{"gene":"EIF4EBP1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1994,"finding":"Non-phosphorylated 4E-BP1 (PHAS-I) binds directly to eIF4E and inhibits cap-dependent translation; MAP kinase phosphorylates Ser-64 of 4E-BP1, which disrupts the 4E-BP1/eIF4E interaction and relieves translational repression.","method":"In vitro binding assays, immobilized PHAS-I pulldown, mRNA cap affinity resin, in vitro phosphorylation by MAP kinase","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in vitro with multiple orthogonal methods, foundational paper","pmids":["7939721"],"is_preprint":false},{"year":1994,"finding":"4E-BP1 (PHAS-I) is a 117 amino acid heat-stable protein that is rapidly phosphorylated in response to insulin and is expressed at highest levels in fat and skeletal muscle.","method":"Molecular cloning, in vitro translation, tissue expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — original cloning and biochemical characterization","pmids":["8170978"],"is_preprint":false},{"year":1996,"finding":"Rapamycin blocks 4E-BP1 phosphorylation, activating 4E-BP1 and causing inhibition of cap-dependent (but not cap-independent) translation; the rapamycin-FKBP12 complex is the effector, and excess FK506 reverses this inhibition.","method":"In vitro translation assays, pharmacological inhibition in NIH 3T3 cells, polysome analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — functional in vitro and cell-based assays with pharmacological controls, highly cited","pmids":["8599949"],"is_preprint":false},{"year":1997,"finding":"mTOR (FRAP) directly phosphorylates 4E-BP1 (PHAS-I) on serine and threonine residues in vitro, and this phosphorylation inhibits binding of 4E-BP1 to eIF4E; mTOR is a terminal kinase in the pathway coupling mitogenic stimulation to 4E-BP1 phosphorylation.","method":"In vitro kinase assays with immunoprecipitated mTOR, cell-based phosphorylation studies with rapamycin-sensitive mTOR mutants","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro kinase assay, replicated across labs","pmids":["9204908"],"is_preprint":false},{"year":1997,"finding":"mTOR regulates 4E-BP1 and p70 S6 kinase in a parallel (not sequential) manner; rapamycin-resistant mTOR mutants protect both 4E-BP1 and S6K from rapamycin-induced dephosphorylation, and this protection requires an active mTOR catalytic domain.","method":"Expression of rapamycin-resistant mTOR mutants, in situ phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — epistasis via rapamycin-resistant mutants, multiple controls","pmids":["9334222"],"is_preprint":false},{"year":1997,"finding":"In rat adipocytes, insulin stimulates phosphorylation of 4E-BP1 at Thr36, Thr45, Ser64, Thr69, and Ser82 (all Ser/Thr-Pro motifs), and all five sites are decreased by rapamycin; phosphorylation of Thr36 alone is insufficient for dissociation of the 4E-BP1/eIF4E complex.","method":"Phosphopeptide mapping by reverse-phase HPLC and Edman degradation, in vitro MAP kinase phosphorylation, cell-based studies with rapamycin","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct phosphosite identification by sequencing, site-specific mutagenesis functional analysis","pmids":["9092573"],"is_preprint":false},{"year":1997,"finding":"Heat shock causes dephosphorylation of 4E-BP1 in H35 hepatoma cells and other cell lines, which is accompanied by increased eIF4E binding to 4E-BP1 and inhibition of translation; this dephosphorylation is reversed by the phosphatase inhibitor okadaic acid.","method":"Phosphorylation analysis by gel shift, eIF4E pulldown, phosphatase inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — cell-based assay with phosphatase inhibitor mechanistic follow-up","pmids":["9341116"],"is_preprint":false},{"year":1998,"finding":"4E-BP1 is completely disordered in its free state (no regions of local order detectable by NMR), indicating that its binding to eIF4E is an induced-fit interaction with a completely disordered protein.","method":"NMR spectroscopy (double and triple resonance, steady-state NOEs)","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 — NMR structural characterization","pmids":["9684899"],"is_preprint":false},{"year":1999,"finding":"mTOR/FRAP phosphorylates 4E-BP1 on Thr-37 and Thr-46 in vitro (even when 4E-BP1 is bound to eIF4E), and these phosphorylations serve as a priming event required for subsequent phosphorylation of carboxy-terminal serum-sensitive sites; loss of these priming sites prevents downstream multi-site phosphorylation.","method":"In vitro kinase assays with recombinant FRAP, phosphopeptide mapping, mass spectrometry, site-directed mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro kinase assay combined with MS phosphosite identification and mutagenesis, highly cited","pmids":["10364159"],"is_preprint":false},{"year":1999,"finding":"4E-BP1 exists as 8-10 phosphorylation isoforms resolvable by 2D gel electrophoresis; heat shock induces rapid dephosphorylation of 4E-BP1 concurrent with translation inhibition, and phosphatase inhibitor okadaic acid restores phosphorylation during heat shock.","method":"2D IEF/SDS-PAGE immunoblotting, [32P] metabolic labeling, okadaic acid treatment","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple isoforms identified by 2D gel, phosphatase inhibitor confirms phosphatase-dependent dephosphorylation","pmids":["10504405"],"is_preprint":false},{"year":2000,"finding":"mTOR directly phosphorylates 4E-BP1 at Thr-36/45 and (with an activating antibody) at Thr-69 and Ser-64 in vitro; phosphorylation of Thr-36/45 by mTOR facilitates subsequent Thr-69 and Ser-64 phosphorylation in an ordered hierarchy; phosphorylation of Ser-64 is most rapamycin-sensitive.","method":"In vitro kinase assay with immunoprecipitated mTOR, phospho-specific antibodies, rapamycin-FKBP12 inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with phospho-specific antibodies confirming ordered phosphorylation","pmids":["10942774"],"is_preprint":false},{"year":2000,"finding":"Cap-dependent binding of 4E-BP1 to eIF4E is enhanced ~100-fold in the presence of m7GTP; phosphorylation of 4E-BP1 weakens interaction with eIF4E regardless of cap status, and pre-formed 4E-BP1/eIF4E complexes are not dissociated by phosphorylation, suggesting regulation occurs at the free 4E-BP1 state.","method":"Surface plasmon resonance binding analysis","journal":"IUBMB life","confidence":"Medium","confidence_rationale":"Tier 1 — direct biophysical binding assay with defined conditions","pmids":["10772338"],"is_preprint":false},{"year":2001,"finding":"4E-BP1 knockout mice have markedly smaller white fat pads; knockout males display increased metabolic rate and white adipose tissue containing multilocular brown-adipocyte-like cells expressing UCP1; translation of PGC-1α is increased in white adipose tissue of knockout mice, demonstrating 4E-BP1 as a regulator of adipogenesis and metabolism.","method":"Gene knockout in mice (Eif4ebp1-/-), histology, metabolic rate measurement, Western blotting, polysome analysis","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined metabolic phenotype and molecular mechanism (PGC-1α translation)","pmids":["11590436"],"is_preprint":false},{"year":2001,"finding":"During liver regeneration after partial hepatectomy in rats, 4E-BP1 phosphorylation is induced in a rapamycin-insensitive manner, demonstrating that mTOR-independent kinases can phosphorylate 4E-BP1 in vivo.","method":"Partial hepatectomy rat model, phospho-specific antibodies, rapamycin treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo model with specific phospho-antibodies and pharmacological controls","pmids":["11278364"],"is_preprint":false},{"year":2002,"finding":"Phosphorylation events govern the proapoptotic potency of 4E-BP1; phosphorylation site mutants of 4E-BP1 that more strongly repress cap-dependent translation are more potently proapoptotic; at maximum translational repression, cap-independent (IRES-dependent) translation is activated, reducing apoptosis.","method":"Expression of phosphorylation site mutants, cap-dependent vs. IRES-dependent translation reporters, apoptosis assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — systematic mutagenesis with dual-luciferase reporters and apoptosis readouts","pmids":["11909977"],"is_preprint":false},{"year":2003,"finding":"Both the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 are required for efficient in vitro phosphorylation by mTOR and for binding to Raptor; raptor overexpression enhances phosphorylation of wild-type but not motif-mutant 4E-BP1, indicating Raptor serves as a docking scaffold for 4E-BP1 phosphorylation by mTOR.","method":"In vitro mTOR kinase assay with recombinant PHAS-I mutants, co-immunoprecipitation with HA-tagged raptor, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted in vitro kinase assay with mutagenesis and co-IP","pmids":["12665511"],"is_preprint":false},{"year":2003,"finding":"A functional TOS motif in 4E-BP1 is required for binding to Raptor, for efficient in vitro phosphorylation by mTOR/Raptor complex, and for phosphorylation at all mTOR-regulated sites in vivo; TOS motif mutation (F114A) causes reduced cell size, demonstrating TOS-dependent mTOR/Raptor-mediated regulation of cell growth.","method":"Co-immunoprecipitation, in vitro mTOR/raptor kinase assay, site-directed mutagenesis, cell size measurement","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution, reciprocal Co-IP, mutagenesis, cellular