{"gene":"EDC3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2007,"finding":"The N-terminal LSm domain of EDC3 mediates DCP1 binding and P-body localization; crystal structures of Drosophila and human EDC3 LSm domains revealed a divergent Sm fold lacking the N-terminal alpha-helix and disrupted beta4-strand, remaining monomeric in solution; a conserved surface patch is required for DCP1 interaction but not P-body localization; the FDF motif mediates interaction with the C-terminal RecA-like domain of Me31B/DDX6; and the YjeF_N domain enables interaction with DCP2.","method":"NMR/crystal structure determination, mutagenesis, co-immunoprecipitation, P-body localization by fluorescence microscopy","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + NMR + mutagenesis + functional localization assays in a single study","pmids":["17923697"],"is_preprint":false},{"year":2008,"finding":"In Drosophila cells, EDC3 and Trailer Hitch (Tral/LSm15) both interact with DCP1 and Me31B via their LSm and FDF domains, respectively, but only EDC3 (not Tral) associates with the decapping enzyme DCP2; both proteins localize to P-bodies via their LSm domains; the LSm domain of EDC3/Tral is monomeric and adopts a divergent Sm fold.","method":"Co-immunoprecipitation, NMR structure determination, mutational analysis, fluorescence microscopy","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — NMR structure, reciprocal co-IP, mutagenesis, and localization assays combined","pmids":["18765641"],"is_preprint":false},{"year":2008,"finding":"The YjeF_N domain of human EDC3 adopts a divergent Rossmann fold topology and forms a dimer in solution; dimerization is required for efficient RNA binding, P-body formation, and regulation of RPS28B mRNA in yeast.","method":"Crystal structure (2.2 Å), sedimentation velocity/equilibrium analysis, structure-based mutagenesis, P-body fluorescence assay, mRNA decay assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and multiple functional readouts in one study","pmids":["18678652"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of the DDX6 C-terminal RecA-like domain bound to the FDF motif of EDC3 shows the FDF peptide adopts an alpha-helical conformation occupying a groove on DDX6 opposite to the RNA/ATP interface; Tral contains a similar FDF motif and binds the same surface, making EDC3 and Tral interactions with DDX6/Me31B mutually exclusive; mutagenesis of Me31B's FDF-binding surface abolishes P-body accumulation and translational repression.","method":"Crystal structure determination, mutagenesis, competition assays, P-body fluorescence and translational repression assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + mutagenesis + competition assays + functional readouts in single study","pmids":["19285948"],"is_preprint":false},{"year":2010,"finding":"Edc3 binds Dcp2 via a short peptide sequence C-terminal to the Dcp2 catalytic domain; this interaction is required for Edc3 to stimulate Dcp2 decapping activity in vitro, for efficient Dcp2 accumulation in P-bodies, and for efficient degradation of the RPS28B mRNA; by contrast, YRA1 pre-mRNA degradation by Edc3 is independent of this Dcp2-binding region.","method":"In vitro decapping assay, deletion analysis, P-body fluorescence microscopy, mRNA decay assays in yeast","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro decapping reconstitution combined with genetic deletion analysis and multiple functional readouts","pmids":["20086104"],"is_preprint":false},{"year":2010,"finding":"AKT phosphorylates EDC3 on Ser-161 downstream of insulin signaling; this phosphorylation increases 14-3-3 binding to EDC3, causes morphological changes in P-body structures, inhibits microRNA-mediated mRNA post-transcriptional regulation, and alters EDC3 protein-protein interactions.","method":"Quantitative phosphoproteomics, in vitro kinase assay (AKT), site-directed mutagenesis (S161), co-immunoprecipitation with 14-3-3, functional P-body and miRNA reporter assays","journal":"Molecular & cellular proteomics : MCP","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — phosphoproteomics site mapping, kinase assay, mutagenesis, and multiple orthogonal functional assays","pmids":["20051463"],"is_preprint":false},{"year":2011,"finding":"The yeast Edc3 LSm domain binds a short helical leucine-rich motif (HLM) in the disordered C-terminal extension of Dcp2 in an unprecedented manner via a noncanonical surface; Dcp2 contains multiple such HLMs that interact with Edc3; Edc3 stimulates decapping in vitro, likely by preventing the Dcp1:Dcp2 complex from adopting an inactive conformation; in metazoans the HLM is found in Dcp1 rather than Dcp2; the Edc3-related protein Scd6 competes with Edc3 for HLM binding.","method":"Crystal structure of yeast Edc3 LSm-Dcp2 HLM complex, in vitro decapping assay, mutagenesis, P-body localization assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with in vitro decapping assay and mutagenesis","pmids":["22085934"],"is_preprint":false},{"year":2011,"finding":"Edc3 interacts with the N-terminal domain of Upf1 at a site overlapping but not identical to the Upf2-binding site, and this interaction is largely responsible for the indirect Dcp2-Upf1 two-hybrid interaction; Edc3 (along with Pat1, Edc1, Edc2) is not essential for general NMD under normal conditions.","method":"Yeast two-hybrid assay, deletion analysis, NMD reporter assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid with deletion mapping, supported by functional NMD assays, single lab","pmids":["22065998"],"is_preprint":false},{"year":2013,"finding":"Crystal structure (2.8 Å) of yeast Dhh1 bound to the N-terminal domain of Pat1 shows Pat1 wraps around the C-terminal RecA domain of Dhh1 at the FDF-binding site; Pat1 and Edc3 therefore compete for the same surface on Dhh1; both Pat1 and Edc3 also compete with RNA binding to Dhh1; mode of Dhh1-Pat1 recognition is conserved in humans.","method":"Crystal structure, co-immunoprecipitation with structure-based mutants, crosslinking-mass spectrometry RNA mapping, human validation by co-IP","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, mutagenesis, MS-crosslinking, and cross-species co-IP validation in single study","pmids":["23851565"],"is_preprint":false},{"year":2013,"finding":"Edc3 directly and tightly binds the globular core of the Rps28 ribosomal protein through a motif exclusive to Saccharomycetaceae Edc3 proteins; this Rps28-binding motif is required for Edc3-mediated autoregulatory decay of RPS28B mRNA but is dispensable for Edc3's general decapping function and YRA1 pre-mRNA decay regulation.","method":"Biochemical binding assays, mutational analysis, mRNA decay assays, phylogenetic analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assays combined with functional genetic dissection of domain requirements","pmids":["23956223"],"is_preprint":false},{"year":2014,"finding":"Edc3 directly binds the 3'-UTR decay-inducing regulatory element of RPS28B mRNA (not Rps28b as previously thought); the Lsm and YjeF-N domains