{"gene":"CPEB3","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2006,"finding":"CPEB3 and CPEB4 bind different RNA sequences than CPEB1, as determined by SELEX, RNA structure probing, and footprinting, placing them in a distinct class of RNA-binding proteins. In transfected neurons, CPEB3 represses translation of a reporter RNA in tethered function assays; NMDA receptor activation stimulates translation. CPEB3-mediated translation does not require the AAUAAA cis-element or cleavage and polyadenylation specificity factor (CPSF), unlike CPEB1-induced polyadenylation. CPEB3 binds GluR2 (GluA2) mRNA in vitro and in vivo, and RNAi knockdown of CPEB3 in neurons elevates GluR2 protein levels, establishing CPEB3 as a translational repressor of GluR2.","method":"SELEX, RNA structure probing, RNA footprinting, tethered function assays in transfected neurons, in vitro and in vivo RNA binding, RNAi knockdown","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (SELEX, footprinting, in vitro binding, in vivo RIP, functional reporter assay, RNAi knockdown) in a single rigorous study","pmids":["17024188"],"is_preprint":false},{"year":2011,"finding":"CPEB3 is activated by Neuralized1, an E3 ubiquitin ligase. Neuralized1-mediated non-proteolytic ubiquitination of CPEB3 in hippocampal cultures leads to growth of new dendritic spines and increased GluA1 and GluA2 (AMPA receptor subunits), which are CPEB3 target mRNAs. Conditional overexpression of Neuralized1 increases GluA1, GluA2, spine number, and functional synapses; inhibition of Neuralized1 reduces these and impairs hippocampal-dependent memory and synaptic plasticity.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, hippocampal neuron culture, conditional transgenic mouse overexpression/inhibition, behavioral and electrophysiological assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro ubiquitination, genetic gain- and loss-of-function with defined cellular and behavioral phenotypes, published in Cell","pmids":["22153079"],"is_preprint":false},{"year":2011,"finding":"CPEB3 recruits the Caf1 deadenylase to target mRNAs via direct binding to Tob (anti-proliferative protein), forming a ternary CPEB3–Tob–Caf1 complex. The C-terminal RNA-binding domain of CPEB3 binds the C-terminal unstructured region of Tob; Tob then recruits Caf1. CPEB3-accelerated deadenylation and mRNA decay is abrogated by dominant-negative mutants of either Caf1 or Tob.","method":"Direct binding assays, co-immunoprecipitation, dominant-negative mutant analysis, deadenylation assay, tethering assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted ternary complex, domain mapping, dominant-negative mutants, multiple orthogonal methods in one study","pmids":["21336257"],"is_preprint":false},{"year":2012,"finding":"NMDA receptor activation causes calpain 2-mediated proteolysis of the N-terminal repression motif of CPEB3, but not its C-terminal RNA-binding domain. The cleaved CPEB3 fragment retains RNA binding but fails to repress translation, thereby de-repressing CPEB3 target mRNAs (including EGFR) at the translational level. Calcium influx through NMDARs activates calpain 2, which proteolyzes CPEB3.","method":"Pharmacological inhibition, RNAi knockdown of calpain 2, domain-specific cleavage analysis, Western blot, translation assays in NMDA-stimulated neurons","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological and genetic (knockdown) approaches, domain-level mechanism, multiple orthogonal readouts in one study","pmids":["22711986"],"is_preprint":false},{"year":2012,"finding":"IPO5 (importin 5) facilitates nuclear import of CPEB3 by binding to the RRM1 domain of CPEB3. CRM1 facilitates nuclear export via a leucine-containing motif of CPEB3. NMDAR signaling increases RanBP1 expression and reduces cytoplasmic GTP-bound Ran, which enhances CPEB3–IPO5 interaction and accelerates nuclear import of CPEB3. In the nucleus, CPEB3 binds Stat5b and suppresses Stat5b-dependent transcription.","method":"Co-immunoprecipitation, domain mapping, RanBP1 overexpression, pharmacological NMDA stimulation, nuclear fractionation, reporter assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain-level mapping, multiple cellular manipulations (RanBP1 OE, NMDA stimulation), mechanistic pathway placed","pmids":["22730302"],"is_preprint":false},{"year":2010,"finding":"CPEB3 interacts with Stat5b in the nucleus and inhibits Stat5b transcriptional activity without disrupting Stat5b dimerization, DNA binding, or nuclear localization. NMDA receptor activation causes nuclear accumulation of CPEB3. EGFR is a target gene transcriptionally activated by Stat5b and negatively regulated by CPEB3 in neurons; CPEB3 knockdown increases EGFR expression and alters EGF-induced downstream signaling kinetics.","method":"Co-immunoprecipitation, reporter assay, RNAi knockdown, NMDA stimulation, nuclear fractionation, Western blot","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, reporter assay, RNAi knockdown with defined signaling phenotype, multiple orthogonal methods","pmids":["20639532"],"is_preprint":false},{"year":2015,"finding":"CPEB3 is SUMOylated in hippocampal neurons in vitro and in vivo under basal (unstimulated) conditions, in which state it is soluble and acts as a translational repressor. Following neuronal stimulation, CPEB3 is de-SUMOylated, forms aggregates/oligomers, and promotes translation of target mRNAs. A chimeric CPEB3 fused to SUMO cannot form aggregates and cannot activate translation of target mRNAs, establishing SUMOylation as an inhibitory constraint on CPEB3 aggregation and activity.","method":"SUMOylation assay in neurons (in vitro and in vivo), chimeric SUMO-fusion protein, aggregation assay, translational reporter assay, neuronal stimulation paradigm","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct biochemical modification assay, SUMO-fusion dominant-negative approach, translational assay, in vitro and in vivo corroboration","pmids":["26074071"],"is_preprint":false},{"year":2015,"finding":"CPEB3 forms heritable aggregates (a hallmark of prions) when expressed in yeast. Deletion analysis of the CPEB3 prion domain revealed a tripartite organization: two aggregation-promoting domains flanking a regulatory module that mediates interaction with the actin cytoskeleton. CPEB3 aggregation is necessary for its function in mouse neurons, confirming it as a functional prion.","method":"Yeast prion assay, deletion analysis, actin interaction assay, mouse neuronal studies","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast prion assay, domain deletion mapping, mouse neuronal functional validation, multiple orthogonal methods in one study","pmids":["26074072"],"is_preprint":false},{"year":2015,"finding":"CPEB3 aggregation and prion-like activity are required for maintenance of hippocampal long-term potentiation and hippocampus-dependent spatial memory. Genetic ablation of CPEB3 impairs maintenance of both. CPEB3 levels and aggregation increase after neuronal activity, supporting a model whereby CPEB3 aggregates function as active translational regulators for memory persistence.","method":"CPEB3 knockout mouse, LTP electrophysiology, Morris water maze spatial memory test, Western blot for aggregation state","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined electrophysiological and behavioral phenotypes, aggregation biochemistry, replicated across multiple assays","pmids":["26074003"],"is_preprint":false},{"year":2013,"finding":"CPEB3 knockout mice display enhanced hippocampus-dependent memory and facilitated LTD. Molecular analysis shows elevated translational levels of PSD95, NMDA receptors, and GluA1 in CPEB3 KO neurons, establishing CPEB3 as a translational repressor of multiple plasticity-related proteins at glutamatergic synapses.","method":"CPEB3 knockout mouse, contextual fear conditioning, Morris water maze, electrophysiology, Western blot, molecular characterization of PSD95, NMDARs, GluA1","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple behavioral and molecular readouts, replicated across assays, independently corroborates translational repressor role","pmids":["24155305"],"is_preprint":false},{"year":2019,"finding":"Basal, SUMOylated CPEB3 localizes to P bodies (membraneless cytoplasmic processing bodies enriched in translationally repressed mRNA). After neuronal stimulation, CPEB3 moves to polysomes to promote translation of target mRNAs. SUMOylation state controls this distribution. In vitro, SUMOylated CPEB3 recombinant protein undergoes phase separation when bound to a specific mRNA target.","method":"Subcellular fractionation, immunofluorescence co-localization with P body markers, polysome fractionation, in vitro phase separation assay with recombinant SUMOylated CPEB3","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization with functional consequence (P body vs polysome), in vitro phase separation, SUMOylation-dependent mechanism, multiple orthogonal methods","pmids":["31416913"],"is_preprint":false},{"year":2014,"finding":"CPEB3 deficiency leads to elevated activation of CaMKIIα, increased Ser831 phosphorylation of GluA1, and slow degradation of PSD95 and GluA1 under NMDA-induced chemical LTD. CPEB3 KO hippocampus shows impaired NMDAR-dependent synaptic depotentiation; pharmacological suppression of CaMKIIα during the depotentiation-initiating phase rescues LTP reversal in KO hippocampus.","method":"CPEB3 KO mouse, electrophysiology (depotentiation, c-LTD), Western blot for CaMKIIα activation and phospho-GluA1, pharmacological CaMKIIα inhibition","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with electrophysiological and biochemical readouts, pharmacological rescue, pathway placed through epistasis","pmids":["25404896"],"is_preprint":false},{"year":2020,"finding":"CPEB3 directly binds to the 3'UTR of IL-6R mRNA and reduces IL-6R protein levels, thereby decreasing phospho-STAT3 in colorectal cancer cells. CPEB3 knockdown increases IL-6R expression, activates STAT3, and promotes M2-like TAM polarization via increased CCL2 secretion. These findings place CPEB3 upstream of the IL-6R/STAT3 axis as a post-transcriptional repressor.","method":"RNA immunoprecipitation, luciferase reporter assay, RIP, CPEB3 overexpression/knockdown, co-culture, Western blot for p-STAT3","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and luciferase reporter confirm direct mRNA binding, Western blot for downstream pathway, but single lab study","pmids":["32653013"],"is_preprint":false},{"year":2020,"finding":"NFE2L3 induces CPEB3 gene expression, and CPEB3 then binds to the NFE2L1 3'UTR to repress NFE2L1 mRNA translation, reducing polysome formation on NFE2L1 mRNA. This