNOT7","ECM29","TRIM21","TNKS1BP1","USP4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95628","full_name":"CCR4-NOT transcription complex subunit 4","aliases":["CCR4-associated factor 4","E3 ubiquitin-protein ligase CNOT4","Potential transcriptional repressor NOT4Hp","RING-type E3 ubiquitin transferase CNOT4"],"length_aa":575,"mass_kda":63.5,"function":"Has E3 ubiquitin ligase activity, promoting ubiquitination and degradation of target proteins (PubMed:11823428, PubMed:22159038, PubMed:26575292). Involved in activation of the JAK/STAT pathway (PubMed:11823428, PubMed:22159038). Catalyzes ubiquitination of methylated RBM15 (PubMed:26575292). Plays a role in quality control of translation of mitochondrial outer membrane-localized mRNA (PubMed:29861391). As part of the PINK1-regulated signaling, upon mitochondria damage, ubiquitinates ABCE1 and thereby recruits autophagy receptors to the mitochondrial outer membrane to initiate mitophagy (PubMed:29861391)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/O95628/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNOT4","classification":"Not Classified","n_dependent_lines":61,"n_total_lines":1208,"dependency_fraction":0.050496688741721855},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CNOT4","total_profiled":1310},"omim":[{"mim_id":"604917","title":"CCR4-NOT TRANSCRIPTION COMPLEX, SUBUNIT 1; CNOT1","url":"https://www.omim.org/entry/604917"},{"mim_id":"604911","title":"CCR4-NOT TRANSCRIPTION COMPLEX, SUBUNIT 4; CNOT4","url":"https://www.omim.org/entry/604911"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CNOT4"},"hgnc":{"alias_symbol":["CLONE243","NOT4H"],"prev_symbol":["NOT4"]},"alphafold":{"accession":"O95628","domains":[{"cath_id":"3.30.40.10","chopping":"11-79","consensus_level":"medium","plddt":80.1522,"start":11,"end":79},{"cath_id":"3.30.70.330","chopping":"102-246","consensus_level":"high","plddt":91.6944,"start":102,"end":246}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95628","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95628-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95628-F1-predicted_aligned_error_v6.png","plddt_mean":61.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNOT4","jax_strain_url":"https://www.jax.org/strain/search?query=CNOT4"},"sequence":{"accession":"O95628","fasta_url":"https://rest.uniprot.org/uniprotkb/O95628.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95628/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95628"}},"corpus_meta":[{"pmid":"7926748","id":"PMC_7926748","title":"NOT1(CDC39), 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/33592572","citation_count":4,"is_preprint":false},{"pmid":"33727038","id":"PMC_33727038","title":"Ccr4-Not complex subunits Ccr4, Caf1, and Not4 are novel proteolysis factors promoting the degradation of ubiquitin-dependent substrates by the 26S proteasome.","date":"2021","source":"Biochimica et biophysica acta. Molecular cell research","url":"https://pubmed.ncbi.nlm.nih.gov/33727038","citation_count":4,"is_preprint":false},{"pmid":"37802875","id":"PMC_37802875","title":"[Hydnocarpin inhibits malignant progression of triple negative breast cancer via CNOT4-mediated ubiquitination and degradation of YAP].","date":"2023","source":"Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica","url":"https://pubmed.ncbi.nlm.nih.gov/37802875","citation_count":4,"is_preprint":false},{"pmid":"40424271","id":"PMC_40424271","title":"Cnot4 heterozygosity attenuates high fat diet-induced obesity in mice and impairs PPARγ-mediated adipocyte differentiation.","date":"2025","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/40424271","citation_count":3,"is_preprint":false},{"pmid":"41161383","id":"PMC_41161383","title":"Auxin-induced depletion of human CCR4-NOT subunits reveals opposing functions of CNOT1 and CNOT4 in mRNA metabolism.","date":"2025","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/41161383","citation_count":2,"is_preprint":false},{"pmid":"38554309","id":"PMC_38554309","title":"Depletion of CNOT4 modulates the DNA damage responses following ionizing radiation (IR).","date":"2023","source":"Journal of cancer research and therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/38554309","citation_count":1,"is_preprint":false},{"pmid":"34338747","id":"PMC_34338747","title":"The C-terminal region of yeast ubiquitin-protein ligase Not4 mediates its cellular localization and stress response.","date":"2021","source":"FEMS microbiology letters","url":"https://pubmed.ncbi.nlm.nih.gov/34338747","citation_count":0,"is_preprint":false},{"pmid":"39798536","id":"PMC_39798536","title":"Ubiquitination-deficit of Cnot4 impairs the capacity of proliferation and differentiation in mouse embryonic stem cells.","date":"2024","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/39798536","citation_count":0,"is_preprint":false},{"pmid":"41857610","id":"PMC_41857610","title":"USP4 promotes non-small cell lung cancer tumorigenesis by antagonizing CNOT4-mediated degradation of PAF1.","date":"2026","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/41857610","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.09.24.678350","title":"Ubiquitination of secretory