phenotype","pmids":["12747827"],"is_preprint":false},{"year":2003,"finding":"Ser-64 and Ser-111 are not required for insulin-stimulated dissociation of 4E-BP1 from eIF4E; Thr-36/45 phosphorylation is implicated as the primary determinant of 4E-BP1/eIF4E dissociation.","method":"Mutagenesis (Ala-64 and Ala-111 mutants), in situ phosphorylation analysis, eIF4E binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with binding functional readout","pmids":["14507920"],"is_preprint":false},{"year":2004,"finding":"4E-BP1 binds to the eIF4E homologous protein 4EHP via its canonical eIF4E-binding motif (Y54 and L59 required); 4EHP overexpression creates a negative feedback loop inhibiting upstream signaling to 4E-BP1 and S6K1, and this feedback requires the 4E-BP1-binding capability of 4EHP.","method":"Co-immunoprecipitation, site-directed mutagenesis of 4E-BP1 and 4EHP binding interfaces","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with mutagenesis of both binding partners, single lab","pmids":["15094042"],"is_preprint":false},{"year":2008,"finding":"SR protein SF2/ASF promotes translation initiation of bound mRNAs by suppressing 4E-BP1 activity; SF2/ASF interacts with both mTOR and the phosphatase PP2A to regulate 4E-BP1 phosphorylation, functioning as an adaptor to recruit translation regulatory molecules to specific mRNAs.","method":"Co-immunoprecipitation, translation reporter assays, mTOR/PP2A interaction studies","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with mTOR and PP2A, translation reporter functional validation","pmids":["18439897"],"is_preprint":false},{"year":2008,"finding":"ATF4 directly transcriptionally induces 4E-BP1 expression under ER stress; elevated 4E-BP1 in pancreatic beta cells under ER stress is required for cell survival; Eif4ebp1 deletion increases susceptibility to ER stress-mediated apoptosis and accelerates beta cell loss in diabetic mouse models.","method":"Chromatin IP, 4E-BP1 promoter-reporter assay, Eif4ebp1 knockout mouse, MIN6 beta cell knockdown, diabetic mouse models","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — ChIP demonstrating direct transcription factor binding, gene KO with clear phenotype","pmids":["18316032"],"is_preprint":false},{"year":2002,"finding":"UVB irradiation induces 4E-BP1 phosphorylation at Thr-36, Thr-45, Ser-64, and Thr-69 via the p38/MSK1 pathway (not PI3K/Akt); dominant-negative p38 and MSK1 block UVB-induced 4E-BP1 phosphorylation and eIF4E release.","method":"Dominant-negative kinase expression, pharmacological inhibitors (p38 inhibitors, wortmannin, H89), in vivo phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — dominant-negative mutants combined with inhibitors, multiple phosphosites confirmed","pmids":["11777913"],"is_preprint":false},{"year":2009,"finding":"4E-BP1 is a transcriptional target of Smad4; TGFβ-stimulated Smad4 enhances 4E-BP1 gene-promoter activity through a conserved Smad-binding element; 4E-BP1 is required for TGFβ-mediated antiproliferative effects.","method":"Smad4 ChIP, 4E-BP1 promoter-reporter assay, siRNA knockdown, 4E-BP1 knockout MEFs, Smad4+/+ vs Smad4-/- cell lines","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP confirming direct promoter binding, KO MEFs with functional readout","pmids":["19834456"],"is_preprint":false},{"year":2010,"finding":"mTORC1 ablation in mouse myocardium causes fatal dilated cardiomyopathy with 4E-BP1 accumulation; simultaneous ablation of 4E-BP1 together with mTOR markedly improves cardiac apoptosis, heart function, and survival, demonstrating that 4E-BP1 mediates the deleterious effects of reduced mTOR activity in the heart.","method":"Cardiac-specific Mtor knockout mouse, double knockout of Mtor and Eif4ebp1, histology, echocardiography, survival analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — clean conditional double-KO with defined cardiac phenotype","pmids":["20644257"],"is_preprint":false},{"year":2010,"finding":"Non-phosphorylated 4E-BP1 interacts with p21 protein and induces its proteasomal degradation; mTORC1 activation phosphorylates 4E-BP1, preventing this p21-destabilizing interaction and thereby stabilizing p21 protein in HNSCC cells.","method":"Co-immunoprecipitation, Western blotting with phospho-4E-BP1 mutants, siRNA knockdown","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP finding, replicated with phospho-mutants","pmids":["26832959"],"is_preprint":false},{"year":2010,"finding":"4E-BP1 and ERK pathways converge to regulate cap-dependent translation via 4E-BP1; both AKT and ERK pathways independently regulate 4E-BP1 phosphorylation, and their combined inhibition is required to fully suppress translation in tumors with co-activation of both pathways; knockdown of 4E-BP1 reduces dependence on AKT/ERK signaling.","method":"siRNA knockdown, dominant-active 4E-BP1 mutant, inhibitor combinations, polysome profiling","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches including genetic manipulation and pharmacology","pmids":["20609351"],"is_preprint":false},{"year":2010,"finding":"The disorder-to-order transition of 4E-BP1 is required for tight eIF4E binding; phosphorylation of S65 destabilizes the α-helical conformation of the 4E-BP1 binding motif, biasing the free energy landscape toward the unfolded state that cannot bind eIF4E.","method":"Isothermal calorimetry, circular dichroism, NMR, computational modeling","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — multiple biophysical methods combined with computational modeling","pmids":["20880835"],"is_preprint":false},{"year":2011,"finding":"MCV small T antigen acts downstream of mTORC1 to maintain 4E-BP1 hyperphosphorylation and dysregulated cap-dependent translation; MCV sT-induced hyperphosphorylation of 4E-BP1 Ser65 is resistant to mTORC1/mTORC2 inhibitors; constitutively active non-phosphorylatable 4E-BP1 antagonizes MCV sT transformation.","method":"Dominant-active 4E-BP1 mutant expression, mTORC1/2 inhibitor treatment, cell transformation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — rescue experiment with non-phosphorylatable 4E-BP1 mutant, pharmacological dissection","pmids":["21841310"],"is_preprint":false},{"year":2012,"finding":"4E-BP1 co-localizes with PLK1 at centrosomes during mitosis; 4E-BP1 interacts directly with PLK1 in vitro and in vivo via its C-terminal aa 77-118; PLK1 phosphorylates 4E-BP1 in vitro; 4E-BP1 depletion causes polyploidy, chromosomal misalignment, multi-polar spindles, and sensitizes cells to paclitaxel.","method":"Co-immunoprecipitation, in vitro kinase assay with PLK1, siRNA knockdown, immunofluorescence co-localization","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vitro kinase assay and Co-IP with cellular phenotype, single lab","pmids":["22918237"],"is_preprint":false},{"year":2012,"finding":"Phosphorylation at Thr46 alone (rapamycin-insensitive) is sufficient to prevent eIF4E:4E-BP1 binding, establishing that the initial rapamycin-insensitive mTORC1 phosphorylation at Thr46 directly regulates the 4E-BP1/eIF4E interaction.","method":"Site-directed mutagenesis of 4E-BP1, eIF4E co-immunoprecipitation, rapamycin and mTOR kinase inhibitor treatment","journal":"F1000Research","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with functional binding assay, single lab","pmids":["24358826"],"is_preprint":false},{"year":2013,"finding":"mTOR/4E-BP1 signaling in the suprachiasmatic nucleus (SCN) is rhythmically regulated; 4E-BP1 preferentially represses VIP mRNA translation; Eif4ebp1 knockout mice display accelerated re-entrainment to shifted light/dark cycles and are more resistant to constant light-induced rhythm disruption; Mtor+/- mice show decreased VIP expression and increased susceptibility to constant light.","method":"Eif4ebp1 knockout mouse, Mtor heterozygous mouse, VIP immunoassay, circadian behavior analysis, mTOR inhibitor treatment","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and heterozygous models with defined molecular and behavioral phenotypes","pmids":["23972597"],"is_preprint":false},{"year":2013,"finding":"O-GlcNAcylation of 4E-BP1 in hyperglycemic conditions enhances its interaction with eIF4E and causes a shift from cap-dependent to cap-independent mRNA translation; this glucose-induced translational shift does not occur in 4E-BP1-deficient cells.","method":"4E-BP1 knockout cells, bicistronic luciferase reporter assay, pulsed SILAC proteomics, phlorizin treatment of STZ-diabetic mice","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — 4E-BP1 KO rescue experiment with translation reporters, in vivo confirmation","pmids":["23434932"],"is_preprint":false},{"year":2013,"finding":"Phosphorylated EIF4EBP1 localizes to the spindle apparatus in mouse oocytes during meiosis in a phosphorylation-site-specific manner: Ser65-phosphorylated 4E-BP1 localizes at spindle poles, Thr70-phosphorylated 4E-BP1 localizes on the spindle; CDK1 and mTOR are the main positive regulators after nuclear envelope breakdown; expression of dominant-negative 4E-BP1 causes spindle abnormality.","method":"Immunofluorescence, Western blotting, CDK1 and mTOR inhibitors, dominant-negative 4E-BP1 expression, mouse oocyte maturation model","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — immunofluorescence localization with kinase inhibitor dissection and dominant-negative functional readout","pmids":["23852387"],"is_preprint":false},{"year":2015,"finding":"The 2.1-Å crystal structure of mouse eIF4E