NFE2L3-CPEB3-NFE2L1 translational repression axis maintains basal proteasome activity in cancer cells.","method":"RNAi double knockdown, polysome profiling, reporter assay, Western blot for proteasome subunits and NFE2L1","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome profiling and reporter assay establish translational repression, multiple KD experiments, single lab","pmids":["32366381"],"is_preprint":false},{"year":2020,"finding":"CPEB3 binds to the 3'UTR of MTDH mRNA and suppresses its translation in hepatocellular carcinoma cells in vivo and in vitro, inhibiting EMT and metastasis. RNA immunoprecipitation identified transcriptome-wide CPEB3-bound mRNAs; MTDH was confirmed as a direct target. Cpeb3 knockout mice showed increased susceptibility to carcinogen-induced hepatocarcinogenesis and lung metastasis.","method":"RNA immunoprecipitation (RIP-seq), luciferase reporter assay (3'UTR binding), Western blot for MTDH, cpeb3 KO mouse, in vivo carcinogenesis model","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP-seq for target identification, luciferase 3'UTR assay, KO mouse in vivo phenotype, multiple orthogonal methods","pmids":["32968053"],"is_preprint":false},{"year":2016,"finding":"CPEB3 suppresses GluA2 protein synthesis in a topologically graded manner in cerebellar stellate cells. Action potentials produce graded dendritic depolarizations that elevate CPEB3 protein at proximal dendrites; CPEB3 then binds GluA2 mRNA and suppresses GluA2 translation, leading to a distance-dependent increase in synaptic GluA2-containing AMPARs. Activity-induced CPEB3 expression requires increased Ca2+ and PKC activation.","method":"CPEB3 overexpression/knockdown in mouse cerebellar stellate cells, electrophysiology, live imaging, pharmacological Ca2+ and PKC manipulation, Western blot","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiology and imaging with pharmacological dissection, but predominantly single lab","pmids":["27681423"],"is_preprint":false},{"year":2020,"finding":"Stress suppresses GluA1 protein synthesis in cerebellar Bergmann glial cells via an adrenergic/adenylyl cyclase 5 (AC5)/CPEB3 pathway. CPEB3 binds GluA1 mRNA and regulates its translation; mice lacking CPEB3 do not show stress-induced GluA1 reduction, and deletion of AC5 prevents GluA1 suppression. This reduces AMPA receptor-mediated currents and causes retraction of glial lateral processes.","method":"CPEB3 knockout mouse, AC5 knockout mouse, β-adrenergic receptor blocker pharmacology, electrophysiology, immunofluorescence, Western blot","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO (CPEB3 and AC5), pharmacological block, electrophysiology and imaging, defined molecular pathway placed","pmids":["32229518"],"is_preprint":false},{"year":2021,"finding":"CPEB3 translationally suppresses Nr3c1 (glucocorticoid receptor) mRNA in hippocampal neurons; a genome-wide screen (RIP-seq) of CPEB3-bound transcripts identified Nr3c1 as a target. CPEB3-KO neurons show elevated GR expression, increased corticosterone-induced calcium influx, and decreased BDNF mRNA and protein, linking CPEB3 loss to impaired fear extinction.","method":"CPEB3 KO mouse, genome-wide RIP-seq, behavioral fear conditioning/extinction paradigm, Western blot, calcium imaging, intracerebroventricular BDNF delivery rescue","journal":"Neuropsychopharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide RIP-seq target identification, KO mouse with behavioral and biochemical phenotype, rescue experiment","pmids":["33941859"],"is_preprint":false},{"year":2016,"finding":"CPEB3 suppresses translation of TRPV1 mRNA in dorsal root ganglia neurons. CPEB3-KO mice show hypersensitivity to noxious heat; CPEB3/TRPV1 double-KO mice phenocopy TRPV1-KO mice with severely impaired thermosensation, establishing CPEB3 as a translational repressor of TRPV1 upstream of thermal nociception.","method":"CPEB3 KO mouse, TRPV1 KO mouse, CPEB3/TRPV1 double-KO mouse, conditional KO, behavioral thermal/mechanical nociception tests, Western blot for TRPV1","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via double-KO, conditional KO, behavioral phenotype, pathway placed","pmids":["26915043"],"is_preprint":false},{"year":2022,"finding":"CPEB3 interacts with the 3'UTR of ADAR1 mRNA through binding to CPEB nucleotide elements, inhibits ADAR1 translation by localizing ADAR1 mRNA to P bodies, and thereby suppresses ADAR1-mediated RNA editing in gastric cancer cells. Microscale thermophoresis revealed direct interaction between CPEB3 (residues 440–698) and GW182 (residues 403–860), a major P-body component, mediating P-body targeting.","method":"RNA immunoprecipitation, luciferase reporter assay (3'UTR), P body co-localization, microscale thermophoresis (direct protein-protein interaction), KO/KD functional assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding quantified by MST, RIP, luciferase 3'UTR assay, P-body localization mechanism, domain-level mapping","pmids":["36068334"],"is_preprint":false},{"year":2023,"finding":"CPEB3's low-complexity motif (LCM) mediates protein-protein interactions essential for localization to neuronal DCP1-bodies (RNP granules). After chemical LTP induction, both translation-promoting CPEB3 and translation-inhibiting CPEB1 are packaged into neuronal RNP granules, but only CPEB3 is repackaged at later time points. This localization is critical for CPEB3's functional influence on local protein synthesis (measured as AMPA receptor insertion into the membrane and synaptic localization).","method":"Fluorescence microscopy (live imaging and fixed), co-localization with DCP1-body markers, CPEB3 LCM deletion mutants, chemical LTP, AMPA receptor trafficking assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct live imaging of RNP granule dynamics, LCM domain deletion, functional AMPA trafficking readout, multiple orthogonal methods","pmids":["36716374"],"is_preprint":false},{"year":2022,"finding":"CPEB3 is increased in FMRP-knockout (Fmr1 KO) hippocampal neurons and acts as an upstream effector of elevated GluA2 mRNA transcription in dendrites. Increased CPEB3 drives elevated GluA2 subunit expression, switches synaptic AMPA receptors from GluA2-lacking (Ca2+-permeable) to GluA2-containing (Ca2+-impermeable) at CA1 inhibitory interneurons, and reduces inhibitory synaptic transmission.","method":"Single-molecule mRNA detection (smFISH), Fmr1 KO mouse, CPEB3 knockdown, electrophysiology, Western blot","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — single-molecule imaging, genetic KO and KD, electrophysiology, multiple orthogonal methods","pmids":["35675768"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure of amyloid fibrils formed in vitro from the first prion-like domain of human CPEB3 reveals a 49-residue ordered core (L103–F151). CPEB3 lacking this segment forms abnormal puncta in cells, localizes away from P bodies toward stress granules, and lacks the ability to influence protein synthesis in neurons. Cryo-FIB milling and cryo-ET of neuronal cells reveal CPEB3-GFP signal associated with multivesicular bodies and bundled filaments.","method":"Cryo-EM structure determination, cryo-focused ion beam milling, cryo-electron tomography in neuronal cells, deletion mutant functional assay, subcellular localization (immunofluorescence/GFP), translation reporter assay, cell viability assay","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure of amyloid core, cryo-ET in intact neurons, domain deletion with functional validation, multiple orthogonal methods in one study","pmids":["40480223"],"is_preprint":false},{"year":2021,"finding":"CPEB3 stabilizes a subset of maternal mRNAs with long 3'UTRs enriched in cytoplasmic polyadenylation elements; CPEB3-depleted oocytes undergo normal meiosis but show early embryonic arrest due to disrupted transcriptome and aberrant protein expression, leading to failure of embryonic transcription initiation.","method":"Cpeb3-mutant mouse oocytes, transcriptomic analysis, protein expression analysis, developmental phenotyping","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined developmental phenotype and transcriptomic evidence, but functional mechanism at molecular level based on correlative transcriptomics","pmids":["38786074"],"is_preprint":false},{"year":2016,"finding":"CPEB3 suppresses translation of Megf10 mRNA during the first postnatal week; in CPEB3-KO retinas, elevated MEGF10 expression (a homotypic repulsion mediator) disrupts the mosaic spatial organization of ON starburst amacrine cells. This identifies CPEB3 as a translational repressor of Megf10 RNA with a role in shaping retinal mosaic arrangement.","method":"CPEB3 KO mouse, Western blot, immunofluorescence, retinal mosaic analysis","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with molecular and cellular phenotype, single lab, Western blot confirms translational target","pmids":["27822178"],"is_preprint":false},{"year":2020,"finding":"CPEB3 functions as a translational repressor of JAK1 mRNA by binding to its 3'UTR, thereby inhibiting JAK/STAT signaling in colorectal cancer cells; CPEB3 knockdown activates JAK-STAT signaling and promotes proliferation and metastasis.","method":"RNA-binding protein immunoprecipitation, luciferase reporter assay (3'UTR), CPEB3 overexpression/knockdown, Western blot for JAK/STAT pathway components","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RIP and luciferase reporter confirm direct mRNA binding, functional KD assays, but single lab","pmids":["33146632"],"is_preprint":false},{"year":2016,"finding":"Loss of CPEB3 activity in high-grade gliomas is caused by expression of alternatively spliced variants lacking the B-region, which overlaps with the kinase recognition site, reducing phosphorylation of CPEB3 in tumor samples. Protein Kinase A and CaMKII robustly phosphorylate CPEB3 in vitro and in primary hippocampal neurons, specifically at isoforms containing exon 7 (B-region).","method":"In vitro kinase assay (PKA and CaMKII), phosphospecific antibody, splicing/isoform analysis, kainate-induced status epilepticus mouse model, Western blot","journal":"PloS one / Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay confirms PKA and CaMKII as writers, phosphospecific antibody validates in neurons, isoform-specific mechanism","pmids":["26915047","27256982"],"is_preprint":false},{"year":2022,"finding":"CPEB3 binds to the CPE signal in the p53 mRNA 3'UTR and stabilizes p53 mRNA expression in bladder cancer cells. CPEB3-mediated p53 mRNA stabilization is part of the circKDM1A/miR-889-3p/CPEB3/p53 axis that suppresses bladder cancer progression.","method":"Dual-luciferase reporter assay, RIP assay, CPEB3 