of Edc3 are both required for RPS28B mRNA decay, while only the Lsm domain is required for YRA1 pre-mRNA decay; Rps28b binds Edc3 and regulates its activity rather than binding mRNA directly.","method":"RNA-binding assays, domain deletion analysis, mRNA decay assays, co-immunoprecipitation in yeast","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RNA binding demonstrated, domain requirements systematically dissected with multiple orthogonal assays","pmids":["24492965"],"is_preprint":false},{"year":2014,"finding":"Human Edc3 directly binds NADH via its YjeF_N domain; both human and yeast Edc3 chemically modify NAD in vitro; mutations predicted to disrupt NAD-related molecule binding/hydrolysis affect mRNA degradation control and P-body composition in vivo.","method":"Crystal structure analysis, in vitro NADH binding assay, in vitro NAD modification assay, mutagenesis, P-body assay, mRNA decay assay","journal":"G3 (Bethesda, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding and enzymatic assays combined with mutagenesis and functional readouts, single lab","pmids":["24504254"],"is_preprint":false},{"year":2015,"finding":"A homozygous missense mutation in human EDC3 (p.Phe54Ser) abolishes its ability to enhance DCP2 decapping at low concentrations and even inhibits DCP2 decapping at high concentrations in vitro, causing intellectual disability in affected individuals.","method":"In vitro decapping assay with mutant EDC3, human genetics (homozygosity mapping)","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro decapping reconstitution with disease-causing variant, single lab","pmids":["25701870"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the active form of yeast K. lactis Dcp1-Dcp2 enzyme bound to product m7GDP and activator Edc3 shows how Edc3 binding to the Dcp2 HLM stabilizes the active conformation of the decapping complex.","method":"Crystal structure determination of Dcp1-Dcp2-Edc3-m7GDP complex","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of the active ternary complex with product analog","pmids":["27694841"],"is_preprint":false},{"year":2018,"finding":"Crystal structure (2.84 Å) of K. lactis Edc1-Dcp1-Dcp2-Edc3 heterotetrameric complex with substrate analog in the Dcp2 active site shows how Edc3 and Edc1 coactivators act simultaneously: Edc1 forms a three-way interface bridging Dcp2 domains to consolidate the active conformation, while Edc3 binds Dcp2 HLM; kinetic data show Dcp2 has selectivity for the first transcribed nucleotide during catalysis.","method":"Crystal structure determination (2.84 Å), kinetic assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with substrate analog plus kinetic validation in single study","pmids":["29559651"],"is_preprint":false},{"year":2021,"finding":"Pim1 and Pim3 protein kinases bind to EDC3 and phosphorylate EDC3 on Ser-161, blocking EDC3 localization to P-bodies; EDC3 S161A mutation markedly decreases prostate cancer cell growth, migration, and invasion in vitro and in xenograft models, associated with reduced integrin β1 and α6 mRNA and protein expression.","method":"Kinase binding and phosphorylation assays, EDC3 S161A mutagenesis, P-body fluorescence microscopy, xenograft models, Western blotting, RT-PCR","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — identified kinase writers, mutagenesis of phosphosite, multiple cellular and in vivo functional readouts","pmids":["33586867"],"is_preprint":false},{"year":2021,"finding":"The C. elegans EDC-3 FDF-FEK motif interacts with the CGH-1 (DDX6 ortholog) RecA2 domain; the binding interface was characterized by homology modeling, ITC, and mutagenesis; EDC-3 and CAR-1/PATR-1 (Tral/Pat1 orthologs) have similar but distinct binding modes on CGH-1 RecA2.","method":"Homology modeling, ITC binding assay, mutagenesis, GST pulldown, co-localization fluorescence microscopy","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ITC quantitative binding, mutagenesis, and GST pulldown, single lab","pmids":["34645931"],"is_preprint":false},{"year":2022,"finding":"Chemical proteomics identified EDC3 Tyr-475 (Y475) as a stress-responsive site; Y475 mutation causes hypo-phosphorylation at S161 and S131, alters protein-protein interactions with DDX6, DCP1A/B, and 14-3-3 proteins, yet this mutant form can rescue the P-body-deficient phenotype of EDC3 knockout cells.","method":"Chemical proteomics (SuTEx probes), mutagenesis, phosphoproteomics, co-immunoprecipitation, P-body fluorescence rescue assay","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical proteomics site identification, mutagenesis, multiple PPI and functional assays, single lab","pmids":["36476517"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, EDC-3 facilitates timely removal of specific embryonic mRNAs (cgh-1, car-1, ifet-1) by reducing their expression levels and preventing excessive accumulation of DCAP-2 condensates in somatic cells; EDC-3 also defines boundaries between P bodies, germ granules, and stress granules; EDC-4 counteracts EDC-3 function.","method":"C. elegans genetic knockouts, fluorescence microscopy of condensate formation, mRNA level measurements","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with specific mRNA and condensate phenotypic readouts, single study","pmids":["39331503"],"is_preprint":false},{"year":2024,"finding":"In S. cerevisiae, Med13 (a Cdk8 kinase module scaffold) translocates to the cytoplasm upon nitrogen starvation and colocalizes with P-bodies, where it recruits Edc3 into P-bodies and orchestrates autophagic degradation of Edc3 through a selective cargo-hitchhiking autophagy pathway using Ksp1 as autophagic receptor; Xrn1 autophagic degradation is Med13-independent.","method":"Live fluorescence microscopy (colocalization), genetic deletion analysis, autophagy assays in yeast","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct colocalization, genetic epistasis, autophagic degradation assays, single lab","pmids":["39320938"],"is_preprint":false},{"year":2025,"finding":"Edc3 and Scd6 act redundantly as decapping activators that recruit Dhh1 to Dcp2; single mutants show limited mRNA decay defects while the double mutant reveals broad redundant targeting of mRNAs for degradation; Edc3/Scd6 also redundantly repress translation of specific transcripts and cooperate with Pat1 to adjust gene expression to nutrient availability.","method":"RNA-seq of single and double mutants, ribosome profiling, mRNA decay assays, metabolic measurements in yeast","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq and ribosome profiling in genetic double mutants with metabolic validation, single lab (peer-reviewed and preprint versions)","pmids":["41289350","39257769"],"is_preprint":false}],"current_model":"EDC3 is a modular mRNA decapping activator and P-body scaffold protein whose LSm domain binds DCP1 (via a conserved noncanonical surface) and mediates P-body localization, whose central FDF motif binds the C-terminal RecA domain of DDX6/Me31B/Dhh1 in a manner mutually exclusive with Tral/Pat1, and whose C-terminal YjeF_N domain dimerizes, binds NADH, and is required for RNA binding and substrate-specific mRNA decay; EDC3 directly stimulates DCP2 decapping activity by binding HLMs in the Dcp2 C-terminal extension to stabilize the active Dcp1-Dcp2 conformation, as revealed by multiple crystal structures of the active decapping complex; EDC3 function is regulated by AKT- and Pim1/3-mediated phosphorylation of Ser-161, which promotes 14-3-3 binding and excludes EDC3 from P-bodies, and by a stress-responsive Tyr-475 site that cross-talks with Ser-161 phosphorylation and modulates interactions with DDX6 and DCP1."