complexed with m7GTP and a 4E-BP1 fragment (residues 50-84) reveals two binding motifs: the canonical YXXXXLΦ motif and a proline-turn-helix extension containing S65 and T70 phosphorylation sites; a C-terminal motif (motif 3) is critical for 4E-BP1-mediated cell cycle arrest and partially overlaps with the 4EGI-1 binding site.","method":"X-ray crystallography at 2.1 Å, cell cycle arrest assays with 4E-BP1 truncation mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional validation","pmids":["26170285"],"is_preprint":false},{"year":2015,"finding":"Enhanced 4E-BP1 activity in mouse skeletal muscle protects against age- and diet-induced insulin resistance and metabolic decline; 4E-BP1-mediated metabolic protection occurs through increased translation of PGC-1α and enhanced mitochondrial respiratory function; skeletal muscle 4E-BP1 also promotes FGF21 secretion preserving brown adipose tissue.","method":"Muscle-specific 4E-BP1 transgenic mice, metabolic rate measurements, polysome/translation assays, adipose tissue phenotyping","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — tissue-specific transgenic with multiple mechanistic readouts","pmids":["26121750"],"is_preprint":false},{"year":2017,"finding":"Snail transcriptionally represses 4E-BP1 by binding to three E-boxes in the human 4E-BP1 promoter; Snail overexpression promotes cap-dependent translation and reduces sensitivity to mTOR kinase inhibitors; pharmacological inhibition of Snail restores 4E-BP1 expression and sensitizes cancer cells to mTOR inhibitors.","method":"Chromatin IP, promoter-reporter assay, Snail overexpression and knockdown, polysome profiling, tumor xenograft","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — ChIP confirming direct promoter binding, genetic and pharmacological validation","pmids":["29263324"],"is_preprint":false},{"year":2017,"finding":"In mouse oocytes, 4E-BP1 undergoes meiosis-resumption-dependent phosphorylation by CDK1 and mTOR (but not PLK1); CDK1 promotes 4E-BP1 phosphorylation via phosphorylation and activation of mTOR; dominant-negative 4E-BP1 impairs translation and causes spindle abnormalities; this mTOR regulatory pathway is also present in human oocytes.","method":"Immunofluorescence in mouse/human oocytes, CDK1/PLK1/mTOR inhibitors, dominant-negative 4E-BP1 expression, cumulus cell comparison","journal":"Cell cycle","confidence":"High","confidence_rationale":"Tier 2 — pharmacological epistasis plus dominant-negative functional readout in oocytes","pmids":["28272965"],"is_preprint":false},{"year":2018,"finding":"lncRNA H19 directly interacts with 4E-BP1 at its TOS motif and competitively inhibits 4E-BP1 binding to Raptor, thereby blocking mTORC1-mediated 4E-BP1 phosphorylation without affecting S6K1 activation.","method":"RNA immunoprecipitation, co-immunoprecipitation of H19/4E-BP1/Raptor, TOS motif competition assay, 4E-BP1 phosphorylation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — RNA-IP and protein Co-IP with competition mechanism, mechanistically defined","pmids":["30397197"],"is_preprint":false},{"year":2019,"finding":"CDK12 phosphorylates 4E-BP1 at S65 and T70 (Ser-Pro sites); prior mTORC1 phosphorylation at T37/T46 facilitates CDK12 phosphorylation; CDK12-dependent 4E-BP1 phosphorylation controls exchange of 4E-BP1 with eIF4G at the 5' cap of CHK1 and other target mRNAs; CDK12 depletion causes chromosome misalignment and segregation defects.","method":"In vitro CDK12 kinase assay, RIP-seq, Ribo-seq, confocal imaging, mutagenesis of phosphorylation sites","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay combined with genome-wide ribosome profiling and RIP-seq","pmids":["30819820"],"is_preprint":false},{"year":2019,"finding":"rapamycin-insensitive mTORC1 signaling via 4E-BP1 (not canonical PI3K/Akt) is a critical pathway for TGF-β1-stimulated collagen synthesis in human lung fibroblasts; CRISPR-Cas9 deletion of 4E-BP1 confirms its essential role in fibrogenesis.","method":"CRISPR-Cas9 gene editing, mTOR inhibitors, collagen synthesis assays, precision-cut lung slices","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO in multiple cell types with mechanistic pathway dissection","pmids":["30602778"],"is_preprint":false},{"year":2019,"finding":"In HNSCC, mTOR persistently restrains 4E-BP1 via phosphorylation; CRISPR/Cas9 deletion of 4E-BP1 reduces sensitivity to mTOR inhibitors both in vitro and in vivo; conditional expression of phosphorylation-resistant 4E-BP1 disrupts the translation initiation complex and prevents tumor growth.","method":"CRISPR-Cas9 4E-BP1 deletion, conditional phosphorylation-resistant 4E-BP1 expression, 4e-bp1/2 knockout mouse carcinogenesis models, tumor xenograft","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO and conditional expression with in vivo tumor phenotype","pmids":["30894372"],"is_preprint":false},{"year":2019,"finding":"O-GlcNAcylation of 4E-BP1 stabilizes it by slowing degradation via its PEST motif; a CUL3-containing E3 ubiquitin ligase complex binds the PEST motif to mediate 4E-BP1 polyubiquitination and turnover; O-GlcNAcylation of the PEST motif prevents this ubiquitination, increasing 4E-BP1 protein levels in diabetic retinas.","method":"PEST motif mutagenesis, CUL3 co-immunoprecipitation, ubiquitination assays, O-GlcNAcase inhibitor treatment, pulse-chase degradation assay","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis, Co-IP of E3 ligase, and ubiquitination assay with functional degradation readout","pmids":["26998719"],"is_preprint":false},{"year":2021,"finding":"By NMR spectroscopy, the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 bind to separate sites on Raptor, creating avidity-based tethering; this dual tethering orients the flexible central region toward the mTORC1 kinase site; phosphorylation-induced conformational switching of 4E-BP1 explains the hierarchy of phosphorylation; mTORC1 recognizes both free and eIF4E-bound 4E-BP1.","method":"NMR spectroscopy of 4E-BP1 interaction with Raptor, mutagenesis, in vitro mTORC1 kinase assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution NMR with biochemical validation, explains hierarchy of phosphorylation","pmids":["33852892"],"is_preprint":false},{"year":2008,"finding":"p53 activation leads to proteasome-mediated truncation of 4E-BP1, producing a stable, hypophosphorylated, truncated form that binds eIF4E preferentially over full-length 4E-BP1, contributing to long-term inhibition of cap-dependent translation.","method":"Proteasome inhibitor treatment, co-immunoprecipitation, pulse-chase turnover assay, p53 activation","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2-3 — pharmacological dissection with binding and turnover assays, single lab","pmids":["18021075"],"is_preprint":false},{"year":2009,"finding":"RhoE inhibits 4E-BP1 phosphorylation independently of mTOR (as S6K phosphorylation and mTOR/Raptor dynamics are unaffected), preventing eIF4E release from 4E-BP1 and inhibiting cap-dependent translation; eIF4E overexpression rescues both cell cycle progression and Ras-induced transformation in RhoE-expressing cells.","method":"RhoE overexpression, pharmacological comparisons with rapamycin, eIF4E rescue, translation reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mTOR-independence established by S6K controls, eIF4E rescue confirms mechanism","pmids":["19850923"],"is_preprint":false},{"year":2015,"finding":"PP2A-mediated dephosphorylation of 4E-BP1 is the dominant mechanism controlling 4E-BP1 phosphorylation status in the retina in response to inhibition of glycolysis; glycolytic inhibition dephosphorylates 4E-BP1 independently of mTORC1 through phosphatase activation.","method":"Ex vivo rat retina preparations, phosphatase inhibitors (okadaic acid, calyculin A, cadmium), 2-deoxyglucose, mTORC1 activity assays","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological dissection distinguishing mTORC1-independent phosphatase mechanism","pmids":["26199279"],"is_preprint":false},{"year":2019,"finding":"4E-BP1 loss in pancreatic cancer cells leads to selective upregulation of translation of mRNAs encoding DNA replication/repair proteins (including RRM2 and CDC6), making DNA replication insensitive to mTOR inhibitors; this effect is confirmed in 4E-BP1/2-deleted mice showing increased acinar proliferation after pancreatitis.","method":"Genome-wide polysome profiling, 4E-BP1 depletion, 4E-BP1/2 double-knockout mouse, eIF4A inhibitor treatment","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ribosome profiling with genetic KO validation","pmids":["31672935"],"is_preprint":false},{"year":2023,"finding":"4E-BP1 stabilizes mitochondrial respiration complex III proteins (including UQCRC2) at the translational level; 4E-BP1 deficiency in human MSCs destabilizes complex III subunits, increases mitochondrial ROS, and accelerates cellular senescence; ectopic 4E-BP1 expression rescues these mitochondrial defects.","method":"4E-BP1 gene inactivation by CRISPR in hMSCs, ectopic expression rescue, Western blotting of respiratory complex subunits, mitochondrial respiration assays, ROS measurement","journal":"Protein & cell","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO with rescue experiment and mitochondrial functional readout","pmids":["36929036"],"is_preprint":false}],"current_model":"EIF4EBP1/4E-BP1 is an intrinsically disordered translational repressor that, in its hypophosphorylated state, binds eIF4E to block cap-dependent translation initiation; mTORC1 phosphorylates 4E-BP1 hierarchically—first at Thr37/46 (priming, rapamycin-insensitive, mediated by dual RAIP/TOS-motif tethering to Raptor) and then at Thr70/Ser65 (the latter facilitated by CDK12)—inducing a disorder-to-order conformational switch that releases eIF4E for assembly of the eIF4F translation initiation complex; additional kinases (MAP kinase, p38/MSK1, CDK1, PLK1) and phosphatases (PP2A) also regulate 4E-BP1 phosphorylation in specific contexts; 4E-BP1 expression is transcriptionally controlled by Smad4/TGFβ, PI3K (repressive), ATF4 (ER stress), and Snail (repressive), and post-translationally regulated by O-GlcNAcylation-dependent stabilization and CUL3-mediated proteasomal degradation; beyond translational control, 4E-BP1 interacts with PLK1 at centrosomes to maintain mitotic spindle integrity, interacts with p21 to regulate its stability, and plays essential roles in adipogenesis, cardiac function, circadian entrainment, oocyte meiosis, mitochondrial homeostasis, and stem cell senescence."