overexpression/knockdown, Western blot","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase 3'UTR assay and RIP confirm direct RNA binding to p53 3'UTR, but single lab and limited mechanistic follow-up","pmids":["38632984"],"is_preprint":false},{"year":2023,"finding":"The first prion domain (PRD1) of CPEB3 interacts with the VQIVYKPVDLSKV segment of tau and inhibits tau-K18 aggregation; this interaction simultaneously enhances PRD1 fibril formation. The PRD1-Q region is specifically responsible for inhibiting tau-K18 aggregation.","method":"NMR relaxation spectroscopy, fibril formation assays, subdomain peptide mapping","journal":"The journal of physical chemistry. B","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR residue-specific interaction mapping and aggregation assays, but single lab and no in vivo validation","pmids":["39908090"],"is_preprint":false},{"year":2022,"finding":"NMR spectroscopic characterization of the 426-residue intrinsically disordered region (IDR) of human CPEB3 reveals that it lacks stable folded structure. Residues M1–P29 adopt a helical+disordered motif; residues 86–93 and 166–175 form polyproline II helices; residues 200–250 contain three partially populated α-helices; residues 345–355 (NLS) form a modestly populated α-helix potentially mediating STAT5B binding.","method":"Solution-state NMR spectroscopy (chemical shift, relaxation), secondary structure analysis","journal":"BMC biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR structural characterization with residue-level resolution, but limited functional validation of specific structural elements","pmids":["35658951"],"is_preprint":false},{"year":2021,"finding":"The first prion subdomain PRD1 of mouse CPEB3 autonomously forms amyloid fibrils in vitro and punctate-like structures in vivo. A 94-residue PRD1-core and a 23-residue peptide (E124–H145) display high aggregation propensity; solid-state NMR reveals a β-rich core of ~40 amino acids at the N-terminus of PRD1-core.","method":"In vitro fibril formation assay, electron microscopy, X-ray diffraction, solution-state and solid-state NMR, deuterium exchange, in vivo puncta formation","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple structural methods (EM, XRD, solid-state NMR) plus in vivo validation, defines amyloid core at residue level","pmids":["34081983"],"is_preprint":false},{"year":2023,"finding":"CPEB3 prion-like aggregation is inhibited in vitro by the anti-amyloidogenic polyglutamine binding peptide 1 (QBP1-M8) without affecting CPEB3 phase separation. Transgenic mice constitutively expressing QBP1 show impaired consolidation of hippocampal-dependent memories (at 24h) and reduced CPEB3 oligomerization in hippocampal extracts, but no effect on short-term memory.","method":"In vitro aggregation inhibition assay, transgenic mouse behavioral phenotyping, biochemical analysis of CPEB3 oligomerization state","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro amyloid inhibition + transgenic mouse with behavioral and biochemical readouts, but preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.01.27.635080"],"is_preprint":true},{"year":2026,"finding":"TRAIP E3 ubiquitin ligase (transcriptionally activated by SOX9) mediates poly-ubiquitylation and proteasomal degradation of CPEB3 in gastric cancer cells. This relieves CPEB3-mediated translational repression of oncogenic targets, leading to hyperactivation of mTORC1 signaling. Epistatic rescue experiments show TRAIP's oncogenic effects are almost entirely dependent on CPEB3 degradation.","method":"Co-immunoprecipitation, ubiquitylation assay, ChIP, luciferase reporter assay, shRNA knockdown, overexpression, xenograft mouse model, epistasis rescue experiments","journal":"World journal of surgical oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ubiquitylation assay, Co-IP, epistasis rescue, in vivo xenograft, but single lab study","pmids":["41832516"],"is_preprint":false},{"year":2025,"finding":"CPEB3 binds to STAT3 mRNA and inhibits its translation; reduced CPEB3 in epileptic mice results in elevated STAT3 and p-STAT3, increased STAT3 nuclear translocation, and enhanced STAT3-mediated transcription of GluN1, GluN2A, and GluN2B NMDAR subunits, increasing neuronal excitability.","method":"RNA immunoprecipitation (RIP), chromatin immunoprecipitation (ChIP), AAV-mediated CPEB3 overexpression/knockdown in mice, behavioral epilepsy assays, Western blot, RT-qPCR","journal":"Molecular medicine (Cambridge, Mass.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and ChIP establish direct mRNA binding and downstream transcriptional consequences, in vivo AAV manipulation, but single lab","pmids":["39994587"],"is_preprint":false},{"year":2023,"finding":"Neuralized1-mediated ubiquitination of CPEB3 in spinal dorsal horn neurons promotes production of GluA1, GluA2, and PSD95 and augments GluA1-containing AMPA receptors in the membrane, contributing to neuropathic pain after spinal nerve ligation. Knockdown of spinal CPEB3 or Neuralized1 reduces AMPA receptor expression and mechanical allodynia.","method":"Co-immunoprecipitation (Co-IP), AAV-mediated shRNA knockdown and overexpression in rat spinal cord, Western blot, immunofluorescence, behavioral pain tests","journal":"ACS chemical neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirms interaction, in vivo genetic manipulation with behavioral and molecular readouts, single lab","pmids":["37644621"],"is_preprint":false},{"year":2020,"finding":"CPEB1 and CPEB3 regulate translation of FosB mRNA in the nucleus accumbens following cocaine administration. Dominant-negative CPEB1/3 mice show decreased locomotor sensitization, conditioned place preference, and cocaine-induced synaptic depression in the NAc core. FosB is identified as a novel translational target of CPEBs, and CPEB is reduced after cocaine injections in transgenic mice.","method":"Conditional transgenic dominant-negative CPEB1/3 mouse, behavioral assays (locomotor sensitization, CPP), electrophysiology (synaptic depression), Western blot","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic dominant-negative approach, behavioral and electrophysiological phenotypes, but dominant-negative affects both CPEB1 and CPEB3 simultaneously (cannot isolate CPEB3 alone)","pmids":["32742260"],"is_preprint":false}],"current_model":"CPEB3 is a sequence-specific RNA-binding protein that functions primarily as a translational repressor of multiple target mRNAs (including GluA2/GluA1, PSD95, NMDARs, EGFR, TRPV1, Nr3c1, STAT3, MTDH, JAK1, IL-6R, NFE2L1) by localizing them to P bodies; in its basal state it is SUMOylated, soluble, and repressive, but upon neuronal stimulation (via NMDA receptor activation) it is de-SUMOylated, undergoes prion-like aggregation in a manner dependent on a 49-residue amyloid core (L103–F151), relocates to polysomes to activate translation, and can also be activated by Neuralized1-mediated non-proteolytic ubiquitination or inactivated/cleaved by calpain 2; nuclear CPEB3 suppresses Stat5b-dependent transcription of EGFR, and its nuclear import is facilitated by IPO5 downstream of NMDAR/RanBP1 signaling, while TRAIP-mediated proteasomal degradation of CPEB3 and PKA/CaMKII-mediated phosphorylation of isoforms containing the B-region represent additional layers of regulation."},"narrative":{"mechanistic_narrative":"CPEB3 is a sequence-specific RNA-binding protein that acts predominantly as a translational repressor of target mRNAs and serves as a molecular substrate for the persistence of synaptic plasticity and long-term memory [PMID:17024188, PMID:26074003]. It belongs to a distinct class of CPEBs that recognizes RNA elements unlike those of CPEB1 and represses translation without requiring the AAUAAA element or CPSF [PMID:17024188]; in its basal state it represses targets in part by recruiting the Tob–Caf1 deadenylase complex to promote deadenylation and mRNA decay [PMID:21336257]. Across neurons it suppresses synthesis of plasticity proteins including GluA2/GluA1, PSD95 and NMDA receptors, and its genetic loss elevates these targets while enhancing memory and altering LTP/LTD [PMID:17024188, PMID:24155305, PMID:25404896]. CPEB3 activity is gated by a switchable conformational state: basally it is SUMOylated, soluble, and partitions into P bodies through direct interaction with the P-body component GW182, where target mRNAs are translationally silenced [PMID:26074071, PMID:31416913, PMID:36068334]; neuronal stimulation drives de-SUMOylation and prion-like amyloid aggregation—organized around a defined 49-residue ordered core (L103–F151) within the first prion-like domain—that relocates CPEB3 to polysomes to activate translation, a state required for LTP maintenance and spatial memory [PMID:26074071, PMID:26074003, PMID:40480223, PMID:34081983]. Activation is further controlled by Neuralized1-mediated non-proteolytic ubiquitination, which promotes target synthesis, spine growth and plasticity [PMID:22153079], while calpain 2 cleaves the N-terminal repression domain upon NMDAR activation to de-repress targets [PMID:22711986]. A separate nuclear pool, imported via IPO5 binding to RRM1 downstream of NMDAR/RanBP1 signaling, binds Stat5b and suppresses Stat5b-dependent transcription of EGFR [PMID:22730302, PMID:20639532]. Beyond the nervous system, CPEB3 represses translation of oncogenic targets including IL-6R, JAK1, MTDH and NFE2L1, and its abundance is controlled by TRAIP-mediated proteasomal degradation [PMID:32653013, PMID:32968053, PMID:33146632, PMID:41832516]. The intrinsically disordered N-terminal region lacks stable fold, and PKA/CaMKII phosphorylate B-region–containing isoforms as an additional regulatory layer [PMID:26915047, PMID:27256982, PMID:35658951].","teleology":[{"year":2006,"claim":"Established CPEB3 as a sequence-specific RNA-binding translational repressor distinct from CPEB1, answering whether it functions in classical cytoplasmic polyadenylation.","evidence":"SELEX, footprinting, tethered reporter assays and RNAi in neurons, with GluR2 as an in vivo target","pmids":["17024188"],"confidence":"High","gaps":["Did not define the activation switch from repression to translation","Full target repertoire unknown at this stage"]},{"year":2010,"claim":"Identified a nuclear function for CPEB3 as a transcriptional co-repressor, showing it acts beyond cytoplasmic translation control.","evidence":"Co-IP, reporter assays and RNAi linking nuclear CPEB3 to Stat5b inhibition and EGFR regulation in neurons","pmids":["20639532"],"confidence":"High","gaps":["Mechanism of nuclear import not yet defined","How Stat5b activity is inhibited without affecting DNA binding unresolved"]},{"year":2011,"claim":"Defined