granules promotes crinophagic degradation in  <i>Drosophila</i>","date":"2025-09-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.24.678350","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.11.14.623596","title":"Efficient globin production during terminal erythropoiesis depends on the synergistic action of TENT5C poly(A) polymerase and LARP4/5","date":"2024-11-14","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.14.623596","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21186,"output_tokens":7902,"usd":0.091044,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17481,"output_tokens":5641,"usd":0.114215,"stage2_stop_reason":"end_turn"},"total_usd":0.205259,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"NOT4 physically interacts with NOT1 and NOT3 in the yeast two-hybrid assay, and NOT1/NOT2/NOT3/NOT4 form a ~500 kDa nuclear complex that acts as a global negative regulator of RNA Pol II transcription, preferentially repressing TC-element-dependent transcription.\",\n      \"method\": \"Two-hybrid interaction, biochemical co-fractionation, allele-specific suppression genetics\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two-hybrid plus co-fractionation plus genetic suppression, single lab but three orthogonal approaches\",\n      \"pmids\": [\"7926748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In the yeast CCR4-NOT complex, NOT4 (and NOT3) interact with the C-terminal region (residues 1490–2108) of NOT1, placing NOT4 peripheral to the CCR4-CAF1-NOT1-(NOT2,NOT5) core; NOT4 and NOT3 do not significantly affect the association of CCR4, CAF1, and NOT1 with each other.\",\n      \"method\": \"Co-immunoprecipitation, two-hybrid, deletion mapping, genetic analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with deletion mapping and genetic validation, single lab\",\n      \"pmids\": [\"10490603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human NOT4 contains a C4C4-type RING finger (residues 1–78) that coordinates two zinc ions in a cross-brace manner via cysteine residues; the NMR solution structure shows an alpha-helix and three long loops, overall similar to C3HC4 RING fingers but with distinct secondary structural elements in non-conserved regions.\",\n      \"method\": \"Heteronuclear NMR structure determination with 113Cd-substitution to confirm cross-brace zinc coordination\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution NMR structure with metal-substitution validation, well-defined atomic coordinates\",\n      \"pmids\": [\"11087754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The N-terminal RING finger domain of CNOT4 acts as an E3 ubiquitin ligase that specifically interacts with the ubiquitin-conjugating enzyme UbcH5B; NMR chemical shift perturbation mapping identified UbcH5B residues contacting the CNOT4 RING domain, and HADDOCK docking revealed the structural basis of E2/E3 specificity differing from the c-Cbl/UbcH7 interface.\",\n      \"method\": \"NMR chemical shift perturbation, HADDOCK computational docking, biochemical mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR mapping combined with structural modeling and mutagenesis in a single rigorous study\",\n      \"pmids\": [\"15062086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The two zinc-binding sites within the C4C4 RING domain of CNOT4 show differential metal exchange rates; NMR backbone dynamics analysis shows this differential stability arises from differences in site accessibility and electrostatic interactions, and CNOT4 RING is less flexible than the p44 RING domain.\",\n      \"method\": \"NMR backbone dynamics (Zn2+/Cd2+ exchange), relaxation measurements\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR with metal exchange assays, single lab, structural characterization without functional mutagenesis\",\n      \"pmids\": [\"15890366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Not4, together with Ubc4, is required for ubiquitin-mediated destabilization of Cdc17 (the catalytic subunit of DNA polymerase-α) in yeast; disruption of this turnover pathway causes hydroxyurea sensitivity and synthetic dosage lethality upon Cdc17 overexpression.\",\n      \"method\": \"Genetic deletion analysis, protein stability assays, growth phenotype assays (HU sensitivity, SDL)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple phenotypic readouts and epistasis between Ubc4, Not4, and Mcm10, single lab\",\n      \"pmids\": [\"20660159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Not4 E3 ligase is required for proper proteasome assembly: in not4Δ cells the regulatory particle (RP) and core particle (CP) form aberrant salt-resistant complexes, and Ecm29 (a proteasome chaperone) becomes ubiquitinated and degraded. Not4 associates with RP species in purified proteasome holoenzyme and interacts with Ecm29 to maintain normal proteasome integrity.\",\n      \"method\": \"Co-immunoprecipitation, proteasome purification/fractionation, in vivo ubiquitination assay, deletion genetics\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — purified proteasome biochemistry, Co-IP, in vivo ubiquitination, multiple orthogonal methods; replicated in the broader literature\",\n      \"pmids\": [\"21321079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Not4 ubiquitin ligase ubiquitinates Rps7A (but not its paralogue Rps7B) in vivo and in vitro; ubiquitinated Rps7A is found only in 80S and polysome fractions. Not4 is itself detectable in polysome fractions, and optimal presence of Not5 in polysomes depends on Not4.