},"narrative":{"mechanistic_narrative":"EDC3 is a modular mRNA decapping activator and P-body scaffold that couples decay-enzyme activation to cytoplasmic ribonucleoprotein granule organization [PMID:17923697, PMID:22085934]. Its three domains partition the work: an N-terminal divergent LSm domain that mediates DCP1 binding and P-body localization and that engages a noncanonical helical leucine-rich motif (HLM) in the disordered C-terminal extension of DCP2 [PMID:17923697, PMID:22085934]; a central FDF motif that binds the C-terminal RecA-like domain of the DEAD-box helicase DDX6/Me31B/Dhh1 in a manner mutually exclusive with the related repressors Tral and Pat1 [PMID:17923697, PMID:19285948, PMID:23851565]; and a C-terminal YjeF_N domain that dimerizes, binds NADH, and is required for RNA binding and substrate-specific decay [PMID:18678652, PMID:24504254]. Through HLM engagement, EDC3 stabilizes the active conformation of the DCP1–DCP2 complex to directly stimulate decapping, as captured in crystal structures of the active ternary and Edc1-bridged complexes bound to product or substrate analogs [PMID:22085934, PMID:27694841, PMID:29559651]. EDC3 directs both general and substrate-specific decay, binding the 3'-UTR regulatory element of RPS28B mRNA for autoregulatory decay and acting redundantly with Scd6 to recruit Dhh1 and target broad mRNA populations [PMID:24492965, PMID:41289350, PMID:39257769]. EDC3 activity is gated by phosphorylation: AKT and Pim1/Pim3 phosphorylate Ser-161, promoting 14-3-3 binding and excluding EDC3 from P-bodies, with the Pim-EDC3-S161 axis driving prostate cancer cell growth and invasion [PMID:20051463, PMID:33586867]; a stress-responsive Tyr-475 site cross-talks with S161 and modulates DDX6 and DCP1 interactions [PMID:36476517]. A homozygous EDC3 p.Phe54Ser mutation that abolishes DCP2 stimulation causes intellectual disability [PMID:25701870].","teleology":[{"year":2007,"claim":"Established EDC3 as a multidomain adaptor by assigning each domain a distinct binding partner, explaining how one protein links decapping enzymes, a helicase, and P-body targeting.","evidence":"NMR/crystal structures, mutagenesis, co-IP, and P-body localization of Drosophila and human EDC3 domains","pmids":["17923697"],"confidence":"High","gaps":["Did not show whether DCP2 binding directly stimulates catalysis","Functional consequence of the divergent monomeric LSm fold unresolved"]},{"year":2008,"claim":"Distinguished EDC3 from the paralogous repressor Tral, showing both share LSm/FDF-based interactions but only EDC3 engages the decapping enzyme DCP2.","evidence":"Reciprocal co-IP, NMR structure, mutagenesis, and microscopy in Drosophila cells","pmids":["18765641"],"confidence":"High","gaps":["Mechanistic basis of the EDC3-specific DCP2 association not structurally defined here"]},{"year":2008,"claim":"Defined the YjeF_N domain as a dimerization module linking oligomerization to RNA binding, P-body formation, and substrate-specific decay.","evidence":"Crystal structure, sedimentation analysis, structure-based mutagenesis, P-body and mRNA decay assays","pmids":["18678652"],"confidence":"High","gaps":["Whether the Rossmann-like fold carries enzymatic activity was unaddressed","RNA target specificity conferred by dimerization unknown"]},{"year":2009,"claim":"Revealed the structural basis of FDF–helicase recognition and that EDC3 and Tral compete for the same DDX6 surface, defining mutually exclusive helicase complexes.","evidence":"Crystal structure of DDX6 RecA domain bound to EDC3 FDF, competition and functional assays","pmids":["19285948"],"confidence":"High","gaps":["How exclusivity is regulated in cells not determined","Did not address Pat1 competition"]},{"year":2010,"claim":"Demonstrated that EDC3 binding to a peptide C-terminal to the DCP2 catalytic domain is required to stimulate decapping in vitro and is needed for some but not all substrate decay events.","evidence":"In vitro decapping reconstitution, deletion analysis, P-body microscopy, mRNA decay in yeast","pmids":["20086104"],"confidence":"High","gaps":["Structural mechanism of activation not yet resolved","Why YRA1 decay is independent of this region unexplained"]},{"year":2010,"claim":"Connected EDC3 to insulin/AKT signaling, showing Ser-161 phosphorylation recruits 14-3-3 and remodels P-bodies and miRNA-mediated regulation.","evidence":"Phosphoproteomics, AKT kinase assay, S161 mutagenesis, 14-3-3 co-IP, reporter assays","pmids":["20051463"],"confidence":"High","gaps":["Direct effect of phosphorylation on decapping activity not measured","Range of regulated mRNAs not defined"]},{"year":2011,"claim":"Defined the noncanonical LSm–HLM interaction mode and proposed that EDC3 activates decapping by preventing the inactive DCP1:DCP2 conformation, with Scd6 as a competitor.","evidence":"Crystal structure of Edc3 LSm–Dcp2 HLM complex, in vitro decapping, mutagenesis","pmids":["22085934"],"confidence":"High","gaps":["Direct structural proof of the active conformation came later","Metazoan HLM-on-DCP1 functional consequences not tested here"]},{"year":2011,"claim":"Placed EDC3 at the interface with NMD machinery by mapping an Upf1 N-terminal binding site, while showing EDC3 is dispensable for general NMD.","evidence":"Yeast two-hybrid, deletion mapping, NMD reporter assays","pmids":["22065998"],"confidence":"Medium","gaps":["Yeast two-hybrid without reciprocal biochemical validation","Functional role of the Upf1 interaction undefined"]},{"year":2013,"claim":"Showed Pat1 binds the same DDX6/Dhh1 surface as EDC3, extending the competition model and identifying RNA-competitive binding by both factors.","evidence":"Crystal structure of Dhh1–Pat1, mutant co-IP, crosslinking-MS RNA mapping, human co-IP","pmids":["23851565"],"confidence":"High","gaps":["Cellular switching between Pat1- and Edc3-bound helicase states unresolved"]},{"year":2013,"claim":"Identified a lineage-specific Rps28-binding motif on Edc3 required for RPS28B autoregulatory decay but not general decapping, distinguishing dedicated from housekeeping functions.","evidence":"Biochemical binding, mutagenesis, mRNA decay, phylogenetics","pmids":["23956223"],"confidence":"High","gaps":["Initially attributed substrate recognition to Rps28 binding, later revised"]},{"year":2014,"claim":"Revised the RPS28B model by showing Edc3 directly binds the mRNA 3'-UTR element, with Rps28b acting as a regulator of Edc3 