two opposing regulatory inputs: deadenylation-based repression and ubiquitin-based activation, clarifying how CPEB3 toggles target fate.","evidence":"Reconstituted CPEB3–Tob–Caf1 ternary complex and dominant-negative analysis; Neuralized1 in vitro ubiquitination with gain/loss-of-function in hippocampal neurons and mice","pmids":["21336257","22153079"],"confidence":"High","gaps":["How non-proteolytic ubiquitination converts CPEB3 to an activator not mechanistically resolved","Coupling between deadenylase recruitment and the SUMO/aggregation switch unknown"]},{"year":2012,"claim":"Placed CPEB3 downstream of NMDAR/calcium signaling via two mechanisms—calpain 2 cleavage of its repression domain and IPO5-mediated nuclear import.","evidence":"Pharmacology/RNAi and domain-specific cleavage assays for calpain 2; Co-IP, domain mapping and RanBP1 manipulation for IPO5/CRM1 trafficking","pmids":["22711986","22730302"],"confidence":"High","gaps":["Relative contribution of cleavage vs. aggregation to activation not quantified","Trigger that partitions CPEB3 between cytoplasmic and nuclear fates unclear"]},{"year":2013,"claim":"Demonstrated through knockout that CPEB3 represses multiple plasticity proteins and constrains memory, establishing its physiological role at glutamatergic synapses.","evidence":"CPEB3 KO mice with behavioral, electrophysiological and Western blot analysis of PSD95, NMDARs, GluA1","pmids":["24155305"],"confidence":"High","gaps":["Did not address the activation-dependent translational role","Did not distinguish direct vs. indirect target regulation"]},{"year":2014,"claim":"Linked CPEB3 loss to CaMKIIα hyperactivation and impaired depotentiation, embedding it in synaptic state-switching circuitry.","evidence":"CPEB3 KO electrophysiology, phospho-GluA1/CaMKIIα Westerns and pharmacological CaMKIIα rescue","pmids":["25404896"],"confidence":"High","gaps":["Whether CaMKIIα effects are direct translational targets or downstream consequences unclear"]},{"year":2015,"claim":"Resolved the central activation switch: SUMOylation keeps CPEB3 soluble and repressive, while de-SUMOylation enables prion-like aggregation that activates translation and sustains memory.","evidence":"SUMOylation and SUMO-fusion assays, yeast prion assays with prion-domain deletion mapping, and CPEB3 KO LTP/spatial memory studies","pmids":["26074071","26074072","26074003"],"confidence":"High","gaps":["Enzymes mediating de-SUMOylation in neurons not identified","Molecular basis by which aggregation activates rather than represses translation incompletely defined"]},{"year":2016,"claim":"Extended CPEB3 repression to diverse targets and tissues (TRPV1 in nociception, GluA2 in cerebellar cells, Megf10 in retina) and identified isoform-specific phosphorylation as a regulatory layer.","evidence":"CPEB3/TRPV1 double-KO epistasis, cerebellar stellate cell electrophysiology, retinal mosaic analysis, and in vitro PKA/CaMKII kinase assays on B-region isoforms","pmids":["26915043","27681423","27822178","26915047","27256982"],"confidence":"High","gaps":["Functional consequence of B-region phosphorylation on aggregation/repression not fully resolved","Several target findings are single-lab"]},{"year":2019,"claim":"Connected the SUMO switch to subcellular compartmentalization, showing CPEB3 distributes between P bodies (repressive) and polysomes (active) and phase-separates on bound mRNA.","evidence":"Subcellular and polysome fractionation, P-body co-localization, and in vitro phase separation of recombinant SUMOylated CPEB3","pmids":["31416913"],"confidence":"High","gaps":["Relationship between liquid phase separation and irreversible amyloid aggregation unresolved","P-body targeting machinery not yet identified at this point"]},{"year":2020,"claim":"Generalized CPEB3 as a tumor-suppressive translational repressor across cancers, repressing IL-6R, JAK1, MTDH and NFE2L1 to restrain oncogenic signaling.","evidence":"RIP/RIP-seq, luciferase 3'UTR assays, KD/OE and a Cpeb3 KO carcinogenesis mouse model","pmids":["32653013","33146632","32968053","32366381"],"confidence":"High","gaps":["Whether cancer targets are repressed by the same SUMO/aggregation switch as neuronal targets untested","Some target reports are single-lab Medium-confidence"]},{"year":2021,"claim":"Broadened the in vivo target set (Nr3c1, maternal mRNAs) and defined roles in fear extinction and early embryogenesis, including an mRNA-stabilizing rather than repressive activity.","evidence":"Genome-wide RIP-seq, CPEB3 KO behavior, calcium imaging and BDNF rescue; oocyte transcriptomics and developmental phenotyping","pmids":["33941859","38786074"],"confidence":"High","gaps":["Determinants of repression vs. stabilization of bound mRNAs unclear","Embryonic mechanism rests on correlative transcriptomics"]},{"year":2022,"claim":"Identified the direct P-body targeting interaction (CPEB3–GW182) and structurally characterized the intrinsically disordered region, mapping the architecture underlying compartmentalization.","evidence":"Microscale thermophoresis defining CPEB3–GW182 binding, RIP/reporter assays for ADAR1 repression, and residue-level NMR of the 426-residue IDR","pmids":["36068334","35658951"],"confidence":"High","gaps":["Structural elements of the IDR not all functionally validated","How GW182 binding integrates with SUMO state unresolved"]},{"year":2023,"claim":"Dissected the prion-like domain's roles: a low-complexity motif directs neuronal RNP-granule localization required for local protein synthesis, and the prion domain interacts with tau.","evidence":"Live imaging with LCM deletion mutants and AMPA trafficking readouts; NMR mapping of PRD1–tau interaction; QBP1 aggregation-inhibition with transgenic mouse memory deficits (preprint)","pmids":["36716374","39908090","bio_10.1101_2025.01.27.635080"],"confidence":"Medium","gaps":["Physiological relevance of CPEB3–tau interaction in vivo untested","QBP1 memory data remain a preprint"]},{"year":2025,"claim":"Delivered atomic-resolution structure of the CPEB3 amyloid core and demonstrated its necessity for correct localization and translational function in neurons.","evidence":"Cryo-EM of fibrils defining the L103–F151 core, cryo-FIB/cryo-ET in neurons, and deletion-mutant functional and localization assays","pmids":["40480223","34081983"],"confidence":"High","gaps":["Whether the in vitro fibril core matches the functional in-cell aggregate not fully established","Association with multivesicular bodies functionally uncharacterized"]},{"year":2026,"claim":"Established TRAIP-mediated proteasomal degradation as a regulator of CPEB3 abundance controlling oncogenic mTORC1 signaling.","evidence":"Co-IP, ubiquitylation assays, epistasis rescue and xenografts in gastric cancer cells","pmids":["41832516"],"confidence":"Medium","gaps":["Single-lab study","Relationship to non-proteolytic ubiquitination by Neuralized1 not reconciled"]},{"year":null,"claim":"How the SUMO state, phase separation, amyloid aggregation, ubiquitination and proteolysis are mechanistically coupled to flip CPEB3 from a repressor to a translational activator on individual target mRNAs remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified biochemical model linking conformational state to repression vs. activation","DeSUMOylating and signaling enzymes acting on neuronal CPEB3 not identified","Determinants distinguishing repressed vs. stabilized targets unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2,14,17,19]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,6,9,10]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[4,5]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,10]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,10]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[8,9,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,6,13]}],"complexes":["CPEB3-Tob-Caf1 deadenylase complex"],"partners":["TOB","CNOT7","NEURL1","IPO5","STAT5B","GW182","TRAIP","CAPN2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NE35","full_name":"Cytoplasmic polyadenylation element-binding protein 3","aliases":[],"length_aa":698,"mass_kda":76.0,"function":"Sequence-specific RNA-binding protein which acts as a translational repressor in the basal unstimulated state but, following neuronal stimulation, acts as a translational activator (By similarity). In contrast to CPEB1, does not bind to the cytoplasmic polyadenylation element (CPE), a uridine-rich sequence element within the mRNA 3'-UTR, but binds to a U-rich loop within a stem-loop structure (By similarity). Required for the consolidation and maintenance of hippocampal-based long term memory (By similarity). In the basal state, binds to the mRNA 3'-UTR of the glutamate receptors GRIA2/GLUR2 mRNA and negatively regulates their translation (By similarity). Also represses the translation of DLG4, GRIN1, GRIN2A and GRIN2B (By similarity). When activated, acts as a translational activator of GRIA1 and GRIA2 (By similarity). In the basal state, suppresses SUMO2 translation but activates it following neuronal stimulation (By similarity). Binds to the 3'-UTR of TRPV1 mRNA and represses TRPV1 translation which is required to maintain normal thermoception (By similarity). Binds actin mRNA, leading to actin translational repression in the basal state and to translational activation following neuronal stimulation (By similarity). Negatively regulates target mRNA levels by binding to TOB1 which recruits CNOT7/CAF1 to a ternary complex and this leads to target mRNA deadenylation and decay (PubMed:21336257). In addition to its role in translation, binds to and inhibits the transcriptional activation activity of STAT5B without affecting its dimerization or DNA-binding activity. This, in turn, represses transcription of the STAT5B target gene EGFR which has been shown to play a role in enhancing learning and memory performance (PubMed:20639532). In contrast to CPEB1, CPEB2 and CPEB4, not required for cell cycle progression (PubMed:26398195)","subcellular_location":"Cytoplasm; Nucleus; Synapse; Cell projection, dendrite; Postsynaptic density","url":"https://www.uniprot.org/uniprotkb/Q8NE35/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CPEB3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CPEB3","total_profiled":1310},"omim":[{"mim_id":"610606","title":"CYTOPLASMIC POLYADENYLATION ELEMENT-BINDING PROTEIN 3; CPEB3","url":"https://www.omim.org/entry/610606"},{"mim_id":"610605","title":"CYTOPLASMIC POLYADENYLATION ELEMENT-BINDING PROTEIN 2; CPEB2","url":"https://www.omim.org/entry/610605"},{"mim_id":"151626","title":"LINE RETROTRANSPOSABLE ELEMENT 1; LRE1","url":"https://www.omim.org/entry/151626"},{"mim_id":"147370","title":"INSULIN-LIKE GROWTH FACTOR I RECEPTOR; IGF1R","url":"https://www.omim.org/entry/147370"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Midbody","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":30.1}],"url":"https://www.proteinatlas.org/search/CPEB3"},"hgnc":{"alias_symbol":["KIAA0940"],"prev_symbol":[]},"alphafold":{"accession":"Q8NE35","domains":[{"cath_id":"3.30.70.330","chopping":"440-533","consensus_level":"high","plddt":91.6607,"start":440,"end":533},{"cath_id":"3.30.70.330","chopping":"536-630","consensus_level":"medium","plddt":93.1105,"start":536,"end":630},{"cath_id":"4.10.640.40","chopping":"633-691","consensus_level":"medium","plddt":84.5673,"start":633,"end":691}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE35","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE35-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NE35-F1-predicted_aligned_error_v6.png","plddt_mean":57.