\",\n      \"method\": \"In vitro ubiquitination assay, polysome fractionation/sedimentation, deletion genetics, protein aggregation analysis\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination reconstitution plus polysome fractionation and genetic epistasis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22243599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Not4p ubiquitin ligase mediates H2O2-induced destruction of cyclin C via K48-linked polyubiquitination, directing it to the 26S proteasome. Cyclin C must translocate from nucleus to cytoplasm (requiring the cell-wall-integrity MAPK module and phospholipase C) before Not4p-dependent degradation; a cytoplasm-restricted cyclin C derivative is still subject to Not4p-dependent destruction.\",\n      \"method\": \"In vitro polyubiquitination assay with K48 linkage-specific analysis, genetic deletion, subcellular localization by microscopy, epistasis with MAPK/PLC pathway mutants\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination with K48 specificity, localization experiments, pathway epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"22421358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The nuclear E3 ubiquitin ligase Not4 binds to Yap1 in an oxidant-stimulated manner and is required for proteasome-dependent Yap1 degradation after oxidative stress; Yap1 degradation requires nuclear localization and DNA-binding ability of Yap1 but not chromatin binding.\",\n      \"method\": \"Co-immunoprecipitation, genetic screen of ubiquitin pathway mutants, proteasome inhibitor treatment, localization-restricted Yap1 mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus genetic and mutant analysis, single lab\",\n      \"pmids\": [\"22707721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Not4 associates with polysomes and contributes to translational repression of transcripts that cause transient ribosome stalling; absence of Not4 impairs global translational repression upon nutrient withdrawal, enhances expression of arrested nascent polypeptides, and causes constitutive protein folding stress and aggregation.\",\n      \"method\": \"Polysome fractionation, protein aggregation assays, pulse-chase translation analysis, genetic epistasis with decapping machinery mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome fractionation plus multiple functional assays, single lab\",\n      \"pmids\": [\"25971775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Not4 promotes protein quality control independently of the Ccr4 deadenylase module; clearance of aberrant proteins by Not4 operates at least in part via the proteasome.\",\n      \"method\": \"Genetic deletion of NOT4 vs CCR4, protein aggregation assays, proteasome activity measurements, epistasis analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple readouts, single lab\",\n      \"pmids\": [\"24465968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Human CNOT4 controls PAF1 protein levels by promoting K48-linked polyubiquitination of PAF1 and its subsequent degradation by the 26S proteasome; this degradation requires nuclear localization of PAF1 but not chromatin binding.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, NLS-deficient PAF1 mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus mutant localization analysis, single lab\",\n      \"pmids\": [\"25933433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CNOT4 acts as an E3 ubiquitin ligase for influenza A virus nucleoprotein (NP): CNOT4 interacts with NP in cells and ubiquitinates NP in vitro without affecting NP protein stability; monoubiquitination at residues K184, K227, and K273 in the RNA-binding groove of NP promotes viral RNA replication.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, CNOT4 knockdown/overexpression, mass spectrometry ubiquitination site mapping, arginine substitution mutagenesis\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution, mutagenesis of specific ubiquitination sites, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"28536288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Not4 selectively ubiquitinates Rpt5 during proteasomal ATPase (Rpt ring) assembly; Not4 competes with chaperones Nas2 and Hsm3 for access to Rpt5 ubiquitination sites, which are sterically occluded by these chaperones. Rpt5 ubiquitination does not destabilize the ring but blocks incorporation of Rpn1 ubiquitin receptor and Ubp6 deubiquitinase, thereby acting as an assembly checkpoint.\",\n      \"method\": \"In vitro ubiquitination reconstitution, structural modeling using known Rpt-chaperone co-crystal structures, proteasome assembly intermediate analysis, deletion/competition biochemistry\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of ubiquitination plus structural analysis plus biochemical assembly intermediates, multiple orthogonal methods\",\n      \"pmids\": [\"30530678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Upon mitochondrial damage, CNOT4 is recruited to the stalled ribosome/mRNA complex on the mitochondrial outer membrane and ubiquitinates ABCE1; this K63-linked poly-ubiquitin signal on ABCE1 recruits autophagy receptors to the mitochondrial outer membrane to initiate mitophagy downstream of PINK1 signaling.