},"narrative":{"teleology":[{"year":1994,"claim":"Identification of 4E-BP1 as a direct eIF4E-binding protein whose phosphorylation by MAP kinase disrupts this interaction established the paradigm that cap-dependent translation is regulated by a phosphorylation-sensitive repressor.","evidence":"In vitro binding assays with immobilized PHAS-I and cap-affinity chromatography; molecular cloning revealing a 117-aa heat-stable, insulin-responsive protein","pmids":["7939721","8170978"],"confidence":"High","gaps":["Identity of the physiological kinase in cells was unclear","Phosphorylation sites not yet mapped comprehensively","Mechanism by which phosphorylation disrupts binding was unknown"]},{"year":1997,"claim":"Demonstration that mTOR directly phosphorylates 4E-BP1 and that rapamycin blocks this phosphorylation placed 4E-BP1 as a direct mTOR substrate and explained rapamycin's translational effects.","evidence":"In vitro kinase assays with immunoprecipitated mTOR; rapamycin-resistant mTOR mutants protecting 4E-BP1 phosphorylation; phosphopeptide mapping identifying five Ser/Thr-Pro sites in rat adipocytes","pmids":["9204908","9334222","9092573","8599949"],"confidence":"High","gaps":["Ordered hierarchy of phosphorylation events not yet resolved","Role of individual sites in eIF4E release unclear","Heat-shock-induced dephosphorylation mechanism (phosphatase identity) undefined"]},{"year":1999,"claim":"Reconstitution of mTOR-mediated phosphorylation revealed that Thr37/46 are priming sites whose modification is required for subsequent phosphorylation at C-terminal sites, establishing the hierarchical phosphorylation model.","evidence":"In vitro FRAP kinase assay with recombinant 4E-BP1, mass spectrometry phosphosite identification, site-directed mutagenesis showing loss of downstream phosphorylation upon Thr37/46 mutation","pmids":["10364159"],"confidence":"High","gaps":["Structural basis for how priming enables downstream phosphorylation unknown","Whether hierarchy operates identically in vivo across tissues untested"]},{"year":2000,"claim":"Biophysical and kinase studies refined the ordered phosphorylation model and showed that phosphorylation weakens eIF4E binding regardless of cap status, but cannot dissociate preformed complexes, implying regulation occurs at the level of free 4E-BP1.","evidence":"Surface plasmon resonance quantifying ~100-fold cap-enhanced binding; in vitro mTOR kinase assay with activating antibody confirming Ser64 as most rapamycin-sensitive site","pmids":["10942774","10772338"],"confidence":"High","gaps":["Structural mechanism of phosphorylation-induced conformational change unresolved","In vivo dynamics of complex formation/dissociation not measured"]},{"year":2001,"claim":"4E-BP1 knockout mice revealed unexpected metabolic functions—reduced white adipose tissue with browning and increased PGC-1α translation—demonstrating that 4E-BP1's translational repression has systemic physiological consequences beyond cell-autonomous growth control.","evidence":"Eif4ebp1−/− mice with histology, metabolic rate measurement, and polysome analysis in white adipose tissue","pmids":["11590436"],"confidence":"High","gaps":["Contribution of 4E-BP2/3 compensation unclear","Tissue-specific mRNA targets beyond PGC-1α not identified","Mechanism linking translational changes to adipocyte fate unknown"]},{"year":2002,"claim":"Discovery that p38/MSK1 phosphorylates 4E-BP1 upon UVB irradiation independently of PI3K/Akt, and that non-phosphorylatable 4E-BP1 is proapoptotic through maximal cap-dependent translational repression, revealed mTOR-independent regulation and linked 4E-BP1 to apoptosis.","evidence":"Dominant-negative p38/MSK1 blocking UVB-induced phosphorylation; systematic phosphorylation-site mutants with apoptosis and dual-luciferase translation reporters","pmids":["11777913","11909977"],"confidence":"High","gaps":["Whether MSK1 directly phosphorylates 4E-BP1 or acts through intermediary not definitively resolved","Apoptotic target mRNAs not identified"]},{"year":2003,"claim":"Identification of the RAIP and TOS motifs as dual Raptor-binding elements explained how mTORC1 selectively recognizes 4E-BP1 and established Raptor as a scaffold essential for efficient substrate phosphorylation.","evidence":"In vitro mTOR kinase assays with RAIP/TOS motif mutants, Raptor co-immunoprecipitation, cell size measurements upon TOS mutation","pmids":["12665511","12747827"],"confidence":"High","gaps":["Structural basis for dual-motif recognition unknown","Relative contribution of each motif to phosphorylation hierarchy unresolved"]},{"year":2008,"claim":"ATF4-dependent transcriptional induction of 4E-BP1 under ER stress, and the finding that SF2/ASF orchestrates mTOR and PP2A to regulate 4E-BP1 phosphorylation on specific mRNAs, demonstrated that 4E-BP1 is regulated at both transcriptional and phosphatase levels to tune translation in stress contexts.","evidence":"ChIP confirming ATF4 binding to the 4E-BP1 promoter; Eif4ebp1−/− beta cells showing ER stress sensitivity; SF2/ASF co-IP with mTOR and PP2A","pmids":["18316032","18439897"],"confidence":"High","gaps":["Full spectrum of 4E-BP1 transcriptional regulators undefined","PP2A regulatory subunit specificity for 4E-BP1 not identified"]},{"year":2010,"claim":"Cardiac-specific mTOR ablation causing lethal cardiomyopathy rescued by 4E-BP1 co-deletion, convergence of AKT and ERK pathways on 4E-BP1 phosphorylation in tumors, and biophysical demonstration that Ser65 phosphorylation destabilizes the α-helical binding conformation collectively established 4E-BP1 as a critical integration node whose conformational switch determines cell fate outcomes.","evidence":"Conditional cardiac mTOR/4E-BP1 double KO with echocardiography and survival; siRNA/inhibitor combinations with polysome profiling in cancer cells; ITC, CD, NMR, and computational modeling of phosphorylation-induced disorder","pmids":["20644257","20609351","20880835"],"confidence":"High","gaps":["In vivo structural dynamics of phosphorylation-induced release from eIF4E not captured","Whether ERK directly or indirectly phosphorylates 4E-BP1 unresolved"]},{"year":2012,"claim":"PLK1 was identified as a mitotic kinase that directly phosphorylates and interacts with 4E-BP1 at centrosomes, linking 4E-BP1 to spindle integrity beyond its role in translation—a first indication of a non-canonical function.","evidence":"Co-immunoprecipitation and immunofluorescence co-localization with PLK1; in vitro PLK1 kinase assay; 4E-BP1 depletion causing multipolar spindles and polyploidy","pmids":["22918237"],"confidence":"Medium","gaps":["PLK1-specific phosphosites on 4E-BP1 not mapped","Whether the spindle function is translation-dependent or translation-independent not established","Single-lab finding not independently confirmed"]},{"year":2013,"claim":"4E-BP1 was shown to preferentially repress VIP translation in the SCN to regulate circadian re-entrainment, and O-GlcNAcylation was discovered to enhance eIF4E binding and shift translation mode under hyperglycemia, expanding both the physiological and post-translational regulatory dimensions of 4E-BP1.","evidence":"Eif4ebp1−/− mice with circadian behavioral analysis and VIP immunoassay; KO cells with bicistronic reporters and SILAC proteomics under high glucose","pmids":["23972597","23434932"],"confidence":"High","gaps":["Mechanism of mRNA-selective repression (VIP vs. other SCN transcripts) not defined","O-GlcNAcylation sites on 4E-BP1 not fully mapped"]},{"year":2015,"claim":"The 2.1-Å crystal structure of the eIF4E–4E-BP1 complex revealed a bipartite binding interface including a secondary helix containing Ser65/Thr70, providing the first atomic explanation of how phosphorylation at these sites would sterically and conformationally disrupt binding; enhanced 4E-BP1 in skeletal muscle was shown to protect against metabolic decline via PGC-1α and FGF21.","evidence":"X-ray crystallography with functional validation by truncation mutants and cell cycle assays; muscle-specific 4E-BP1 transgenic mice with metabolic, translation, and adipose phenotyping","pmids":["26170285","26121750"],"confidence":"High","gaps":["Full-length 4E-BP1 structure in complex with eIF4E lacking","How FGF21 secretion is translationally controlled by 4E-BP1 unclear"]},{"year":2017,"claim":"Snail was identified as a transcriptional repressor of 4E-BP1 via E-box