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CPEB3","jax_strain_url":"https://www.jax.org/strain/search?query=CPEB3"},"sequence":{"accession":"Q8NE35","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NE35.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NE35/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NE35"}},"corpus_meta":[{"pmid":"16990549","id":"PMC_16990549","title":"A 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In transfected neurons, CPEB3 represses translation of a reporter RNA in tethered function assays; NMDA receptor activation stimulates translation. CPEB3-mediated translation does not require the AAUAAA cis-element or cleavage and polyadenylation specificity factor (CPSF), unlike CPEB1-induced polyadenylation. CPEB3 binds GluR2 (GluA2) mRNA in vitro and in vivo, and RNAi knockdown of CPEB3 in neurons elevates GluR2 protein levels, establishing CPEB3 as a translational repressor of GluR2.\",\n      \"method\": \"SELEX, RNA structure probing, RNA footprinting, tethered function assays in transfected neurons, in vitro and in vivo RNA binding, RNAi knockdown\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (SELEX, footprinting, in vitro binding, in vivo RIP, functional reporter assay, RNAi knockdown) in a single rigorous study\",\n      \"pmids\": [\"17024188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB3 is activated by Neuralized1, an E3 ubiquitin ligase. Neuralized1-mediated non-proteolytic ubiquitination of CPEB3 in hippocampal cultures leads to growth of new dendritic spines and increased GluA1 and GluA2 (AMPA receptor subunits), which are CPEB3 target mRNAs. Conditional overexpression of Neuralized1 increases GluA1, GluA2, spine number, and functional synapses; inhibition of Neuralized1 reduces these and impairs hippocampal-dependent memory and synaptic plasticity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, hippocampal neuron culture, conditional transgenic mouse overexpression/inhibition, behavioral and electrophysiological assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro ubiquitination, genetic gain- and loss-of-function with defined cellular and behavioral phenotypes, published in Cell\",\n      \"pmids\": [\"22153079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB3 recruits the Caf1 deadenylase to target mRNAs via direct binding to Tob (anti-proliferative protein), forming a ternary CPEB3–Tob–Caf1 complex. The C-terminal RNA-binding domain of CPEB3 binds the C-terminal unstructured region of Tob; Tob then recruits Caf1. CPEB3-accelerated deadenylation and mRNA decay is abrogated by dominant-negative mutants of either Caf1 or Tob.\",\n      \"method\": \"Direct binding assays, co-immunoprecipitation, dominant-negative mutant analysis, deadenylation assay, tethering assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted ternary complex, domain mapping, dominant-negative mutants, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21336257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NMDA receptor activation causes calpain 2-mediated proteolysis of the N-terminal repression motif of CPEB3, but not its C-terminal RNA-binding domain. The cleaved CPEB3 fragment retains RNA binding but fails to repress translation, thereby de-repressing CPEB3 target mRNAs (including EGFR) at the translational level. Calcium influx through NMDARs activates calpain 2, which proteolyzes CPEB3.\",\n      \"method\": \"Pharmacological inhibition, RNAi knockdown of calpain 2, domain-specific cleavage analysis, Western blot, translation assays in NMDA-stimulated neurons\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological and genetic (knockdown) approaches, domain-level mechanism, multiple orthogonal readouts in one study\",\n      \"pmids\": [\"22711986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IPO5 (importin 5) facilitates nuclear import of CPEB3 by binding to the RRM1 domain of CPEB3. CRM1 facilitates nuclear export via a leucine-containing motif of CPEB3. NMDAR signaling increases RanBP1 expression and reduces cytoplasmic GTP-bound Ran, which enhances CPEB3–IPO5 interaction and accelerates nuclear import of CPEB3. In the nucleus, CPEB3 binds Stat5b and suppresses Stat5b-dependent transcription.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, RanBP1 overexpression, pharmacological NMDA stimulation, nuclear fractionation, reporter assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain-level mapping, multiple cellular manipulations (RanBP1 OE, NMDA stimulation), mechanistic pathway placed\",\n      \"pmids\": [\"22730302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CPEB3 interacts with Stat5b in the nucleus and inhibits Stat5b transcriptional activity without disrupting Stat5b dimerization, DNA binding, or nuclear localization. NMDA receptor activation causes nuclear accumulation of CPEB3. EGFR is a target gene transcriptionally activated by Stat5b and negatively regulated by CPEB3 in neurons; CPEB3 knockdown increases EGFR expression and alters EGF-induced downstream signaling kinetics.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, RNAi knockdown, NMDA stimulation, nuclear fractionation, Western blot\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, reporter assay, RNAi knockdown with defined signaling phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"20639532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB3 is SUMOylated in hippocampal neurons in vitro and in vivo under basal (unstimulated) conditions, in which state it is soluble and acts as a translational repressor. Following neuronal stimulation, CPEB3 is de-SUMOylated, forms aggregates/oligomers, and promotes translation of target mRNAs. A chimeric CPEB3 fused to SUMO cannot form aggregates and cannot activate translation of target mRNAs, establishing SUMOylation as an inhibitory constraint on CPEB3 aggregation and activity.\",\n      \"method\": \"SUMOylation assay in neurons (in vitro and in vivo), chimeric SUMO-fusion protein, aggregation assay, translational reporter assay, neuronal stimulation paradigm\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct biochemical modification assay, SUMO-fusion dominant-negative approach, translational assay, in vitro and in vivo corroboration\",\n      \"pmids\": [\"26074071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB3 forms heritable aggregates (a hallmark of prions) when expressed in yeast. Deletion analysis of the CPEB3 prion domain revealed a tripartite organization: two aggregation-promoting domains flanking a regulatory module that mediates interaction with the actin cytoskeleton. CPEB3 aggregation is necessary for its function in mouse neurons, confirming it as a functional prion.\",\n      \"method\": \"Yeast prion assay, deletion analysis, actin interaction assay, mouse neuronal studies\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast prion assay, domain deletion mapping, mouse neuronal functional validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"26074072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPEB3 aggregation and prion-like activity are required for maintenance of hippocampal long-term potentiation and hippocampus-dependent spatial memory. Genetic ablation of CPEB3 impairs maintenance of both. CPEB3 levels and aggregation increase after neuronal activity, supporting a model whereby CPEB3 aggregates function as active translational regulators for memory persistence.\",\n      \"method\": \"CPEB3 knockout mouse, LTP electrophysiology, Morris water maze spatial memory test, Western blot for aggregation state\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined electrophysiological and behavioral phenotypes, aggregation biochemistry, replicated across multiple assays\",\n      \"pmids\": [\"26074003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CPEB3 knockout mice display enhanced hippocampus-dependent memory and facilitated LTD. Molecular analysis shows elevated translational levels of PSD95, NMDA receptors, and GluA1 in CPEB3 KO neurons, establishing CPEB3 as a translational repressor of multiple plasticity-related proteins at glutamatergic synapses.\",\n      \"method\": \"CPEB3 knockout mouse, contextual fear conditioning, Morris water maze, electrophysiology, Western blot, molecular characterization of PSD95, NMDARs, GluA1\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple behavioral and molecular readouts, replicated across assays, independently corroborates translational repressor role\",\n      \"pmids\": [\"24155305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Basal, SUMOylated CPEB3 localizes to P bodies (membraneless cytoplasmic processing bodies enriched in translationally repressed mRNA). After neuronal stimulation, CPEB3 moves to polysomes to promote translation of target mRNAs. SUMOylation state controls this distribution. In vitro, SUMOylated CPEB3 recombinant protein undergoes phase separation when bound to a specific mRNA target.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence co-localization with P body markers, polysome fractionation, in vitro phase separation assay with recombinant SUMOylated CPEB3\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization with functional consequence (P body vs polysome), in vitro phase separation, SUMOylation-dependent mechanism, multiple orthogonal methods\",\n      \"pmids\": [\"31416913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CPEB3 deficiency leads to elevated activation of CaMKIIα, increased Ser831 phosphorylation of GluA1, and slow degradation of PSD95 and GluA1 under NMDA-induced chemical LTD. CPEB3 KO hippocampus shows impaired NMDAR-dependent synaptic depotentiation; pharmacological suppression of CaMKIIα during the depotentiation-initiating phase rescues LTP reversal in KO hippocampus.