rather than the RNA-binding bridge.","evidence":"RNA-binding assays, domain deletion, mRNA decay, co-IP in yeast","pmids":["24492965"],"confidence":"High","gaps":["Sequence/structural determinants of the 3'-UTR element recognition not mapped"]},{"year":2014,"claim":"Showed the YjeF_N domain binds NADH and can chemically modify NAD, linking a metabolite-binding activity to decay control and P-body composition.","evidence":"Crystal structure, in vitro NADH binding and NAD modification, mutagenesis, functional assays","pmids":["24504254"],"confidence":"Medium","gaps":["Physiological substrate and product of the NAD modification unknown","Whether NADH binding regulates decapping in vivo unresolved","Single lab"]},{"year":2015,"claim":"Provided a direct gene-disease link by showing a p.Phe54Ser variant that abolishes DCP2 stimulation causes intellectual disability.","evidence":"In vitro decapping with mutant EDC3 and homozygosity mapping in patients","pmids":["25701870"],"confidence":"Medium","gaps":["Mechanism connecting decapping defect to neurodevelopmental phenotype unknown","Single family/lab"]},{"year":2016,"claim":"Captured the active decapping complex bound to Edc3 and product, providing direct structural proof that HLM binding stabilizes the catalytically competent DCP1-DCP2 conformation.","evidence":"Crystal structure of Dcp1-Dcp2-Edc3-m7GDP complex","pmids":["27694841"],"confidence":"High","gaps":["Dynamics of the conformational switch in solution not addressed"]},{"year":2018,"claim":"Showed how Edc3 and Edc1 coactivators act simultaneously on Dcp2, with Edc1 bridging domains and Edc3 binding the HLM, and revealed substrate nucleotide selectivity.","evidence":"Crystal structure of Edc1-Dcp1-Dcp2-Edc3 with substrate analog, kinetics","pmids":["29559651"],"confidence":"High","gaps":["Order and kinetics of coactivator assembly in cells unresolved"]},{"year":2021,"claim":"Identified Pim1/Pim3 as S161 kinases and tied the EDC3 phospho-switch to prostate cancer growth and integrin mRNA regulation, extending the AKT axis to oncogenic signaling.","evidence":"Kinase assays, S161A mutagenesis, P-body microscopy, xenografts, Western/RT-PCR","pmids":["33586867"],"confidence":"High","gaps":["Direct mechanism linking P-body exclusion to integrin mRNA stabilization not fully resolved"]},{"year":2021,"claim":"Defined the FDF-FEK helicase-binding mode in C. elegans EDC-3, confirming conserved but distinct DDX6-family engagement relative to Tral/Pat1 orthologs.","evidence":"Homology modeling, ITC, mutagenesis, GST pulldown, microscopy","pmids":["34645931"],"confidence":"Medium","gaps":["No experimental structure; single lab","Functional consequences in vivo not deeply tested"]},{"year":2022,"claim":"Discovered a stress-responsive Tyr-475 site that cross-talks with S161/S131 phosphorylation and remodels DDX6, DCP1, and 14-3-3 interactions while still supporting P-body formation.","evidence":"Chemical proteomics (SuTEx), mutagenesis, phosphoproteomics, co-IP, P-body rescue","pmids":["36476517"],"confidence":"Medium","gaps":["Tyr-475 kinase/writer not identified","Functional output of the phospho cross-talk unclear","Single lab"]},{"year":2024,"claim":"Defined an organismal role in embryonic mRNA clearance and granule boundary maintenance, with EDC-4 antagonism, showing EDC3 shapes condensate identity in vivo.","evidence":"C. elegans knockouts, condensate microscopy, mRNA level measurements","pmids":["39331503"],"confidence":"Medium","gaps":["Molecular basis of granule boundary definition unresolved","Single study"]},{"year":2024,"claim":"Revealed regulated turnover of Edc3 itself via Med13-dependent cargo-hitchhiking autophagy upon nitrogen starvation, adding a degradation layer to EDC3 regulation.","evidence":"Live colocalization microscopy, genetic deletions, autophagy assays in yeast","pmids":["39320938"],"confidence":"Medium","gaps":["Whether this turnover pathway is conserved in metazoans unknown","Single lab"]},{"year":2025,"claim":"Established functional redundancy with Scd6 in recruiting Dhh1 to Dcp2, explaining why single-mutant decay defects are mild and linking decay/translation control to nutrient availability.","evidence":"RNA-seq and ribosome profiling of single/double mutants, decay and metabolic assays in yeast","pmids":["41289350","39257769"],"confidence":"Medium","gaps":["Selection of redundant vs unique targets not defined","Conservation of redundancy in metazoans untested"]},{"year":null,"claim":"The physiological function of EDC3's NAD/NADH binding and the regulatory logic integrating S161, S131, and Y475 phosphorylation with decapping activity remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified endogenous substrate for the YjeF_N NAD activity","No structure of phosphorylated EDC3 or its 14-3-3 complex","Mechanism coupling P-body exclusion to specific mRNA stabilization undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6,13,14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,6]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,10]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1,5,15]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,6,13,20]}],"complexes":["DCP1-DCP2 decapping complex","P-body"],"partners":["DCP2","DCP1","DDX6","ME31B","14-3-3","PIM1","PIM3","UPF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96F86","full_name":"Enhancer of mRNA-decapping protein 3","aliases":["LSM16 homolog","YjeF N-terminal domain-containing protein 2","YjeF_N2","hYjeF_N2","YjeF domain-containing protein 1"],"length_aa":508,"mass_kda":56.1,"function":"Binds single-stranded RNA. Involved in the process of mRNA degradation and in the positive regulation of mRNA decapping. May play a role in spermiogenesis and oogenesis","subcellular_location":"Cytoplasm, P-body","url":"https://www.uniprot.org/uniprotkb/Q96F86/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EDC3","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000179151","cell_line_id":"CID000833","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"vesicles","grade":3},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"DCP1A","stoichiometry":10.0},{"gene":"DDX6","stoichiometry":10.0},{"gene":"EDC4","stoichiometry":4.0},{"gene":"ARHGAP18","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2},{"gene":"CLTB","stoichiometry":0.2},{"gene":"DCP1B","stoichiometry":0.2},{"gene":"ALDH18A1","stoichiometry":0.2},{"gene":"YWHAE","stoichiometry":0.2},{"gene":"HNRNPA2B1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000833","total_profiled":1310},"omim":[{"mim_id":"616460","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 50; MRT50","url":"https://www.omim.org/entry/616460"},{"mim_id":"616459","title":"AL-RAQAD SYNDROME; ARS","url":"https://www.omim.org/entry/616459"},{"mim_id":"610534","title":"DECAPPING ENZYME, SCAVENGER; DCPS","url":"https://www.omim.org/entry/610534"},{"mim_id":"609844","title":"DECAPPING mRNA 2; DCP2","url":"https://www.omim.org/entry/609844"},{"mim_id":"609842","title":"ENHANCER OF mRNA DECAPPING 3; EDC3","url":"https://www.omim.org/entry/609842"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytoplasmic bodies","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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binding and P-body localization; crystal structures of Drosophila and human EDC3 LSm domains revealed a divergent Sm fold lacking the N-terminal alpha-helix and disrupted beta4-strand, remaining monomeric in solution; a conserved surface patch is required for DCP1 interaction but not P-body localization; the FDF motif mediates interaction with the C-terminal RecA-like domain of Me31B/DDX6; and the YjeF_N domain enables interaction with DCP2.