elements, providing a mechanism by which EMT programs bypass mTOR-targeted therapy; CDK1 and mTOR (but not PLK1) were confirmed as the dominant kinases for 4E-BP1 during oocyte meiotic resumption.","evidence":"ChIP of Snail on 4E-BP1 promoter, polysome profiling, xenograft sensitivity; pharmacological epistasis in mouse and human oocytes with dominant-negative 4E-BP1","pmids":["29263324","28272965"],"confidence":"High","gaps":["Whether Snail-mediated 4E-BP1 repression operates outside cancer contexts unknown","Direct CDK1 phosphosites on 4E-BP1 during meiosis not mapped"]},{"year":2018,"claim":"The lncRNA H19 was found to bind the TOS motif of 4E-BP1 and competitively inhibit Raptor interaction, revealing an RNA-based mechanism that selectively modulates 4E-BP1 phosphorylation without affecting S6K1.","evidence":"RNA immunoprecipitation, protein co-IP demonstrating competition between H19 and Raptor for TOS motif binding","pmids":["30397197"],"confidence":"High","gaps":["Whether other lncRNAs similarly regulate 4E-BP1 unknown","Physiological contexts where H19-mediated regulation is dominant not established"]},{"year":2019,"claim":"CDK12 was identified as a kinase phosphorylating 4E-BP1 at Ser65/Thr70 after mTORC1 priming, controlling the translational switch from 4E-BP1 to eIF4G on CHK1 and other target mRNAs; O-GlcNAcylation was shown to stabilize 4E-BP1 by blocking CUL3-mediated PEST-motif ubiquitination; genome-wide profiling revealed 4E-BP1-dependent selective translation of DNA replication/repair mRNAs.","evidence":"In vitro CDK12 kinase assay with RIP-seq and Ribo-seq; PEST mutagenesis with CUL3 co-IP and ubiquitination assays; polysome profiling in 4E-BP1-depleted pancreatic cancer cells and KO mice","pmids":["30819820","26998719","31672935"],"confidence":"High","gaps":["CDK12 substrate specificity relative to other CDKs on 4E-BP1 not fully resolved","Full set of 4E-BP1-sensitive mRNAs across tissues not catalogued","CUL3 adaptor subunit mediating 4E-BP1 recognition not identified"]},{"year":2021,"claim":"NMR-resolved mapping of the 4E-BP1–Raptor interface showed that RAIP and TOS motifs bind separate Raptor surfaces, creating avidity-based tethering that orients the flexible central domain toward the mTORC1 active site, providing the structural explanation for hierarchical phosphorylation.","evidence":"NMR spectroscopy of 4E-BP1 interaction with Raptor, mutagenesis, and in vitro mTORC1 kinase assays","pmids":["33852892"],"confidence":"High","gaps":["Cryo-EM structure of the full mTORC1–4E-BP1 complex not yet available","How phosphorylation at Thr37/46 repositions the substrate for subsequent kinase events at atomic resolution unresolved"]},{"year":2023,"claim":"4E-BP1 was shown to sustain mitochondrial complex III integrity by promoting translation of UQCRC2 and related subunits; its loss in human MSCs elevated ROS and accelerated senescence, rescued by ectopic 4E-BP1 expression.","evidence":"CRISPR KO in hMSCs with ectopic rescue, mitochondrial respiration assays, complex III subunit quantification","pmids":["36929036"],"confidence":"High","gaps":["Whether 4E-BP1 directly binds mitochondrial mRNAs or acts through general cap-dependent control of nuclear-encoded subunits is unresolved","Relevance to in vivo aging not tested"]},{"year":null,"claim":"Key unresolved questions include the full structural basis of the mTORC1–4E-BP1 complex at atomic resolution, the complete inventory of 4E-BP1-sensitive mRNAs across tissues, the identity of the CUL3 adaptor for 4E-BP1 ubiquitination, and whether the centrosomal/spindle functions of 4E-BP1 are translation-independent.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution cryo-EM structure of mTORC1 engaged with full-length 4E-BP1","Translation-independent spindle role not mechanistically separated from local translation","Tissue-specific 4E-BP1-regulated translatomes largely unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,14,26,33]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,11,33,42]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,7,11]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[28,32]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[28,32]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,3,8,26,38]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,15,16,25,37,42]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[28,32,36,38]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[14,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[12,34,47]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2,14,31]}],"complexes":["eIF4E–4E-BP1 inhibitory complex"],"partners":["EIF4E","MTOR","RPTOR","PLK1","CDK12","CUL3","PP2A","CDKN1A"],"other_free_text":[]},"mechanistic_narrative":"EIF4EBP1 (4E-BP1) is an intrinsically disordered translational repressor that, in its hypophosphorylated state, binds eIF4E via a canonical YXXXXLΦ motif and an adjacent secondary interface to block assembly of the eIF4F cap-dependent translation initiation complex [PMID:7939721, PMID:26170285]. mTORC1, scaffolded by Raptor through dual RAIP- and TOS-motif tethering, hierarchically phosphorylates 4E-BP1—first at Thr37/46 as a priming event, then at Thr70 and Ser65—inducing a disorder-to-order conformational switch that releases eIF4E; additional kinases including CDK12 (Ser65/Thr70), CDK1, p38/MSK1, and PLK1 and the phosphatase PP2A further tune 4E-BP1 phosphorylation in context-dependent ways [PMID:10364159, PMID:33852892, PMID:30819820, PMID:11777913, PMID:26199279]. Transcriptional control of 4E-BP1 by ATF4 (ER stress), Smad4/TGFβ (growth arrest), and Snail (repression), together with post-translational regulation by O-GlcNAcylation-dependent stabilization opposing CUL3-mediated proteasomal degradation, adjusts 4E-BP1 protein levels to match cellular demand [PMID:18316032, PMID:19834456, PMID:29263324, PMID:26998719]. Beyond translational control, 4E-BP1 regulates adipose tissue metabolism through PGC-1α translation, maintains mitochondrial complex III integrity to prevent senescence, supports oocyte meiotic spindle assembly, modulates circadian VIP expression in the SCN, and mediates cardiac survival downstream of mTORC1 [PMID:11590436, PMID:36929036, PMID:23852387, PMID:23972597, PMID:20644257]."},"prefetch_data":{"uniprot":{"accession":"Q13541","full_name":"Eukaryotic translation initiation factor 4E-binding protein 1","aliases":["Phosphorylated heat- and acid-stable protein regulated by insulin 1","PHAS-I"],"length_aa":118,"mass_kda":12.6,"function":"Repressor of translation initiation that regulates EIF4E activity by preventing its assembly into the eIF4F complex: hypophosphorylated form competes with EIF4G1/EIF4G3 and strongly binds to EIF4E, leading to repress translation. In contrast, hyperphosphorylated form dissociates from EIF4E, allowing interaction between EIF4G1/EIF4G3 and EIF4E, leading to initiation of translation. Mediates the regulation of protein translation by hormones, growth factors and other stimuli that signal through the MAP kinase and mTORC1 pathways","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q13541/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EIF4EBP1","classification":"Not Classified","n_dependent_lines":76,"n_total_lines":1208,"dependency_fraction":0.06291390728476821},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EIF4EBP1","total_profiled":1310},"omim":[{"mim_id":"619537","title":"ANGEL HOMOLOG 1; ANGEL1","url":"https://www.omim.org/entry/619537"},{"mim_id":"619331","title":"MTOR-ASSOCIATED PROTEIN, EAK7 HOMOLOG; MEAK7","url":"https://www.omim.org/entry/619331"},{"mim_id":"619294","title":"NIBAN APOPTOSIS REGULATOR 1; NIBAN1","url":"https://www.omim.org/entry/619294"},{"mim_id":"616899","title":"TBC1 DOMAIN-CONTAINING KINASE; TBCK","url":"https://www.omim.org/entry/616899"},{"mim_id":"614061","title":"OLFACTOMEDIN 4; OLFM4","url":"https://www.omim.org/entry/614061"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"pancreas","ntpm":309.6}],"url":"https://www.proteinatlas.org/search/EIF4EBP1"},"hgnc":{"alias_symbol":["PHAS-I","4E-BP1"],"prev_symbol":[]},"alphafold":{"accession":"Q13541","domains":[{"cath_id":"-","chopping":"17-68","consensus_level":"high","plddt":81.9613,"start":17,"end":68}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13541","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13541-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13541-F1-predicted_aligned_error_v6.png","plddt_mean":71.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EIF4EBP1","jax_strain_url":"https://www.jax.org/strain/search?query=EIF4EBP1"},"sequence":{"accession":"Q13541","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13541.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13541/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13541"}},"corpus_meta":[{"pmid":"10364159","id":"PMC_10364159","title":"Regulation of 4E-BP1 phosphorylation: a novel two-step mechanism.","date":"1999","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/10364159","citation_count":1096,"is_preprint":false},{"pmid":"9204908","id":"PMC_9204908","title":"Phosphorylation of the translational repressor PHAS-I by the mammalian target of rapamycin.","date":"1997","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/9204908","citation_count":813,"is_preprint":false},{"pmid":"7939721","id":"PMC_7939721","title":"PHAS-I as a link between mitogen-activated protein kinase and translation initiation.","date":"1994","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/7939721","citation_count":616,"is_preprint":false},{"pmid":"8599949","id":"PMC_8599949","title":"Rapamycin blocks the phosphorylation of 4E-BP1 and inhibits cap-dependent initiation of translation.","date":"1996","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/8599949","citation_count":575,"is_preprint":false},{"pmid":"9334222","id":"PMC_9334222","title":"Regulation of eIF-4E BP1 phosphorylation by mTOR.