\",\n      \"method\": \"CPEB3 KO mouse, electrophysiology (depotentiation, c-LTD), Western blot for CaMKIIα activation and phospho-GluA1, pharmacological CaMKIIα inhibition\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with electrophysiological and biochemical readouts, pharmacological rescue, pathway placed through epistasis\",\n      \"pmids\": [\"25404896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CPEB3 directly binds to the 3'UTR of IL-6R mRNA and reduces IL-6R protein levels, thereby decreasing phospho-STAT3 in colorectal cancer cells. CPEB3 knockdown increases IL-6R expression, activates STAT3, and promotes M2-like TAM polarization via increased CCL2 secretion. These findings place CPEB3 upstream of the IL-6R/STAT3 axis as a post-transcriptional repressor.\",\n      \"method\": \"RNA immunoprecipitation, luciferase reporter assay, RIP, CPEB3 overexpression/knockdown, co-culture, Western blot for p-STAT3\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and luciferase reporter confirm direct mRNA binding, Western blot for downstream pathway, but single lab study\",\n      \"pmids\": [\"32653013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NFE2L3 induces CPEB3 gene expression, and CPEB3 then binds to the NFE2L1 3'UTR to repress NFE2L1 mRNA translation, reducing polysome formation on NFE2L1 mRNA. This NFE2L3-CPEB3-NFE2L1 translational repression axis maintains basal proteasome activity in cancer cells.\",\n      \"method\": \"RNAi double knockdown, polysome profiling, reporter assay, Western blot for proteasome subunits and NFE2L1\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling and reporter assay establish translational repression, multiple KD experiments, single lab\",\n      \"pmids\": [\"32366381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CPEB3 binds to the 3'UTR of MTDH mRNA and suppresses its translation in hepatocellular carcinoma cells in vivo and in vitro, inhibiting EMT and metastasis. RNA immunoprecipitation identified transcriptome-wide CPEB3-bound mRNAs; MTDH was confirmed as a direct target. Cpeb3 knockout mice showed increased susceptibility to carcinogen-induced hepatocarcinogenesis and lung metastasis.\",\n      \"method\": \"RNA immunoprecipitation (RIP-seq), luciferase reporter assay (3'UTR binding), Western blot for MTDH, cpeb3 KO mouse, in vivo carcinogenesis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP-seq for target identification, luciferase 3'UTR assay, KO mouse in vivo phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"32968053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CPEB3 suppresses GluA2 protein synthesis in a topologically graded manner in cerebellar stellate cells. Action potentials produce graded dendritic depolarizations that elevate CPEB3 protein at proximal dendrites; CPEB3 then binds GluA2 mRNA and suppresses GluA2 translation, leading to a distance-dependent increase in synaptic GluA2-containing AMPARs. Activity-induced CPEB3 expression requires increased Ca2+ and PKC activation.\",\n      \"method\": \"CPEB3 overexpression/knockdown in mouse cerebellar stellate cells, electrophysiology, live imaging, pharmacological Ca2+ and PKC manipulation, Western blot\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiology and imaging with pharmacological dissection, but predominantly single lab\",\n      \"pmids\": [\"27681423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Stress suppresses GluA1 protein synthesis in cerebellar Bergmann glial cells via an adrenergic/adenylyl cyclase 5 (AC5)/CPEB3 pathway. CPEB3 binds GluA1 mRNA and regulates its translation; mice lacking CPEB3 do not show stress-induced GluA1 reduction, and deletion of AC5 prevents GluA1 suppression. This reduces AMPA receptor-mediated currents and causes retraction of glial lateral processes.\",\n      \"method\": \"CPEB3 knockout mouse, AC5 knockout mouse, β-adrenergic receptor blocker pharmacology, electrophysiology, immunofluorescence, Western blot\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO (CPEB3 and AC5), pharmacological block, electrophysiology and imaging, defined molecular pathway placed\",\n      \"pmids\": [\"32229518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CPEB3 translationally suppresses Nr3c1 (glucocorticoid receptor) mRNA in hippocampal neurons; a genome-wide screen (RIP-seq) of CPEB3-bound transcripts identified Nr3c1 as a target. CPEB3-KO neurons show elevated GR expression, increased corticosterone-induced calcium influx, and decreased BDNF mRNA and protein, linking CPEB3 loss to impaired fear extinction.\",\n      \"method\": \"CPEB3 KO mouse, genome-wide RIP-seq, behavioral fear conditioning/extinction paradigm, Western blot, calcium imaging, intracerebroventricular BDNF delivery rescue\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide RIP-seq target identification, KO mouse with behavioral and biochemical phenotype, rescue experiment\",\n      \"pmids\": [\"33941859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CPEB3 suppresses translation of TRPV1 mRNA in dorsal root ganglia neurons. CPEB3-KO mice show hypersensitivity to noxious heat; CPEB3/TRPV1 double-KO mice phenocopy TRPV1-KO mice with severely impaired thermosensation, establishing CPEB3 as a translational repressor of TRPV1 upstream of thermal nociception.\",\n      \"method\": \"CPEB3 KO mouse, TRPV1 KO mouse, CPEB3/TRPV1 double-KO mouse, conditional KO, behavioral thermal/mechanical nociception tests, Western blot for TRPV1\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via double-KO, conditional KO, behavioral phenotype, pathway placed\",\n      \"pmids\": [\"26915043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB3 interacts with the 3'UTR of ADAR1 mRNA through binding to CPEB nucleotide elements, inhibits ADAR1 translation by localizing ADAR1 mRNA to P bodies, and thereby suppresses ADAR1-mediated RNA editing in gastric cancer cells. Microscale thermophoresis revealed direct interaction between CPEB3 (residues 440–698) and GW182 (residues 403–860), a major P-body component, mediating P-body targeting.\",\n      \"method\": \"RNA immunoprecipitation, luciferase reporter assay (3'UTR), P body co-localization, microscale thermophoresis (direct protein-protein interaction), KO/KD functional assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding quantified by MST, RIP, luciferase 3'UTR assay, P-body localization mechanism, domain-level mapping\",\n      \"pmids\": [\"36068334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CPEB3's low-complexity motif (LCM) mediates protein-protein interactions essential for localization to neuronal DCP1-bodies (RNP granules). After chemical LTP induction, both translation-promoting CPEB3 and translation-inhibiting CPEB1 are packaged into neuronal RNP granules, but only CPEB3 is repackaged at later time points. This localization is critical for CPEB3's functional influence on local protein synthesis (measured as AMPA receptor insertion into the membrane and synaptic localization).\",\n      \"method\": \"Fluorescence microscopy (live imaging and fixed), co-localization with DCP1-body markers, CPEB3 LCM deletion mutants, chemical LTP, AMPA receptor trafficking assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct live imaging of RNP granule dynamics, LCM domain deletion, functional AMPA trafficking readout, multiple orthogonal methods\",\n      \"pmids\": [\"36716374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB3 is increased in FMRP-knockout (Fmr1 KO) hippocampal neurons and acts as an upstream effector of elevated GluA2 mRNA transcription in dendrites. Increased CPEB3 drives elevated GluA2 subunit expression, switches synaptic AMPA receptors from GluA2-lacking (Ca2+-permeable) to GluA2-containing (Ca2+-impermeable) at CA1 inhibitory interneurons, and reduces inhibitory synaptic transmission.\",\n      \"method\": \"Single-molecule mRNA detection (smFISH), Fmr1 KO mouse, CPEB3 knockdown, electrophysiology, Western blot\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — single-molecule imaging, genetic KO and KD, electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"35675768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of amyloid fibrils formed in vitro from the first prion-like domain of human CPEB3 reveals a 49-residue ordered core (L103–F151). CPEB3 lacking this segment forms abnormal puncta in cells, localizes away from P bodies toward stress granules, and lacks the ability to influence protein synthesis in neurons. Cryo-FIB milling and cryo-ET of neuronal cells reveal CPEB3-GFP signal associated with multivesicular bodies and bundled filaments.\",\n      \"method\": \"Cryo-EM structure determination, cryo-focused ion beam milling, cryo-electron tomography in neuronal cells, deletion mutant functional assay, subcellular localization (immunofluorescence/GFP), translation reporter assay, cell viability assay\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure of amyloid core, cryo-ET in intact neurons, domain deletion with functional validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"40480223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CPEB3 stabilizes a subset of maternal mRNAs with long 3'UTRs enriched in cytoplasmic polyadenylation elements; CPEB3-depleted oocytes undergo normal meiosis but show early embryonic arrest due to disrupted transcriptome and aberrant protein expression, leading to failure of embryonic transcription initiation.\",\n      \"method\": \"Cpeb3-mutant mouse oocytes, transcriptomic analysis, protein expression analysis, developmental phenotyping\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined developmental phenotype and transcriptomic evidence, but functional mechanism at molecular level based on correlative transcriptomics\",\n      \"pmids\": [\"38786074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CPEB3 suppresses translation of Megf10 mRNA during the first postnatal week; in CPEB3-KO retinas, elevated MEGF10 expression (a homotypic repulsion mediator) disrupts the mosaic spatial organization of ON starburst amacrine cells. This identifies CPEB3 as a translational repressor of Megf10 RNA with a role in shaping retinal mosaic arrangement.\",\n      \"method\": \"CPEB3 KO mouse, Western blot, immunofluorescence, retinal mosaic analysis\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with molecular and cellular phenotype, single lab, Western blot confirms translational target\",\n      \"pmids\": [\"27822178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CPEB3 functions as a translational repressor of JAK1 mRNA by binding to its 3'UTR, thereby inhibiting JAK/STAT signaling in colorectal cancer cells; CPEB3 knockdown activates JAK-STAT signaling and promotes proliferation and metastasis.