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, genetic epistasis in Drosophila PINK1 model, ribosome fractionation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus in vivo ubiquitination plus Drosophila genetic epistasis, replicated across cell and animal models\",\n      \"pmids\": [\"29861391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The Not4 RING domain is required for Ccr4-Not association with RNA Pol II, while the conserved RRM-C domain (RNA recognition motif and C3H1 domain) affects a specific subset of Pol II-regulated genes without affecting Ccr4-Not/Pol II association; individual RING or RRM-C mutations fail to replicate proteasomal defects seen in not4Δ cells, but combined RING/RRM-C mutations do.\",\n      \"method\": \"Domain mutagenesis, transcriptome analysis (RNA-seq), ChIP (Pol II occupancy), proteasome integrity assay, Co-IP\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis with multiple functional readouts, single lab\",\n      \"pmids\": [\"29802328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Metazoan NOT4 contains a conserved CAF40-binding motif (CBM) in its C-terminal region that directly binds the CAF40 subunit of the CCR4-NOT complex; crystal structures of the CBM-CAF40 complex show this binding surface is mutually exclusive with Roquin or Bag of marbles binding. CAF40 depletion or structure-guided mutagenesis of the NOT4-CAF40 interface impairs NOT4-dependent decay of tethered reporter mRNAs.\",\n      \"method\": \"Crystal structure determination, NMR/binding assays, mutagenesis, tethered mRNA reporter decay assay, CAF40 depletion\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional mRNA decay assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"30692204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Not4 and Not5 modulate translation elongation dynamics and change ribosome A-site dwelling occupancy in a codon-dependent fashion; Not4 E3 ligase activity (Rps7A ubiquitination) and a moonlighting function of Rli1 enable Not4-dependent translation of polyarginine stretches. Not5 resides in punctate loci (condensates) that co-purify with ribosomes and Rli1 but exclude eIF5A.\",\n      \"method\": \"Ribosome profiling, polysome fractionation, in vivo ubiquitination, microscopy, genetic deletion and epistasis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling plus biochemical fractionation plus in vivo ubiquitination plus localization, multiple orthogonal methods\",\n      \"pmids\": [\"34469733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In male germ cells, CNOT4 functions as an mRNA adaptor of the CCR4-NOT complex by targeting mRNAs to CNOT7 for deadenylation/degradation; conditional Cnot4 knockout in mouse male germ cells causes defective DNA double-strand break repair, impaired XY chromosome crossover, and infertility.\",\n      \"method\": \"Conditional knockout mouse model, RNA-seq, poly(A) tail analysis, immunofluorescence for meiotic markers\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple molecular and cellular phenotypic readouts plus mechanistic mRNA adaptor function, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34026442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ccr4, Caf1, and Not4 function at a post-ubiquitylation step in the ubiquitin-proteasome system to promote degradation of ubiquitinated substrates; Not4, Ccr4, and Caf1 bind cellular ubiquitin conjugates, and loss of any of these three genes impairs UPS-mediated degradation of a UFD pathway substrate in yeast.\",\n      \"method\": \"UFD pathway substrate degradation assays, ubiquitin conjugate binding assays, genetic deletion, proteasome interaction assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical binding assays plus functional degradation assays, single lab\",\n      \"pmids\": [\"33727038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Yeast Not4 localizes to cytoplasmic foci after cellular stress; the C-terminal 211 amino acids are required for proper localization to stress-induced cytoplasmic foci and for Not4 function in stress response gene regulation, while the last 120 amino acids are dispensable.\",\n      \"method\": \"Fluorescence microscopy (subcellular localization), domain deletion analysis, stress response gene expression assays\",\n      \"journal\": \"FEMS microbiology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization imaging with domain deletion functional analysis, single lab\",\n      \"pmids\": [\"34338747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Not4 promotes ribosome pausing during MMF1 mRNA translation, enabling co-translational docking of MMF1 mRNA to mitochondria via the MMF1 nascent chain mitochondrial targeting sequence, Egd1 chaperone, Om14, and the co-translational import machinery; Not4 also ubiquitinates the Egd1 chaperone, and this pathway (Mito-ENCay) additionally requires Caf130, Cis1, autophagy, and no-go-decay to limit MMF1 overexpression.