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9334222","citation_count":412,"is_preprint":false},{"pmid":"12747827","id":"PMC_12747827","title":"TOS motif-mediated raptor binding regulates 4E-BP1 multisite phosphorylation and function.","date":"2003","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/12747827","citation_count":399,"is_preprint":false},{"pmid":"20609351","id":"PMC_20609351","title":"4E-BP1 is a key effector of the oncogenic activation of the AKT and ERK signaling pathways that integrates their function in tumors.","date":"2010","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/20609351","citation_count":347,"is_preprint":false},{"pmid":"11590436","id":"PMC_11590436","title":"Adipose tissue reduction in mice lacking the translational inhibitor 4E-BP1.","date":"2001","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11590436","citation_count":311,"is_preprint":false},{"pmid":"21841310","id":"PMC_21841310","title":"Human Merkel cell polyomavirus small T antigen is an oncoprotein targeting the 4E-BP1 translation regulator.","date":"2011","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/21841310","citation_count":295,"is_preprint":false},{"pmid":"20644257","id":"PMC_20644257","title":"MTORC1 regulates cardiac function and myocyte survival through 4E-BP1 inhibition in mice.","date":"2010","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/20644257","citation_count":291,"is_preprint":false},{"pmid":"15501954","id":"PMC_15501954","title":"Activation of the Akt/mammalian target of rapamycin/4E-BP1 pathway by ErbB2 overexpression predicts tumor progression in breast cancers.","date":"2004","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/15501954","citation_count":267,"is_preprint":false},{"pmid":"26901143","id":"PMC_26901143","title":"4E-BP1, a multifactor regulated multifunctional protein.","date":"2016","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/26901143","citation_count":256,"is_preprint":false},{"pmid":"11001751","id":"PMC_11001751","title":"4E-BP1 and S6K1: translational integration sites for nutritional and hormonal information in muscle.","date":"2000","source":"American journal of physiology. 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MAP kinase phosphorylates Ser-64 of 4E-BP1, which disrupts the 4E-BP1/eIF4E interaction and relieves translational repression.\",\n      \"method\": \"In vitro binding assays, immobilized PHAS-I pulldown, mRNA cap affinity resin, in vitro phosphorylation by MAP kinase\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in vitro with multiple orthogonal methods, foundational paper\",\n      \"pmids\": [\"7939721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"4E-BP1 (PHAS-I) is a 117 amino acid heat-stable protein that is rapidly phosphorylated in response to insulin and is expressed at highest levels in fat and skeletal muscle.\",\n      \"method\": \"Molecular cloning, in vitro translation, tissue expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning and biochemical characterization\",\n      \"pmids\": [\"8170978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Rapamycin blocks 4E-BP1 phosphorylation, activating 4E-BP1 and causing inhibition of cap-dependent (but not cap-independent) translation; the rapamycin-FKBP12 complex is the effector, and excess FK506 reverses this inhibition.\",\n      \"method\": \"In vitro translation assays, pharmacological inhibition in NIH 3T3 cells, polysome analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional in vitro and cell-based assays with pharmacological controls, highly cited\",\n      \"pmids\": [\"8599949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"mTOR (FRAP) directly phosphorylates 4E-BP1 (PHAS-I) on serine and threonine residues in vitro, and this phosphorylation inhibits binding of 4E-BP1 to eIF4E; mTOR is a terminal kinase in the pathway coupling mitogenic stimulation to 4E-BP1 phosphorylation.\",\n      \"method\": \"In vitro kinase assays with immunoprecipitated mTOR, cell-based phosphorylation studies with rapamycin-sensitive mTOR mutants\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro kinase assay, replicated across labs\",\n      \"pmids\": [\"9204908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"mTOR regulates 4E-BP1 and p70 S6 kinase in a parallel (not sequential) manner; rapamycin-resistant mTOR mutants protect both 4E-BP1 and S6K from rapamycin-induced dephosphorylation, and this protection requires an active mTOR catalytic domain.\",\n      \"method\": \"Expression of rapamycin-resistant mTOR mutants, in situ phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via rapamycin-resistant mutants, multiple controls\",\n      \"pmids\": [\"9334222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"In rat adipocytes, insulin stimulates phosphorylation of 4E-BP1 at Thr36, Thr45, Ser64, Thr69, and Ser82 (all Ser/Thr-Pro motifs), and all five sites are decreased by rapamycin; phosphorylation of Thr36 alone is insufficient for dissociation of the 4E-BP1/eIF4E complex.\",\n      \"method\": \"Phosphopeptide mapping by reverse-phase HPLC and Edman degradation, in vitro MAP kinase phosphorylation, cell-based studies with rapamycin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct phosphosite identification by sequencing, site-specific mutagenesis functional analysis\",\n      \"pmids\": [\"9092573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Heat shock causes dephosphorylation of 4E-BP1 in H35 hepatoma cells and other cell lines, which is accompanied by increased eIF4E binding to 4E-BP1 and inhibition of translation; this dephosphorylation is reversed by the phosphatase inhibitor okadaic acid.\",\n      \"method\": \"Phosphorylation analysis by gel shift, eIF4E pulldown, phosphatase inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-based assay with phosphatase inhibitor mechanistic follow-up\",\n      \"pmids\": [\"9341116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"4E-BP1 is completely disordered in its free state (no regions of local order detectable by NMR), indicating that its binding to eIF4E is an induced-fit interaction with a completely disordered protein.\",\n      \"method\": \"NMR spectroscopy (double and triple resonance, steady-state NOEs)\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structural characterization\",\n      \"pmids\": [\"9684899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"mTOR/FRAP phosphorylates 4E-BP1 on Thr-37 and Thr-46 in vitro (even when 4E-BP1 is bound to eIF4E), and these phosphorylations serve as a priming event required for subsequent phosphorylation of carboxy-terminal serum-sensitive sites; loss of these priming sites prevents downstream multi-site phosphorylation.\",\n      \"method\": \"In vitro kinase assays with recombinant FRAP, phosphopeptide mapping, mass spectrometry, site-directed mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro kinase assay combined with MS phosphosite identification and mutagenesis, highly cited\",\n      \"pmids\": [\"10364159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"4E-BP1 exists as 8-10 phosphorylation isoforms resolvable by 2D gel electrophoresis; heat shock induces rapid dephosphorylation of 4E-BP1 concurrent with translation inhibition, and phosphatase inhibitor okadaic acid restores phosphorylation during heat shock.\",\n      \"method\": \"2D IEF/SDS-PAGE immunoblotting, [32P] metabolic labeling, okadaic acid treatment\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple isoforms identified by 2D gel, phosphatase inhibitor confirms phosphatase-dependent dephosphorylation\",\n      \"pmids\": [\"10504405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"mTOR directly phosphorylates 4E-BP1 at Thr-36/45 and (with an activating antibody) at Thr-69 and Ser-64 in vitro; phosphorylation of Thr-36/45 by mTOR facilitates subsequent Thr-69 and Ser-64 phosphorylation in an ordered hierarchy; phosphorylation of Ser-64 is most rapamycin-sensitive.\",\n      \"method\": \"In vitro kinase assay with immunoprecipitated mTOR, phospho-specific antibodies, rapamycin-FKBP12 inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with phospho-specific antibodies confirming ordered phosphorylation\",\n      \"pmids\": [\"10942774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Cap-dependent binding of 4E-BP1 to eIF4E is enhanced ~100-fold in the presence of m7GTP; phosphorylation of 4E-BP1 weakens interaction with eIF4E regardless of cap status, and pre-formed 4E-BP1/eIF4E complexes are not dissociated by phosphorylation, suggesting regulation occurs at the free 4E-BP1 state.\",\n      \"method\": \"Surface plasmon resonance binding analysis\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — direct biophysical binding assay with defined conditions\",\n      \"pmids\": [\"10772338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"4E-BP1 knockout mice have markedly smaller white fat pads; knockout males display increased metabolic rate and white adipose tissue containing multilocular brown-adipocyte-like cells expressing UCP1; translation of PGC-1α is increased in white adipose tissue of knockout mice, demonstrating 4E-BP1 as a regulator of adipogenesis and metabolism.