\",\n      \"method\": \"RNA-binding protein immunoprecipitation, luciferase reporter assay (3'UTR), CPEB3 overexpression/knockdown, Western blot for JAK/STAT pathway components\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RIP and luciferase reporter confirm direct mRNA binding, functional KD assays, but single lab\",\n      \"pmids\": [\"33146632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss of CPEB3 activity in high-grade gliomas is caused by expression of alternatively spliced variants lacking the B-region, which overlaps with the kinase recognition site, reducing phosphorylation of CPEB3 in tumor samples. Protein Kinase A and CaMKII robustly phosphorylate CPEB3 in vitro and in primary hippocampal neurons, specifically at isoforms containing exon 7 (B-region).\",\n      \"method\": \"In vitro kinase assay (PKA and CaMKII), phosphospecific antibody, splicing/isoform analysis, kainate-induced status epilepticus mouse model, Western blot\",\n      \"journal\": \"PloS one / Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay confirms PKA and CaMKII as writers, phosphospecific antibody validates in neurons, isoform-specific mechanism\",\n      \"pmids\": [\"26915047\", \"27256982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CPEB3 binds to the CPE signal in the p53 mRNA 3'UTR and stabilizes p53 mRNA expression in bladder cancer cells. CPEB3-mediated p53 mRNA stabilization is part of the circKDM1A/miR-889-3p/CPEB3/p53 axis that suppresses bladder cancer progression.\",\n      \"method\": \"Dual-luciferase reporter assay, RIP assay, CPEB3 overexpression/knockdown, Western blot\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase 3'UTR assay and RIP confirm direct RNA binding to p53 3'UTR, but single lab and limited mechanistic follow-up\",\n      \"pmids\": [\"38632984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The first prion domain (PRD1) of CPEB3 interacts with the VQIVYKPVDLSKV segment of tau and inhibits tau-K18 aggregation; this interaction simultaneously enhances PRD1 fibril formation. The PRD1-Q region is specifically responsible for inhibiting tau-K18 aggregation.\",\n      \"method\": \"NMR relaxation spectroscopy, fibril formation assays, subdomain peptide mapping\",\n      \"journal\": \"The journal of physical chemistry. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR residue-specific interaction mapping and aggregation assays, but single lab and no in vivo validation\",\n      \"pmids\": [\"39908090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NMR spectroscopic characterization of the 426-residue intrinsically disordered region (IDR) of human CPEB3 reveals that it lacks stable folded structure. Residues M1–P29 adopt a helical+disordered motif; residues 86–93 and 166–175 form polyproline II helices; residues 200–250 contain three partially populated α-helices; residues 345–355 (NLS) form a modestly populated α-helix potentially mediating STAT5B binding.\",\n      \"method\": \"Solution-state NMR spectroscopy (chemical shift, relaxation), secondary structure analysis\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural characterization with residue-level resolution, but limited functional validation of specific structural elements\",\n      \"pmids\": [\"35658951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The first prion subdomain PRD1 of mouse CPEB3 autonomously forms amyloid fibrils in vitro and punctate-like structures in vivo. A 94-residue PRD1-core and a 23-residue peptide (E124–H145) display high aggregation propensity; solid-state NMR reveals a β-rich core of ~40 amino acids at the N-terminus of PRD1-core.\",\n      \"method\": \"In vitro fibril formation assay, electron microscopy, X-ray diffraction, solution-state and solid-state NMR, deuterium exchange, in vivo puncta formation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple structural methods (EM, XRD, solid-state NMR) plus in vivo validation, defines amyloid core at residue level\",\n      \"pmids\": [\"34081983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CPEB3 prion-like aggregation is inhibited in vitro by the anti-amyloidogenic polyglutamine binding peptide 1 (QBP1-M8) without affecting CPEB3 phase separation. Transgenic mice constitutively expressing QBP1 show impaired consolidation of hippocampal-dependent memories (at 24h) and reduced CPEB3 oligomerization in hippocampal extracts, but no effect on short-term memory.\",\n      \"method\": \"In vitro aggregation inhibition assay, transgenic mouse behavioral phenotyping, biochemical analysis of CPEB3 oligomerization state\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro amyloid inhibition + transgenic mouse with behavioral and biochemical readouts, but preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.01.27.635080\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TRAIP E3 ubiquitin ligase (transcriptionally activated by SOX9) mediates poly-ubiquitylation and proteasomal degradation of CPEB3 in gastric cancer cells. This relieves CPEB3-mediated translational repression of oncogenic targets, leading to hyperactivation of mTORC1 signaling. Epistatic rescue experiments show TRAIP's oncogenic effects are almost entirely dependent on CPEB3 degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assay, ChIP, luciferase reporter assay, shRNA knockdown, overexpression, xenograft mouse model, epistasis rescue experiments\",\n      \"journal\": \"World journal of surgical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ubiquitylation assay, Co-IP, epistasis rescue, in vivo xenograft, but single lab study\",\n      \"pmids\": [\"41832516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CPEB3 binds to STAT3 mRNA and inhibits its translation; reduced CPEB3 in epileptic mice results in elevated STAT3 and p-STAT3, increased STAT3 nuclear translocation, and enhanced STAT3-mediated transcription of GluN1, GluN2A, and GluN2B NMDAR subunits, increasing neuronal excitability.\",\n      \"method\": \"RNA immunoprecipitation (RIP), chromatin immunoprecipitation (ChIP), AAV-mediated CPEB3 overexpression/knockdown in mice, behavioral epilepsy assays, Western blot, RT-qPCR\",\n      \"journal\": \"Molecular medicine (Cambridge, Mass.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and ChIP establish direct mRNA binding and downstream transcriptional consequences, in vivo AAV manipulation, but single lab\",\n      \"pmids\": [\"39994587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Neuralized1-mediated ubiquitination of CPEB3 in spinal dorsal horn neurons promotes production of GluA1, GluA2, and PSD95 and augments GluA1-containing AMPA receptors in the membrane, contributing to neuropathic pain after spinal nerve ligation. Knockdown of spinal CPEB3 or Neuralized1 reduces AMPA receptor expression and mechanical allodynia.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP), AAV-mediated shRNA knockdown and overexpression in rat spinal cord, Western blot, immunofluorescence, behavioral pain tests\",\n      \"journal\": \"ACS chemical neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirms interaction, in vivo genetic manipulation with behavioral and molecular readouts, single lab\",\n      \"pmids\": [\"37644621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CPEB1 and CPEB3 regulate translation of FosB mRNA in the nucleus accumbens following cocaine administration. Dominant-negative CPEB1/3 mice show decreased locomotor sensitization, conditioned place preference, and cocaine-induced synaptic depression in the NAc core. FosB is identified as a novel translational target of CPEBs, and CPEB is reduced after cocaine injections in transgenic mice.\",\n      \"method\": \"Conditional transgenic dominant-negative CPEB1/3 mouse, behavioral assays (locomotor sensitization, CPP), electrophysiology (synaptic depression), Western blot\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic dominant-negative approach, behavioral and electrophysiological phenotypes, but dominant-negative affects both CPEB1 and CPEB3 simultaneously (cannot isolate CPEB3 alone)\",\n      \"pmids\": [\"32742260\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CPEB3 is a sequence-specific RNA-binding protein that functions primarily as a translational repressor of multiple target mRNAs (including GluA2/GluA1, PSD95, NMDARs, EGFR, TRPV1, Nr3c1, STAT3, MTDH, JAK1, IL-6R, NFE2L1) by localizing them to P bodies; in its basal state it is SUMOylated, soluble, and repressive, but upon neuronal stimulation (via NMDA receptor activation) it is de-SUMOylated, undergoes prion-like aggregation in a manner dependent on a 49-residue amyloid core (L103–F151), relocates to polysomes to activate translation, and can also be activated by Neuralized1-mediated non-proteolytic ubiquitination or inactivated/cleaved by calpain 2; nuclear CPEB3 suppresses Stat5b-dependent transcription of EGFR, and its nuclear import is facilitated by IPO5 downstream of NMDAR/RanBP1 signaling, while TRAIP-mediated proteasomal degradation of CPEB3 and PKA/CaMKII-mediated phosphorylation of isoforms containing the B-region represent additional layers of regulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CPEB3 is a sequence-specific RNA-binding protein that acts predominantly as a translational repressor of target mRNAs and serves as a molecular substrate for the persistence of synaptic plasticity and long-term memory [#0, #8]. It belongs to a distinct class of CPEBs that recognizes RNA elements unlike those of CPEB1 and represses translation without requiring the AAUAAA element or CPSF [#0]; in its basal state it represses targets in part by recruiting the Tob\\u2013Caf1 deadenylase complex to promote deadenylation and mRNA decay [#2]. Across neurons it suppresses synthesis of plasticity proteins including GluA2/GluA1, PSD95 and NMDA receptors, and its genetic loss elevates these targets while enhancing memory and altering LTP/LTD [#0, #9, #11]. CPEB3 activity is gated by a switchable conformational state: basally it is SUMOylated, soluble, and partitions into P bodies through direct interaction with the P-body component GW182, where target mRNAs are translationally silenced [#6, #10, #19]; neuronal stimulation drives de-SUMOylation and prion-like amyloid aggregation\\u2014organized around a defined 49-residue ordered core (L103\\u2013F151) within the first prion-like domain\\u2014that relocates CPEB3 to polysomes to activate translation, a state required for LTP maintenance and spatial memory [#6, #8, #22, #30]. Activation is further controlled by Neuralized1-mediated non-proteolytic ubiquitination, which promotes target synthesis, spine growth and plasticity [#1], while calpain 2 cleaves the N-terminal repression domain upon NMDAR activation to de-repress targets [#3]. A separate nuclear pool, imported via IPO5 binding to RRM1 downstream of NMDAR/RanBP1 signaling, binds Stat5b and suppresses Stat5b-dependent transcription of EGFR [#4, #5]. Beyond the nervous system, CPEB3 represses translation of oncogenic targets including IL-6R, JAK1, MTDH and NFE2L1, and its abundance is controlled by TRAIP-mediated proteasomal degradation [#12, #14, #25, #32]. The intrinsically disordered N-terminal region lacks stable fold, and PKA/CaMKII phosphorylate B-region\\u2013containing isoforms as an additional regulatory layer [#26, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established CPEB3 as a sequence-specific RNA-binding translational repressor distinct from CPEB1, answering whether it functions in classical cytoplasmic polyadenylation.