\",\n      \"method\": \"NMR/crystal structure determination, mutagenesis, co-immunoprecipitation, P-body localization by fluorescence microscopy\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + NMR + mutagenesis + functional localization assays in a single study\",\n      \"pmids\": [\"17923697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Drosophila cells, EDC3 and Trailer Hitch (Tral/LSm15) both interact with DCP1 and Me31B via their LSm and FDF domains, respectively, but only EDC3 (not Tral) associates with the decapping enzyme DCP2; both proteins localize to P-bodies via their LSm domains; the LSm domain of EDC3/Tral is monomeric and adopts a divergent Sm fold.\",\n      \"method\": \"Co-immunoprecipitation, NMR structure determination, mutational analysis, fluorescence microscopy\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — NMR structure, reciprocal co-IP, mutagenesis, and localization assays combined\",\n      \"pmids\": [\"18765641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The YjeF_N domain of human EDC3 adopts a divergent Rossmann fold topology and forms a dimer in solution; dimerization is required for efficient RNA binding, P-body formation, and regulation of RPS28B mRNA in yeast.\",\n      \"method\": \"Crystal structure (2.2 Å), sedimentation velocity/equilibrium analysis, structure-based mutagenesis, P-body fluorescence assay, mRNA decay assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and multiple functional readouts in one study\",\n      \"pmids\": [\"18678652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of the DDX6 C-terminal RecA-like domain bound to the FDF motif of EDC3 shows the FDF peptide adopts an alpha-helical conformation occupying a groove on DDX6 opposite to the RNA/ATP interface; Tral contains a similar FDF motif and binds the same surface, making EDC3 and Tral interactions with DDX6/Me31B mutually exclusive; mutagenesis of Me31B's FDF-binding surface abolishes P-body accumulation and translational repression.\",\n      \"method\": \"Crystal structure determination, mutagenesis, competition assays, P-body fluorescence and translational repression assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + mutagenesis + competition assays + functional readouts in single study\",\n      \"pmids\": [\"19285948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Edc3 binds Dcp2 via a short peptide sequence C-terminal to the Dcp2 catalytic domain; this interaction is required for Edc3 to stimulate Dcp2 decapping activity in vitro, for efficient Dcp2 accumulation in P-bodies, and for efficient degradation of the RPS28B mRNA; by contrast, YRA1 pre-mRNA degradation by Edc3 is independent of this Dcp2-binding region.\",\n      \"method\": \"In vitro decapping assay, deletion analysis, P-body fluorescence microscopy, mRNA decay assays in yeast\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro decapping reconstitution combined with genetic deletion analysis and multiple functional readouts\",\n      \"pmids\": [\"20086104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AKT phosphorylates EDC3 on Ser-161 downstream of insulin signaling; this phosphorylation increases 14-3-3 binding to EDC3, causes morphological changes in P-body structures, inhibits microRNA-mediated mRNA post-transcriptional regulation, and alters EDC3 protein-protein interactions.\",\n      \"method\": \"Quantitative phosphoproteomics, in vitro kinase assay (AKT), site-directed mutagenesis (S161), co-immunoprecipitation with 14-3-3, functional P-body and miRNA reporter assays\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — phosphoproteomics site mapping, kinase assay, mutagenesis, and multiple orthogonal functional assays\",\n      \"pmids\": [\"20051463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The yeast Edc3 LSm domain binds a short helical leucine-rich motif (HLM) in the disordered C-terminal extension of Dcp2 in an unprecedented manner via a noncanonical surface; Dcp2 contains multiple such HLMs that interact with Edc3; Edc3 stimulates decapping in vitro, likely by preventing the Dcp1:Dcp2 complex from adopting an inactive conformation; in metazoans the HLM is found in Dcp1 rather than Dcp2; the Edc3-related protein Scd6 competes with Edc3 for HLM binding.\",\n      \"method\": \"Crystal structure of yeast Edc3 LSm-Dcp2 HLM complex, in vitro decapping assay, mutagenesis, P-body localization assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with in vitro decapping assay and mutagenesis\",\n      \"pmids\": [\"22085934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Edc3 interacts with the N-terminal domain of Upf1 at a site overlapping but not identical to the Upf2-binding site, and this interaction is largely responsible for the indirect Dcp2-Upf1 two-hybrid interaction; Edc3 (along with Pat1, Edc1, Edc2) is not essential for general NMD under normal conditions.\",\n      \"method\": \"Yeast two-hybrid assay, deletion analysis, NMD reporter assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid with deletion mapping, supported by functional NMD assays, single lab\",\n      \"pmids\": [\"22065998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure (2.8 Å) of yeast Dhh1 bound to the N-terminal domain of Pat1 shows Pat1 wraps around the C-terminal RecA domain of Dhh1 at the FDF-binding site; Pat1 and Edc3 therefore compete for the same surface on Dhh1; both Pat1 and Edc3 also compete with RNA binding to Dhh1; mode of Dhh1-Pat1 recognition is conserved in humans.\",\n      \"method\": \"Crystal structure, co-immunoprecipitation with structure-based mutants, crosslinking-mass spectrometry RNA mapping, human validation by co-IP\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, mutagenesis, MS-crosslinking, and cross-species co-IP validation in single study\",\n      \"pmids\": [\"23851565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Edc3 directly and tightly binds the globular core of the Rps28 ribosomal protein through a motif exclusive to Saccharomycetaceae Edc3 proteins; this Rps28-binding motif is required for Edc3-mediated autoregulatory decay of RPS28B mRNA but is dispensable for Edc3's general decapping function and YRA1 pre-mRNA decay regulation.