\",\n      \"method\": \"Ribosome profiling, polysome fractionation, in vivo ubiquitination assay, mitochondrial fractionation, genetic epistasis with autophagy/no-go-decay mutants\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical and genetic approaches in a single lab, ribosome profiling plus fractionation plus ubiquitination\",\n      \"pmids\": [\"37094076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Depletion of Not1 and Not4 inversely affects mRNA solubility: depletion of Not4 solubilizes mRNAs with lower non-optimal codon content and higher expression, while depletion of Not1 solubilizes mitochondrial mRNAs; insoluble mRNAs are enriched for ribosomes dwelling at non-optimal codons and show higher proportion of co-translational degradation.\",\n      \"method\": \"Ribosome profiling of soluble vs insoluble mRNA fractions, transcriptome-wide mRNA decay analysis, genetic depletion\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ribosome profiling with fractionation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"36803582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CNOT4 facilitates ubiquitination and proteasomal degradation of PAF1 in non-small cell lung cancer cells, as confirmed by co-immunoprecipitation of CNOT4 with PAF1 and in vivo ubiquitination assays.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, CNOT4 overexpression in NSCLC cells\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay in cell lines, mechanistically similar to prior yeast/human data\",\n      \"pmids\": [\"37493105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CNOT4 directly binds YAP and promotes its ubiquitination and proteasomal degradation; the drug hydnocarpin binds both YAP and CNOT4 (confirmed by microscale thermophoresis and DARTS assay) and exploits this pathway to degrade YAP in triple negative breast cancer cells.\",\n      \"method\": \"Microscale thermophoresis, DARTS assay, ubiquitination assay, proteasome inhibitor rescue, co-immunoprecipitation\",\n      \"journal\": \"China journal of Chinese materia medica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, binding confirmed by biophysical assay but ubiquitination mechanistic detail is limited\",\n      \"pmids\": [\"37802875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CNOT4 undergoes regulatory K63-linked ubiquitination in a CNOT4-dependent manner (auto-ubiquitination context) and ubiquitinates ZNF598; this ubiquitination is required for ZNF598-mediated resolution of stalled ribosomes and protection against mitochondrial stress.\",\n      \"method\": \"In vivo ubiquitination assay with K63-linkage specificity, CNOT4 overexpression/depletion, Drosophila genetic models, ribosome stalling assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ubiquitination with linkage specificity plus Drosophila genetic epistasis, single lab\",\n      \"pmids\": [\"38388640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TNKS1BP1 interacts with TRIM21 and mediates ubiquitination of CNOT4 at K239 via K48 and K6 linkage, leading to CNOT4 degradation; this promotes inhibition of JAK2/STAT3 pathway activity, thereby inducing lipid accumulation and inhibiting autophagy in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay with site-specific mutant (K239), western blotting, genetic knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus site-specific ubiquitination mutagenesis, single lab\",\n      \"pmids\": [\"39019859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Human CNOT4 does not form a stable complex with CCR4-NOT by standard biochemical co-purification but associates with the complex in cells as shown by BioID proximity labeling; depletion of CNOT4 does not affect CCR4-NOT complex integrity but paradoxically accelerates global mRNA decay, opposite to the effect of CNOT1 depletion. mRNA stability changes in CCR4-NOT-depleted cells correlate with codon optimality.\",\n      \"method\": \"Auxin-induced degron depletion, BioID proximity labeling, transcriptome-wide mRNA abundance and decay measurement, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — acute depletion system plus transcriptome-wide analysis plus BioID, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"41161383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila salivary gland cells, Cnot4 ubiquitin ligase mediates ubiquitination of secretory granules (glue granules), marking them for crinophagic degradation (lysosomal fusion); loss of Cnot4 impairs glue granule fusion with lysosomes, while Cnot4 overexpression induces premature crinophagy.\",\n      \"method\": \"Genetic loss-of-function, overexpression, fluorescence microscopy of granule-lysosome fusion, in vivo ubiquitination\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic LOF and GOF with direct localization imaging, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.09.24.678350\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In mouse/human cells, CNOT4 ubiquitinates and destabilizes TENT5C poly(A) polymerase, providing a mechanism by which the CCR4-NOT deadenylase complex limits the stability of a cytoplasmic polyadenylation enzyme during erythropoiesis.