\",\n      \"method\": \"Gene knockout in mice (Eif4ebp1-/-), histology, metabolic rate measurement, Western blotting, polysome analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined metabolic phenotype and molecular mechanism (PGC-1α translation)\",\n      \"pmids\": [\"11590436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"During liver regeneration after partial hepatectomy in rats, 4E-BP1 phosphorylation is induced in a rapamycin-insensitive manner, demonstrating that mTOR-independent kinases can phosphorylate 4E-BP1 in vivo.\",\n      \"method\": \"Partial hepatectomy rat model, phospho-specific antibodies, rapamycin treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo model with specific phospho-antibodies and pharmacological controls\",\n      \"pmids\": [\"11278364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Phosphorylation events govern the proapoptotic potency of 4E-BP1; phosphorylation site mutants of 4E-BP1 that more strongly repress cap-dependent translation are more potently proapoptotic; at maximum translational repression, cap-independent (IRES-dependent) translation is activated, reducing apoptosis.\",\n      \"method\": \"Expression of phosphorylation site mutants, cap-dependent vs. IRES-dependent translation reporters, apoptosis assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic mutagenesis with dual-luciferase reporters and apoptosis readouts\",\n      \"pmids\": [\"11909977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Both the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 are required for efficient in vitro phosphorylation by mTOR and for binding to Raptor; raptor overexpression enhances phosphorylation of wild-type but not motif-mutant 4E-BP1, indicating Raptor serves as a docking scaffold for 4E-BP1 phosphorylation by mTOR.\",\n      \"method\": \"In vitro mTOR kinase assay with recombinant PHAS-I mutants, co-immunoprecipitation with HA-tagged raptor, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted in vitro kinase assay with mutagenesis and co-IP\",\n      \"pmids\": [\"12665511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A functional TOS motif in 4E-BP1 is required for binding to Raptor, for efficient in vitro phosphorylation by mTOR/Raptor complex, and for phosphorylation at all mTOR-regulated sites in vivo; TOS motif mutation (F114A) causes reduced cell size, demonstrating TOS-dependent mTOR/Raptor-mediated regulation of cell growth.\",\n      \"method\": \"Co-immunoprecipitation, in vitro mTOR/raptor kinase assay, site-directed mutagenesis, cell size measurement\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution, reciprocal Co-IP, mutagenesis, cellular phenotype\",\n      \"pmids\": [\"12747827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Ser-64 and Ser-111 are not required for insulin-stimulated dissociation of 4E-BP1 from eIF4E; Thr-36/45 phosphorylation is implicated as the primary determinant of 4E-BP1/eIF4E dissociation.\",\n      \"method\": \"Mutagenesis (Ala-64 and Ala-111 mutants), in situ phosphorylation analysis, eIF4E binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with binding functional readout\",\n      \"pmids\": [\"14507920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"4E-BP1 binds to the eIF4E homologous protein 4EHP via its canonical eIF4E-binding motif (Y54 and L59 required); 4EHP overexpression creates a negative feedback loop inhibiting upstream signaling to 4E-BP1 and S6K1, and this feedback requires the 4E-BP1-binding capability of 4EHP.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of 4E-BP1 and 4EHP binding interfaces\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with mutagenesis of both binding partners, single lab\",\n      \"pmids\": [\"15094042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SR protein SF2/ASF promotes translation initiation of bound mRNAs by suppressing 4E-BP1 activity; SF2/ASF interacts with both mTOR and the phosphatase PP2A to regulate 4E-BP1 phosphorylation, functioning as an adaptor to recruit translation regulatory molecules to specific mRNAs.\",\n      \"method\": \"Co-immunoprecipitation, translation reporter assays, mTOR/PP2A interaction studies\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with mTOR and PP2A, translation reporter functional validation\",\n      \"pmids\": [\"18439897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ATF4 directly transcriptionally induces 4E-BP1 expression under ER stress; elevated 4E-BP1 in pancreatic beta cells under ER stress is required for cell survival; Eif4ebp1 deletion increases susceptibility to ER stress-mediated apoptosis and accelerates beta cell loss in diabetic mouse models.\",\n      \"method\": \"Chromatin IP, 4E-BP1 promoter-reporter assay, Eif4ebp1 knockout mouse, MIN6 beta cell knockdown, diabetic mouse models\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct transcription factor binding, gene KO with clear phenotype\",\n      \"pmids\": [\"18316032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"UVB irradiation induces 4E-BP1 phosphorylation at Thr-36, Thr-45, Ser-64, and Thr-69 via the p38/MSK1 pathway (not PI3K/Akt); dominant-negative p38 and MSK1 block UVB-induced 4E-BP1 phosphorylation and eIF4E release.\",\n      \"method\": \"Dominant-negative kinase expression, pharmacological inhibitors (p38 inhibitors, wortmannin, H89), in vivo phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — dominant-negative mutants combined with inhibitors, multiple phosphosites confirmed\",\n      \"pmids\": [\"11777913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"4E-BP1 is a transcriptional target of Smad4; TGFβ-stimulated Smad4 enhances 4E-BP1 gene-promoter activity through a conserved Smad-binding element; 4E-BP1 is required for TGFβ-mediated antiproliferative effects.\",\n      \"method\": \"Smad4 ChIP, 4E-BP1 promoter-reporter assay, siRNA knockdown, 4E-BP1 knockout MEFs, Smad4+/+ vs Smad4-/- cell lines\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP confirming direct promoter binding, KO MEFs with functional readout\",\n      \"pmids\": [\"19834456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"mTORC1 ablation in mouse myocardium causes fatal dilated cardiomyopathy with 4E-BP1 accumulation; simultaneous ablation of 4E-BP1 together with mTOR markedly improves cardiac apoptosis, heart function, and survival, demonstrating that 4E-BP1 mediates the deleterious effects of reduced mTOR activity in the heart.\",\n      \"method\": \"Cardiac-specific Mtor knockout mouse, double knockout of Mtor and Eif4ebp1, histology, echocardiography, survival analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional double-KO with defined cardiac phenotype\",\n      \"pmids\": [\"20644257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Non-phosphorylated 4E-BP1 interacts with p21 protein and induces its proteasomal degradation; mTORC1 activation phosphorylates 4E-BP1, preventing this p21-destabilizing interaction and thereby stabilizing p21 protein in HNSCC cells.\",\n      \"method\": \"Co-immunoprecipitation, Western blotting with phospho-4E-BP1 mutants, siRNA knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP finding, replicated with phospho-mutants\",\n      \"pmids\": [\"26832959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"4E-BP1 and ERK pathways converge to regulate cap-dependent translation via 4E-BP1; both AKT and ERK pathways independently regulate 4E-BP1 phosphorylation, and their combined inhibition is required to fully suppress translation in tumors with co-activation of both pathways; knockdown of 4E-BP1 reduces dependence on AKT/ERK signaling.\",\n      \"method\": \"siRNA knockdown, dominant-active 4E-BP1 mutant, inhibitor combinations, polysome profiling\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches including genetic manipulation and pharmacology\",\n      \"pmids\": [\"20609351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The disorder-to-order transition of 4E-BP1 is required for tight eIF4E binding; phosphorylation of S65 destabilizes the α-helical conformation of the 4E-BP1 binding motif, biasing the free energy landscape toward the unfolded state that cannot bind eIF4E.\",\n      \"method\": \"Isothermal calorimetry, circular dichroism, NMR, computational modeling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple biophysical methods combined with computational modeling\",\n      \"pmids\": [\"20880835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MCV small T antigen acts downstream of mTORC1 to maintain 4E-BP1 hyperphosphorylation and dysregulated cap-dependent translation; MCV sT-induced hyperphosphorylation of 4E-BP1 Ser65 is resistant to mTORC1/mTORC2 inhibitors; constitutively active non-phosphorylatable 4E-BP1 antagonizes MCV sT transformation.\",\n      \"method\": \"Dominant-active 4E-BP1 mutant expression, mTORC1/2 inhibitor treatment, cell transformation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rescue experiment with non-phosphorylatable 4E-BP1 mutant, pharmacological dissection\",\n      \"pmids\": [\"21841310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"4E-BP1 co-localizes with PLK1 at centrosomes during mitosis; 4E-BP1 interacts directly with PLK1 in vitro and in vivo via its C-terminal aa 77-118; PLK1 phosphorylates 4E-BP1 in vitro; 4E-BP1 depletion causes polyploidy, chromosomal misalignment, multi-polar spindles, and sensitizes cells to paclitaxel.