\",\n      \"method\": \"Biochemical binding assays, mutational analysis, mRNA decay assays, phylogenetic analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assays combined with functional genetic dissection of domain requirements\",\n      \"pmids\": [\"23956223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Edc3 directly binds the 3'-UTR decay-inducing regulatory element of RPS28B mRNA (not Rps28b as previously thought); the Lsm and YjeF-N domains of Edc3 are both required for RPS28B mRNA decay, while only the Lsm domain is required for YRA1 pre-mRNA decay; Rps28b binds Edc3 and regulates its activity rather than binding mRNA directly.\",\n      \"method\": \"RNA-binding assays, domain deletion analysis, mRNA decay assays, co-immunoprecipitation in yeast\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RNA binding demonstrated, domain requirements systematically dissected with multiple orthogonal assays\",\n      \"pmids\": [\"24492965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human Edc3 directly binds NADH via its YjeF_N domain; both human and yeast Edc3 chemically modify NAD in vitro; mutations predicted to disrupt NAD-related molecule binding/hydrolysis affect mRNA degradation control and P-body composition in vivo.\",\n      \"method\": \"Crystal structure analysis, in vitro NADH binding assay, in vitro NAD modification assay, mutagenesis, P-body assay, mRNA decay assay\",\n      \"journal\": \"G3 (Bethesda, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding and enzymatic assays combined with mutagenesis and functional readouts, single lab\",\n      \"pmids\": [\"24504254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A homozygous missense mutation in human EDC3 (p.Phe54Ser) abolishes its ability to enhance DCP2 decapping at low concentrations and even inhibits DCP2 decapping at high concentrations in vitro, causing intellectual disability in affected individuals.\",\n      \"method\": \"In vitro decapping assay with mutant EDC3, human genetics (homozygosity mapping)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro decapping reconstitution with disease-causing variant, single lab\",\n      \"pmids\": [\"25701870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the active form of yeast K. lactis Dcp1-Dcp2 enzyme bound to product m7GDP and activator Edc3 shows how Edc3 binding to the Dcp2 HLM stabilizes the active conformation of the decapping complex.\",\n      \"method\": \"Crystal structure determination of Dcp1-Dcp2-Edc3-m7GDP complex\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of the active ternary complex with product analog\",\n      \"pmids\": [\"27694841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure (2.84 Å) of K. lactis Edc1-Dcp1-Dcp2-Edc3 heterotetrameric complex with substrate analog in the Dcp2 active site shows how Edc3 and Edc1 coactivators act simultaneously: Edc1 forms a three-way interface bridging Dcp2 domains to consolidate the active conformation, while Edc3 binds Dcp2 HLM; kinetic data show Dcp2 has selectivity for the first transcribed nucleotide during catalysis.\",\n      \"method\": \"Crystal structure determination (2.84 Å), kinetic assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with substrate analog plus kinetic validation in single study\",\n      \"pmids\": [\"29559651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Pim1 and Pim3 protein kinases bind to EDC3 and phosphorylate EDC3 on Ser-161, blocking EDC3 localization to P-bodies; EDC3 S161A mutation markedly decreases prostate cancer cell growth, migration, and invasion in vitro and in xenograft models, associated with reduced integrin β1 and α6 mRNA and protein expression.\",\n      \"method\": \"Kinase binding and phosphorylation assays, EDC3 S161A mutagenesis, P-body fluorescence microscopy, xenograft models, Western blotting, RT-PCR\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identified kinase writers, mutagenesis of phosphosite, multiple cellular and in vivo functional readouts\",\n      \"pmids\": [\"33586867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The C. elegans EDC-3 FDF-FEK motif interacts with the CGH-1 (DDX6 ortholog) RecA2 domain; the binding interface was characterized by homology modeling, ITC, and mutagenesis; EDC-3 and CAR-1/PATR-1 (Tral/Pat1 orthologs) have similar but distinct binding modes on CGH-1 RecA2.\",\n      \"method\": \"Homology modeling, ITC binding assay, mutagenesis, GST pulldown, co-localization fluorescence microscopy\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ITC quantitative binding, mutagenesis, and GST pulldown, single lab\",\n      \"pmids\": [\"34645931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Chemical proteomics identified EDC3 Tyr-475 (Y475) as a stress-responsive site; Y475 mutation causes hypo-phosphorylation at S161 and S131, alters protein-protein interactions with DDX6, DCP1A/B, and 14-3-3 proteins, yet this mutant form can rescue the P-body-deficient phenotype of EDC3 knockout cells.\",\n      \"method\": \"Chemical proteomics (SuTEx probes), mutagenesis, phosphoproteomics, co-immunoprecipitation, P-body fluorescence rescue assay\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical proteomics site identification, mutagenesis, multiple PPI and functional assays, single lab\",\n      \"pmids\": [\"36476517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, EDC-3 facilitates timely removal of specific embryonic mRNAs (cgh-1, car-1, ifet-1) by reducing their expression levels and preventing excessive accumulation of DCAP-2 condensates in somatic cells; EDC-3 also defines boundaries between P bodies, germ granules, and stress granules; EDC-4 counteracts EDC-3 function.\",\n      \"method\": \"C. elegans genetic knockouts, fluorescence microscopy of condensate formation, mRNA level measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with specific mRNA and condensate phenotypic readouts, single study\",\n      \"pmids\": [\"39331503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In S. cerevisiae, Med13 (a Cdk8 kinase module scaffold) translocates to the cytoplasm upon nitrogen starvation and colocalizes with P-bodies, where it recruits Edc3 into P-bodies and orchestrates autophagic degradation of Edc3 through a selective cargo-hitchhiking autophagy pathway using Ksp1 as autophagic receptor; Xrn1 autophagic degradation is Med13-independent.\",\n      \"method\": \"Live fluorescence microscopy (colocalization), genetic deletion analysis, autophagy assays in yeast\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct colocalization, genetic epistasis, autophagic degradation assays, single lab\",\n      \"pmids\": [\"39320938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Edc3 and Scd6 act redundantly as decapping activators that recruit Dhh1 to Dcp2; single mutants show limited mRNA decay defects while the double mutant reveals broad redundant targeting of mRNAs for degradation; Edc3/Scd6 also redundantly repress translation of specific transcripts and cooperate with Pat1 to adjust gene expression to nutrient availability.