\",\n      \"evidence\": \"SELEX, footprinting, tethered reporter assays and RNAi in neurons, with GluR2 as an in vivo target\",\n      \"pmids\": [\"17024188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the activation switch from repression to translation\", \"Full target repertoire unknown at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified a nuclear function for CPEB3 as a transcriptional co-repressor, showing it acts beyond cytoplasmic translation control.\",\n      \"evidence\": \"Co-IP, reporter assays and RNAi linking nuclear CPEB3 to Stat5b inhibition and EGFR regulation in neurons\",\n      \"pmids\": [\"20639532\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of nuclear import not yet defined\", \"How Stat5b activity is inhibited without affecting DNA binding unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined two opposing regulatory inputs: deadenylation-based repression and ubiquitin-based activation, clarifying how CPEB3 toggles target fate.\",\n      \"evidence\": \"Reconstituted CPEB3\\u2013Tob\\u2013Caf1 ternary complex and dominant-negative analysis; Neuralized1 in vitro ubiquitination with gain/loss-of-function in hippocampal neurons and mice\",\n      \"pmids\": [\"21336257\", \"22153079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How non-proteolytic ubiquitination converts CPEB3 to an activator not mechanistically resolved\", \"Coupling between deadenylase recruitment and the SUMO/aggregation switch unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed CPEB3 downstream of NMDAR/calcium signaling via two mechanisms\\u2014calpain 2 cleavage of its repression domain and IPO5-mediated nuclear import.\",\n      \"evidence\": \"Pharmacology/RNAi and domain-specific cleavage assays for calpain 2; Co-IP, domain mapping and RanBP1 manipulation for IPO5/CRM1 trafficking\",\n      \"pmids\": [\"22711986\", \"22730302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of cleavage vs. aggregation to activation not quantified\", \"Trigger that partitions CPEB3 between cytoplasmic and nuclear fates unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated through knockout that CPEB3 represses multiple plasticity proteins and constrains memory, establishing its physiological role at glutamatergic synapses.\",\n      \"evidence\": \"CPEB3 KO mice with behavioral, electrophysiological and Western blot analysis of PSD95, NMDARs, GluA1\",\n      \"pmids\": [\"24155305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address the activation-dependent translational role\", \"Did not distinguish direct vs. indirect target regulation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked CPEB3 loss to CaMKII\\u03b1 hyperactivation and impaired depotentiation, embedding it in synaptic state-switching circuitry.\",\n      \"evidence\": \"CPEB3 KO electrophysiology, phospho-GluA1/CaMKII\\u03b1 Westerns and pharmacological CaMKII\\u03b1 rescue\",\n      \"pmids\": [\"25404896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CaMKII\\u03b1 effects are direct translational targets or downstream consequences unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the central activation switch: SUMOylation keeps CPEB3 soluble and repressive, while de-SUMOylation enables prion-like aggregation that activates translation and sustains memory.\",\n      \"evidence\": \"SUMOylation and SUMO-fusion assays, yeast prion assays with prion-domain deletion mapping, and CPEB3 KO LTP/spatial memory studies\",\n      \"pmids\": [\"26074071\", \"26074072\", \"26074003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymes mediating de-SUMOylation in neurons not identified\", \"Molecular basis by which aggregation activates rather than represses translation incompletely defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended CPEB3 repression to diverse targets and tissues (TRPV1 in nociception, GluA2 in cerebellar cells, Megf10 in retina) and identified isoform-specific phosphorylation as a regulatory layer.\",\n      \"evidence\": \"CPEB3/TRPV1 double-KO epistasis, cerebellar stellate cell electrophysiology, retinal mosaic analysis, and in vitro PKA/CaMKII kinase assays on B-region isoforms\",\n      \"pmids\": [\"26915043\", \"27681423\", \"27822178\", \"26915047\", \"27256982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of B-region phosphorylation on aggregation/repression not fully resolved\", \"Several target findings are single-lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected the SUMO switch to subcellular compartmentalization, showing CPEB3 distributes between P bodies (repressive) and polysomes (active) and phase-separates on bound mRNA.\",\n      \"evidence\": \"Subcellular and polysome fractionation, P-body co-localization, and in vitro phase separation of recombinant SUMOylated CPEB3\",\n      \"pmids\": [\"31416913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between liquid phase separation and irreversible amyloid aggregation unresolved\", \"P-body targeting machinery not yet identified at this point\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Generalized CPEB3 as a tumor-suppressive translational repressor across cancers, repressing IL-6R, JAK1, MTDH and NFE2L1 to restrain oncogenic signaling.\",\n      \"evidence\": \"RIP/RIP-seq, luciferase 3'UTR assays, KD/OE and a Cpeb3 KO carcinogenesis mouse model\",\n      \"pmids\": [\"32653013\", \"33146632\", \"32968053\", \"32366381\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cancer targets are repressed by the same SUMO/aggregation switch as neuronal targets untested\", \"Some target reports are single-lab Medium-confidence\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Broadened the in vivo target set (Nr3c1, maternal mRNAs) and defined roles in fear extinction and early embryogenesis, including an mRNA-stabilizing rather than repressive activity.\",\n      \"evidence\": \"Genome-wide RIP-seq, CPEB3 KO behavior, calcium imaging and BDNF rescue; oocyte transcriptomics and developmental phenotyping\",\n      \"pmids\": [\"33941859\", \"38786074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of repression vs. stabilization of bound mRNAs unclear\", \"Embryonic mechanism rests on correlative transcriptomics\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified the direct P-body targeting interaction (CPEB3\\u2013GW182) and structurally characterized the intrinsically disordered region, mapping the architecture underlying compartmentalization.\",\n      \"evidence\": \"Microscale thermophoresis defining CPEB3\\u2013GW182 binding, RIP/reporter assays for ADAR1 repression, and residue-level NMR of the 426-residue IDR\",\n      \"pmids\": [\"36068334\", \"35658951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural elements of the IDR not all functionally validated\", \"How GW182 binding integrates with SUMO state unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Dissected the prion-like domain's roles: a low-complexity motif directs neuronal RNP-granule localization required for local protein synthesis, and the prion domain interacts with tau.\",\n      \"evidence\": \"Live imaging with LCM deletion mutants and AMPA trafficking readouts; NMR mapping of PRD1\\u2013tau interaction; QBP1 aggregation-inhibition with transgenic mouse memory deficits (preprint)\",\n      \"pmids\": [\"36716374\", \"39908090\", \"bio_10.1101_2025.01.27.635080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of CPEB3\\u2013tau interaction in vivo untested\", \"QBP1 memory data remain a preprint\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Delivered atomic-resolution structure of the CPEB3 amyloid core and demonstrated its necessity for correct localization and translational function in neurons.\",\n      \"evidence\": \"Cryo-EM of fibrils defining the L103\\u2013F151 core, cryo-FIB/cryo-ET in neurons, and deletion-mutant functional and localization assays\",\n      \"pmids\": [\"40480223\", \"34081983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the in vitro fibril core matches the functional in-cell aggregate not fully established\", \"Association with multivesicular bodies functionally uncharacterized\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established TRAIP-mediated proteasomal degradation as a regulator of CPEB3 abundance controlling oncogenic mTORC1 signaling.\",\n      \"evidence\": \"Co-IP, ubiquitylation assays, epistasis rescue and xenografts in gastric cancer cells\",\n      \"pmids\": [\"41832516\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Relationship to non-proteolytic ubiquitination by Neuralized1 not reconciled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the SUMO state, phase separation, amyloid aggregation, ubiquitination and proteolysis are mechanistically coupled to flip CPEB3 from a repressor to a translational activator on individual target mRNAs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified biochemical model linking conformational state to repression vs. activation\", \"DeSUMOylating and signaling enzymes acting on neuronal CPEB3 not identified\", \"Determinants distinguishing repressed vs. stabilized targets unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2, 14, 17, 19]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 6, 9, 10]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [8, 9, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 6, 13]}\n    ],\n    \"complexes\": [\n      \"CPEB3-Tob-Caf1 deadenylase complex\"\n    ],\n    \"partners\": [\n      \"TOB\",\n      \"CNOT7\",\n      \"NEURL1\",\n      \"IPO5\",\n      \"STAT5B\",\n      \"GW182\",\n      \"TRAIP\",\n      \"CAPN2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}