\",\n      \"method\": \"Proteomic interaction assay, ubiquitination/protein stability analysis, genetic depletion\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — reported as a finding within a preprint focused on TENT5C; mechanistic detail for CNOT4 is limited to a single observation\",\n      \"pmids\": [\"bio_10.1101_2024.11.14.623596\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP4 deubiquitinase directly binds PAF1, removes K48-linked polyubiquitin chains added by CNOT4, and thereby stabilizes PAF1 protein levels; this antagonism between USP4 and CNOT4 controls PAF1 abundance and NSCLC tumor growth in vivo.\",\n      \"method\": \"Co-immunoprecipitation, K48-linkage-specific ubiquitination assay, proteasome inhibition, xenograft mouse model\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus linkage-specific ubiquitination plus in vivo xenograft rescue, single lab\",\n      \"pmids\": [\"41857610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Heterozygous deletion of Cnot4 in mice impairs PPARγ transcriptional activity: Cnot4 Het fibroblasts show decreased PPARγ binding to target gene promoters in response to rosiglitazone, reducing adipogenic gene expression and adipocyte differentiation capacity.\",\n      \"method\": \"Cnot4 heterozygous knockout mouse, ChIP for PPARγ promoter binding, gene expression analysis, in vitro adipocyte differentiation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional differentiation assay in genetic mouse model, single lab\",\n      \"pmids\": [\"40424271\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNOT4 is a RING-domain E3 ubiquitin ligase (using UbcH5B as its cognate E2) that functions both as a peripheral/non-constitutive subunit of the CCR4-NOT complex—associating via a conserved CAF40-binding motif in metazoans—and as an autonomous ubiquitin ligase; it ubiquitinates diverse substrates including Rps7A (monoubiquitination promoting ribosome function), Rpt5 (proteasome assembly checkpoint), cyclin C (K48-linked, stress-induced degradation), Yap1, PAF1 (polyubiquitination and proteasomal degradation), ABCE1 (K63-linked, mitophagy signaling), ZNF598 (ribosome quality control), and viral nucleoprotein NP; it associates with translating ribosomes to regulate co-translational quality control and translation elongation dynamics at non-optimal codons, promotes proteasome assembly via Ecm29, modulates mRNA solubility/decay in a direction opposite to CNOT1, and is itself regulated by TRIM21/TNKS1BP1-mediated ubiquitination and degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CNOT4 (yeast Not4) is a RING-finger E3 ubiquitin ligase that bridges ubiquitin-dependent protein quality control, translation, and the CCR4-NOT mRNA-degradation machinery [#0, #3]. Its N-terminal RING domain coordinates two zinc ions in a cross-brace arrangement and selects UbcH5B as its cognate ubiquitin-conjugating enzyme, an E2/E3 interface structurally distinct from the c-Cbl/UbcH7 paradigm [#2, #3]. CNOT4 was first defined as a peripheral subunit of the CCR4-NOT complex, associating via the C-terminal region of NOT1 in yeast and, in metazoans, through a conserved CAF40-binding motif whose interface is shared with Roquin and Bag-of-marbles [#1, #17]; in human cells it does not stably co-purify with the complex but associates in proximity-labeling and, when depleted, accelerates global mRNA decay opposite to CNOT1, while in mouse germ cells it acts as an mRNA adaptor delivering transcripts to CNOT7 for deadenylation [#19, #28]. As an autonomous ligase CNOT4 ubiquitinates a wide substrate range with linkage- and outcome-specific consequences: K48-linked polyubiquitination and proteasomal degradation of stress-induced cyclin C, PAF1, and YAP [#8, #12, #25]; monoubiquitination of the ribosomal protein Rps7A and of influenza nucleoprotein NP [#7, #13]; and K63-linked ubiquitination of ABCE1 to signal mitophagy and of ZNF598 during ribosome quality control [#15, #26]. CNOT4 associates with translating ribosomes, where it shapes elongation dynamics and A-site dwelling at non-optimal codons and couples ribosome pausing to co-translational protein quality control and degradation [#10, #18, #23]. It also governs proteasome homeostasis, maintaining proteasome integrity through Ecm29 and acting as an assembly checkpoint by ubiquitinating Rpt5 in competition with assembly chaperones [#6, #14]. CNOT4 abundance is itself controlled by TRIM21/TNKS1BP1-mediated K48/K6 ubiquitination, and its degradation of PAF1 is antagonized by the deubiquitinase USP4 [#27, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established NOT4 as a physical and functional member of a nuclear NOT complex repressing RNA Pol II transcription, anchoring it to a multiprotein regulatory machine before any enzymatic role was known.\",\n      \"evidence\": \"Two-hybrid, co-fractionation and suppressor genetics in yeast\",\n      \"pmids\": [\"7926748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical activity assigned to NOT4 itself\", \"Architecture within the complex undefined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Mapped NOT4 to a peripheral position on the CCR4-CAF1-NOT1 core, showing it is dispensable for core integrity and distinguishing it from constitutive subunits.