\",\n      \"method\": \"RNA-seq of single and double mutants, ribosome profiling, mRNA decay assays, metabolic measurements in yeast\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq and ribosome profiling in genetic double mutants with metabolic validation, single lab (peer-reviewed and preprint versions)\",\n      \"pmids\": [\"41289350\", \"39257769\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EDC3 is a modular mRNA decapping activator and P-body scaffold protein whose LSm domain binds DCP1 (via a conserved noncanonical surface) and mediates P-body localization, whose central FDF motif binds the C-terminal RecA domain of DDX6/Me31B/Dhh1 in a manner mutually exclusive with Tral/Pat1, and whose C-terminal YjeF_N domain dimerizes, binds NADH, and is required for RNA binding and substrate-specific mRNA decay; EDC3 directly stimulates DCP2 decapping activity by binding HLMs in the Dcp2 C-terminal extension to stabilize the active Dcp1-Dcp2 conformation, as revealed by multiple crystal structures of the active decapping complex; EDC3 function is regulated by AKT- and Pim1/3-mediated phosphorylation of Ser-161, which promotes 14-3-3 binding and excludes EDC3 from P-bodies, and by a stress-responsive Tyr-475 site that cross-talks with Ser-161 phosphorylation and modulates interactions with DDX6 and DCP1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EDC3 is a modular mRNA decapping activator and P-body scaffold that couples decay-enzyme activation to cytoplasmic ribonucleoprotein granule organization [#0, #6]. Its three domains partition the work: an N-terminal divergent LSm domain that mediates DCP1 binding and P-body localization and that engages a noncanonical helical leucine-rich motif (HLM) in the disordered C-terminal extension of DCP2 [#0, #6]; a central FDF motif that binds the C-terminal RecA-like domain of the DEAD-box helicase DDX6/Me31B/Dhh1 in a manner mutually exclusive with the related repressors Tral and Pat1 [#0, #3, #8]; and a C-terminal YjeF_N domain that dimerizes, binds NADH, and is required for RNA binding and substrate-specific decay [#2, #11]. Through HLM engagement, EDC3 stabilizes the active conformation of the DCP1–DCP2 complex to directly stimulate decapping, as captured in crystal structures of the active ternary and Edc1-bridged complexes bound to product or substrate analogs [#6, #13, #14]. EDC3 directs both general and substrate-specific decay, binding the 3'-UTR regulatory element of RPS28B mRNA for autoregulatory decay and acting redundantly with Scd6 to recruit Dhh1 and target broad mRNA populations [#10, #20]. EDC3 activity is gated by phosphorylation: AKT and Pim1/Pim3 phosphorylate Ser-161, promoting 14-3-3 binding and excluding EDC3 from P-bodies, with the Pim-EDC3-S161 axis driving prostate cancer cell growth and invasion [#5, #15]; a stress-responsive Tyr-475 site cross-talks with S161 and modulates DDX6 and DCP1 interactions [#17]. A homozygous EDC3 p.Phe54Ser mutation that abolishes DCP2 stimulation causes intellectual disability [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established EDC3 as a multidomain adaptor by assigning each domain a distinct binding partner, explaining how one protein links decapping enzymes, a helicase, and P-body targeting.\",\n      \"evidence\": \"NMR/crystal structures, mutagenesis, co-IP, and P-body localization of Drosophila and human EDC3 domains\",\n      \"pmids\": [\"17923697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show whether DCP2 binding directly stimulates catalysis\", \"Functional consequence of the divergent monomeric LSm fold unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Distinguished EDC3 from the paralogous repressor Tral, showing both share LSm/FDF-based interactions but only EDC3 engages the decapping enzyme DCP2.\",\n      \"evidence\": \"Reciprocal co-IP, NMR structure, mutagenesis, and microscopy in Drosophila cells\",\n      \"pmids\": [\"18765641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis of the EDC3-specific DCP2 association not structurally defined here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the YjeF_N domain as a dimerization module linking oligomerization to RNA binding, P-body formation, and substrate-specific decay.\",\n      \"evidence\": \"Crystal structure, sedimentation analysis, structure-based mutagenesis, P-body and mRNA decay assays\",\n      \"pmids\": [\"18678652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the Rossmann-like fold carries enzymatic activity was unaddressed\", \"RNA target specificity conferred by dimerization unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed the structural basis of FDF–helicase recognition and that EDC3 and Tral compete for the same DDX6 surface, defining mutually exclusive helicase complexes.\",\n      \"evidence\": \"Crystal structure of DDX6 RecA domain bound to EDC3 FDF, competition and functional assays\",\n      \"pmids\": [\"19285948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How exclusivity is regulated in cells not determined\", \"Did not address Pat1 competition\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated that EDC3 binding to a peptide C-terminal to the DCP2 catalytic domain is required to stimulate decapping in vitro and is needed for some but not all substrate decay events.\",\n      \"evidence\": \"In vitro decapping reconstitution, deletion analysis, P-body microscopy, mRNA decay in yeast\",\n      \"pmids\": [\"20086104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of activation not yet resolved\", \"Why YRA1 decay is independent of this region unexplained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected EDC3 to insulin/AKT signaling, showing Ser-161 phosphorylation recruits 14-3-3 and remodels P-bodies and miRNA-mediated regulation.\",\n      \"evidence\": \"Phosphoproteomics, AKT kinase assay, S161 mutagenesis, 14-3-3 co-IP, reporter assays\",\n      \"pmids\": [\"20051463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct effect of phosphorylation on decapping activity not measured\", \"Range of regulated mRNAs not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the noncanonical LSm–HLM interaction mode and proposed that EDC3 activates decapping by preventing the inactive DCP1:DCP2 conformation, with Scd6 as a competitor.\",\n      \"evidence\": \"Crystal structure of Edc3 LSm–Dcp2 HLM complex, in vitro decapping, mutagenesis\",\n      \"pmids\": [\"22085934\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct structural proof of the active conformation came later\", \"Metazoan HLM-on-DCP1 functional consequences not tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed EDC3 at the interface with NMD machinery by mapping an Upf1 N-terminal binding site, while showing EDC3 is dispensable for general NMD.\",\n      \"evidence\": \"Yeast two-hybrid, deletion mapping, NMD reporter assays\",\n      \"pmids\": [\"22065998\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast two-hybrid without reciprocal biochemical validation\", \"Functional role of the Upf1 interaction undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed Pat1 binds the same DDX6/Dhh1 surface as EDC3, extending the competition model and identifying RNA-competitive binding by both factors.