\",\n      \"evidence\": \"Co-IP, two-hybrid and deletion mapping in the yeast CCR4-NOT complex\",\n      \"pmids\": [\"10490603\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of peripheral association unclear\", \"Does not address metazoan binding mode\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Solved the C4C4 RING-finger structure and cross-brace zinc coordination, providing the structural basis for a catalytic identity.\",\n      \"evidence\": \"Heteronuclear NMR with 113Cd substitution\",\n      \"pmids\": [\"11087754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No E2 partner identified\", \"No substrate or ligase activity demonstrated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined UbcH5B as the cognate E2 and established the molecular basis of E2/E3 specificity, confirming CNOT4 as a bona fide E3 ligase.\",\n      \"evidence\": \"NMR chemical-shift mapping, HADDOCK docking and mutagenesis\",\n      \"pmids\": [\"15062086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates not yet known\", \"Linkage type not determined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked Not4 ligase activity with Ubc4 to in vivo turnover of a DNA polymerase subunit, the first cellular substrate context.\",\n      \"evidence\": \"Yeast deletion genetics, stability assays and HU-sensitivity phenotypes\",\n      \"pmids\": [\"20660159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of Cdc17 not reconstituted\", \"Linkage type unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a role in proteasome homeostasis, with Not4 maintaining proteasome integrity through Ecm29.\",\n      \"evidence\": \"Proteasome purification, Co-IP, in vivo ubiquitination and deletion genetics in yeast\",\n      \"pmids\": [\"21321079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Not4 prevents aberrant RP-CP complexes incomplete\", \"Direct Ecm29 ubiquitination not fully defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified ribosome-associated and stress-responsive substrates (Rps7A monoubiquitination; K48 degradation of cyclin C; Yap1 turnover), establishing CNOT4 as a multi-substrate ligase coupled to translation and oxidative stress.\",\n      \"evidence\": \"In vitro and in vivo ubiquitination, polysome fractionation, localization and pathway epistasis in yeast\",\n      \"pmids\": [\"22243599\", \"22421358\", \"22707721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional outcome of Rps7A monoubiquitination on the ribosome not resolved\", \"How substrate selection is achieved unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected Not4 to co-translational quality control, showing it represses translation of stall-prone transcripts and clears aberrant proteins independently of the Ccr4 deadenylase module.\",\n      \"evidence\": \"Polysome fractionation, aggregation assays, pulse-chase and genetic epistasis in yeast\",\n      \"pmids\": [\"25971775\", \"24465968\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ribosome-bound substrates of repression unidentified\", \"Mechanistic coupling of ligase activity to translational repression unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended substrate range to human PAF1, demonstrating K48-linked polyubiquitination and proteasomal degradation requiring nuclear but not chromatin localization.\",\n      \"evidence\": \"Co-IP, ubiquitination assay and NLS-mutant analysis in human cells\",\n      \"pmids\": [\"25933433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream signal controlling PAF1 degradation unknown\", \"Physiological context not yet defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed CNOT4 ubiquitinates a viral substrate, monoubiquitinating influenza NP in its RNA-binding groove to promote viral replication without altering NP stability.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination, MS site mapping and arginine-substitution mutagenesis\",\n      \"pmids\": [\"28536288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Host benefit/cost of this activity unresolved\", \"Whether host substrates share this monoubiquitination mode unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined linkage-specific signaling roles: K63 ubiquitination of ABCE1 to trigger mitophagy and Rpt5 ubiquitination as a proteasome assembly checkpoint that blocks Rpn1/Ubp6 incorporation.\",\n      \"evidence\": \"In vitro reconstitution, structural modeling, Drosophila PINK1 epistasis and ribosome fractionation\",\n      \"pmids\": [\"29861391\", \"30530678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch between K48 and K63 output not mechanistically explained\", \"Recruitment to damaged mitochondria incompletely defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Dissected domain contributions, showing the RING domain mediates Ccr4-Not/Pol II association while the RRM-C domain controls a distinct gene subset, with proteasomal defects requiring both.\",\n      \"evidence\": \"Domain mutagenesis, RNA-seq, Pol II ChIP and proteasome assays in yeast\",\n      \"pmids\": [\"29802328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RRM-C RNA targets not identified\", \"Integration of catalytic and RNA-binding functions unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established the metazoan binding mode to CCR4-NOT through a conserved CAF40-binding motif, structurally defining a mutually exclusive interface and linking it to functional mRNA decay.\",\n      \"evidence\": \"Crystal structures, binding assays, mutagenesis and tethered reporter decay\",\n      \"pmids\": [\"30692204\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous mRNA targets recruited via this motif unknown\", \"Relationship to ligase activity not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected CNOT4 to translation elongation, mRNA adaptor function, ubiquitin-proteasome degradation steps, and stress-induced cytoplasmic localization, broadening its physiological reach to meiosis and codon-dependent elongation.\",\n      \"evidence\": \"Ribosome profiling, conditional KO mouse, UFD substrate and ubiquitin-conjugate binding assays, and localization analysis\",\n      \"pmids\": [\"34469733\", \"34026442\", \"33727038\", \"34338747\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling elongation control to ligase activity incomplete\", \"How cytoplasmic foci relate to function undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked Not4-driven ribosome pausing to co-translational mitochondrial mRNA docking and showed Not1 vs Not4 inversely control mRNA solubility tied to codon optimality, refining its role in spatial mRNA-protein homeostasis.\",\n      \"evidence\": \"Ribosome profiling of soluble/insoluble fractions, mitochondrial fractionation and genetic epistasis in yeast\",\n      \"pmids\": [\"37094076\", \"36803582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate(s) driving pausing not fully defined\", \"Generality beyond MMF1 unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended degradative substrates to disease-relevant human targets PAF1 and YAP in cancer cells, including a small-molecule (hydnocarpin) exploiting the CNOT4-YAP axis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, MST/DARTS binding in NSCLC and TNBC cells\",\n      \"pmids\": [\"37493105\", \"37802875\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"YAP degradation mechanistic detail limited (Low-confidence for the YAP/drug finding)\", \"In vivo relevance of YAP axis not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified ZNF598 as a CNOT4 substrate during ribosome quality control and showed CNOT4 itself undergoes regulatory K63 and TRIM21/TNKS1BP1-mediated K48/K6 ubiquitination, embedding it in feedback regulation.\",\n      \"evidence\": \"Linkage-specific in vivo ubiquitination, site-specific mutants, Drosophila genetics and Co-IP\",\n      \"pmids\": [\"38388640\", \"39019859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-talk between CNOT4 auto-ubiquitination and substrate selection unknown\", \"Stoichiometry and turnover kinetics undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved the human CCR4-NOT relationship as non-constitutive and showed CNOT4 depletion accelerates mRNA decay opposite to CNOT1, while expanding regulatory roles to PPARγ-dependent adipogenesis, crinophagy, and TENT5C destabilization.\",\n      \"evidence\": \"Auxin-degron depletion with BioID and transcriptome decay, ChIP in Cnot4-Het mice, Drosophila imaging and proteomic stability assays (two preprints)\",\n      \"pmids\": [\"41161383\", \"40424271\", \"41857610\", \"bio_10.1101_2025.09.24.678350\", \"bio_10.1101_2024.11.14.623596\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of the opposite mRNA-decay effect versus CNOT1 unexplained\", \"TENT5C and crinophagy findings are preprints with limited CNOT4 mechanistic detail\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CNOT4 selects among its many substrates and switches between K48, K63, and monoubiquitination outputs in different cellular contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model for substrate/linkage specificity\", \"Relationship between ligase activity and CCR4-NOT-associated mRNA functions unclear\", \"Human-cell substrate repertoire incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [3, 7, 8, 13, 14, 15, 26]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 8, 12, 13, 14, 15, 26]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [16, 19]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [19, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 32]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 21]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [7, 10, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 8, 12, 14, 24]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [17, 19, 23, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 16, 32]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [15, 29]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [8, 9, 10]}\n    ],\n    \"complexes\": [\"CCR4-NOT complex\"],\n    \"partners\": [\"CNOT1\", \"CAF40/CNOT9\", \"UbcH5B\", \"CNOT7\", \"Ecm29\", \"TRIM21\", \"TNKS1BP1\", \"USP4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}