\",\n      \"evidence\": \"Crystal structure of Dhh1–Pat1, mutant co-IP, crosslinking-MS RNA mapping, human co-IP\",\n      \"pmids\": [\"23851565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular switching between Pat1- and Edc3-bound helicase states unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified a lineage-specific Rps28-binding motif on Edc3 required for RPS28B autoregulatory decay but not general decapping, distinguishing dedicated from housekeeping functions.\",\n      \"evidence\": \"Biochemical binding, mutagenesis, mRNA decay, phylogenetics\",\n      \"pmids\": [\"23956223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Initially attributed substrate recognition to Rps28 binding, later revised\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revised the RPS28B model by showing Edc3 directly binds the mRNA 3'-UTR element, with Rps28b acting as a regulator of Edc3 rather than the RNA-binding bridge.\",\n      \"evidence\": \"RNA-binding assays, domain deletion, mRNA decay, co-IP in yeast\",\n      \"pmids\": [\"24492965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sequence/structural determinants of the 3'-UTR element recognition not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed the YjeF_N domain binds NADH and can chemically modify NAD, linking a metabolite-binding activity to decay control and P-body composition.\",\n      \"evidence\": \"Crystal structure, in vitro NADH binding and NAD modification, mutagenesis, functional assays\",\n      \"pmids\": [\"24504254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological substrate and product of the NAD modification unknown\", \"Whether NADH binding regulates decapping in vivo unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided a direct gene-disease link by showing a p.Phe54Ser variant that abolishes DCP2 stimulation causes intellectual disability.\",\n      \"evidence\": \"In vitro decapping with mutant EDC3 and homozygosity mapping in patients\",\n      \"pmids\": [\"25701870\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting decapping defect to neurodevelopmental phenotype unknown\", \"Single family/lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Captured the active decapping complex bound to Edc3 and product, providing direct structural proof that HLM binding stabilizes the catalytically competent DCP1-DCP2 conformation.\",\n      \"evidence\": \"Crystal structure of Dcp1-Dcp2-Edc3-m7GDP complex\",\n      \"pmids\": [\"27694841\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of the conformational switch in solution not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed how Edc3 and Edc1 coactivators act simultaneously on Dcp2, with Edc1 bridging domains and Edc3 binding the HLM, and revealed substrate nucleotide selectivity.\",\n      \"evidence\": \"Crystal structure of Edc1-Dcp1-Dcp2-Edc3 with substrate analog, kinetics\",\n      \"pmids\": [\"29559651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order and kinetics of coactivator assembly in cells unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified Pim1/Pim3 as S161 kinases and tied the EDC3 phospho-switch to prostate cancer growth and integrin mRNA regulation, extending the AKT axis to oncogenic signaling.\",\n      \"evidence\": \"Kinase assays, S161A mutagenesis, P-body microscopy, xenografts, Western/RT-PCR\",\n      \"pmids\": [\"33586867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism linking P-body exclusion to integrin mRNA stabilization not fully resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined the FDF-FEK helicase-binding mode in C. elegans EDC-3, confirming conserved but distinct DDX6-family engagement relative to Tral/Pat1 orthologs.\",\n      \"evidence\": \"Homology modeling, ITC, mutagenesis, GST pulldown, microscopy\",\n      \"pmids\": [\"34645931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental structure; single lab\", \"Functional consequences in vivo not deeply tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovered a stress-responsive Tyr-475 site that cross-talks with S161/S131 phosphorylation and remodels DDX6, DCP1, and 14-3-3 interactions while still supporting P-body formation.\",\n      \"evidence\": \"Chemical proteomics (SuTEx), mutagenesis, phosphoproteomics, co-IP, P-body rescue\",\n      \"pmids\": [\"36476517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tyr-475 kinase/writer not identified\", \"Functional output of the phospho cross-talk unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined an organismal role in embryonic mRNA clearance and granule boundary maintenance, with EDC-4 antagonism, showing EDC3 shapes condensate identity in vivo.\",\n      \"evidence\": \"C. elegans knockouts, condensate microscopy, mRNA level measurements\",\n      \"pmids\": [\"39331503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of granule boundary definition unresolved\", \"Single study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed regulated turnover of Edc3 itself via Med13-dependent cargo-hitchhiking autophagy upon nitrogen starvation, adding a degradation layer to EDC3 regulation.\",\n      \"evidence\": \"Live colocalization microscopy, genetic deletions, autophagy assays in yeast\",\n      \"pmids\": [\"39320938\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this turnover pathway is conserved in metazoans unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established functional redundancy with Scd6 in recruiting Dhh1 to Dcp2, explaining why single-mutant decay defects are mild and linking decay/translation control to nutrient availability.\",\n      \"evidence\": \"RNA-seq and ribosome profiling of single/double mutants, decay and metabolic assays in yeast\",\n      \"pmids\": [\"41289350\", \"39257769\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Selection of redundant vs unique targets not defined\", \"Conservation of redundancy in metazoans untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological function of EDC3's NAD/NADH binding and the regulatory logic integrating S161, S131, and Y475 phosphorylation with decapping activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified endogenous substrate for the YjeF_N NAD activity\", \"No structure of phosphorylated EDC3 or its 14-3-3 complex\", \"Mechanism coupling P-body exclusion to specific mRNA stabilization undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6, 13, 14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 6]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1, 5, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 6, 13, 20]}\n    ],\n    \"complexes\": [\n      \"DCP1-DCP2 decapping complex\",\n      \"P-body\"\n    ],\n    \"partners\": [\n      \"DCP2\",\n      \"DCP1\",\n      \"DDX6\",\n      \"Me31B\",\n      \"14-3-3\",\n      \"PIM1\",\n      \"PIM3\",\n      \"UPF1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}