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay with PLK1, siRNA knockdown, immunofluorescence co-localization\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vitro kinase assay and Co-IP with cellular phenotype, single lab\",\n      \"pmids\": [\"22918237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Phosphorylation at Thr46 alone (rapamycin-insensitive) is sufficient to prevent eIF4E:4E-BP1 binding, establishing that the initial rapamycin-insensitive mTORC1 phosphorylation at Thr46 directly regulates the 4E-BP1/eIF4E interaction.\",\n      \"method\": \"Site-directed mutagenesis of 4E-BP1, eIF4E co-immunoprecipitation, rapamycin and mTOR kinase inhibitor treatment\",\n      \"journal\": \"F1000Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with functional binding assay, single lab\",\n      \"pmids\": [\"24358826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"mTOR/4E-BP1 signaling in the suprachiasmatic nucleus (SCN) is rhythmically regulated; 4E-BP1 preferentially represses VIP mRNA translation; Eif4ebp1 knockout mice display accelerated re-entrainment to shifted light/dark cycles and are more resistant to constant light-induced rhythm disruption; Mtor+/- mice show decreased VIP expression and increased susceptibility to constant light.\",\n      \"method\": \"Eif4ebp1 knockout mouse, Mtor heterozygous mouse, VIP immunoassay, circadian behavior analysis, mTOR inhibitor treatment\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and heterozygous models with defined molecular and behavioral phenotypes\",\n      \"pmids\": [\"23972597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"O-GlcNAcylation of 4E-BP1 in hyperglycemic conditions enhances its interaction with eIF4E and causes a shift from cap-dependent to cap-independent mRNA translation; this glucose-induced translational shift does not occur in 4E-BP1-deficient cells.\",\n      \"method\": \"4E-BP1 knockout cells, bicistronic luciferase reporter assay, pulsed SILAC proteomics, phlorizin treatment of STZ-diabetic mice\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — 4E-BP1 KO rescue experiment with translation reporters, in vivo confirmation\",\n      \"pmids\": [\"23434932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Phosphorylated EIF4EBP1 localizes to the spindle apparatus in mouse oocytes during meiosis in a phosphorylation-site-specific manner: Ser65-phosphorylated 4E-BP1 localizes at spindle poles, Thr70-phosphorylated 4E-BP1 localizes on the spindle; CDK1 and mTOR are the main positive regulators after nuclear envelope breakdown; expression of dominant-negative 4E-BP1 causes spindle abnormality.\",\n      \"method\": \"Immunofluorescence, Western blotting, CDK1 and mTOR inhibitors, dominant-negative 4E-BP1 expression, mouse oocyte maturation model\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — immunofluorescence localization with kinase inhibitor dissection and dominant-negative functional readout\",\n      \"pmids\": [\"23852387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The 2.1-Å crystal structure of mouse eIF4E complexed with m7GTP and a 4E-BP1 fragment (residues 50-84) reveals two binding motifs: the canonical YXXXXLΦ motif and a proline-turn-helix extension containing S65 and T70 phosphorylation sites; a C-terminal motif (motif 3) is critical for 4E-BP1-mediated cell cycle arrest and partially overlaps with the 4EGI-1 binding site.\",\n      \"method\": \"X-ray crystallography at 2.1 Å, cell cycle arrest assays with 4E-BP1 truncation mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional validation\",\n      \"pmids\": [\"26170285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Enhanced 4E-BP1 activity in mouse skeletal muscle protects against age- and diet-induced insulin resistance and metabolic decline; 4E-BP1-mediated metabolic protection occurs through increased translation of PGC-1α and enhanced mitochondrial respiratory function; skeletal muscle 4E-BP1 also promotes FGF21 secretion preserving brown adipose tissue.\",\n      \"method\": \"Muscle-specific 4E-BP1 transgenic mice, metabolic rate measurements, polysome/translation assays, adipose tissue phenotyping\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific transgenic with multiple mechanistic readouts\",\n      \"pmids\": [\"26121750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Snail transcriptionally represses 4E-BP1 by binding to three E-boxes in the human 4E-BP1 promoter; Snail overexpression promotes cap-dependent translation and reduces sensitivity to mTOR kinase inhibitors; pharmacological inhibition of Snail restores 4E-BP1 expression and sensitizes cancer cells to mTOR inhibitors.\",\n      \"method\": \"Chromatin IP, promoter-reporter assay, Snail overexpression and knockdown, polysome profiling, tumor xenograft\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP confirming direct promoter binding, genetic and pharmacological validation\",\n      \"pmids\": [\"29263324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In mouse oocytes, 4E-BP1 undergoes meiosis-resumption-dependent phosphorylation by CDK1 and mTOR (but not PLK1); CDK1 promotes 4E-BP1 phosphorylation via phosphorylation and activation of mTOR; dominant-negative 4E-BP1 impairs translation and causes spindle abnormalities; this mTOR regulatory pathway is also present in human oocytes.\",\n      \"method\": \"Immunofluorescence in mouse/human oocytes, CDK1/PLK1/mTOR inhibitors, dominant-negative 4E-BP1 expression, cumulus cell comparison\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis plus dominant-negative functional readout in oocytes\",\n      \"pmids\": [\"28272965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"lncRNA H19 directly interacts with 4E-BP1 at its TOS motif and competitively inhibits 4E-BP1 binding to Raptor, thereby blocking mTORC1-mediated 4E-BP1 phosphorylation without affecting S6K1 activation.\",\n      \"method\": \"RNA immunoprecipitation, co-immunoprecipitation of H19/4E-BP1/Raptor, TOS motif competition assay, 4E-BP1 phosphorylation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNA-IP and protein Co-IP with competition mechanism, mechanistically defined\",\n      \"pmids\": [\"30397197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK12 phosphorylates 4E-BP1 at S65 and T70 (Ser-Pro sites); prior mTORC1 phosphorylation at T37/T46 facilitates CDK12 phosphorylation; CDK12-dependent 4E-BP1 phosphorylation controls exchange of 4E-BP1 with eIF4G at the 5' cap of CHK1 and other target mRNAs; CDK12 depletion causes chromosome misalignment and segregation defects.\",\n      \"method\": \"In vitro CDK12 kinase assay, RIP-seq, Ribo-seq, confocal imaging, mutagenesis of phosphorylation sites\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay combined with genome-wide ribosome profiling and RIP-seq\",\n      \"pmids\": [\"30819820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"rapamycin-insensitive mTORC1 signaling via 4E-BP1 (not canonical PI3K/Akt) is a critical pathway for TGF-β1-stimulated collagen synthesis in human lung fibroblasts; CRISPR-Cas9 deletion of 4E-BP1 confirms its essential role in fibrogenesis.\",\n      \"method\": \"CRISPR-Cas9 gene editing, mTOR inhibitors, collagen synthesis assays, precision-cut lung slices\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO in multiple cell types with mechanistic pathway dissection\",\n      \"pmids\": [\"30602778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In HNSCC, mTOR persistently restrains 4E-BP1 via phosphorylation; CRISPR/Cas9 deletion of 4E-BP1 reduces sensitivity to mTOR inhibitors both in vitro and in vivo; conditional expression of phosphorylation-resistant 4E-BP1 disrupts the translation initiation complex and prevents tumor growth.\",\n      \"method\": \"CRISPR-Cas9 4E-BP1 deletion, conditional phosphorylation-resistant 4E-BP1 expression, 4e-bp1/2 knockout mouse carcinogenesis models, tumor xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO and conditional expression with in vivo tumor phenotype\",\n      \"pmids\": [\"30894372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"O-GlcNAcylation of 4E-BP1 stabilizes it by slowing degradation via its PEST motif; a CUL3-containing E3 ubiquitin ligase complex binds the PEST motif to mediate 4E-BP1 polyubiquitination and turnover; O-GlcNAcylation of the PEST motif prevents this ubiquitination, increasing 4E-BP1 protein levels in diabetic retinas.\",\n      \"method\": \"PEST motif mutagenesis, CUL3 co-immunoprecipitation, ubiquitination assays, O-GlcNAcase inhibitor treatment, pulse-chase degradation assay\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis, Co-IP of E3 ligase, and ubiquitination assay with functional degradation readout\",\n      \"pmids\": [\"26998719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"By NMR spectroscopy, the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 bind to separate sites on Raptor, creating avidity-based tethering; this dual tethering orients the flexible central region toward the mTORC1 kinase site; phosphorylation-induced conformational switching of 4E-BP1 explains the hierarchy of phosphorylation; mTORC1 recognizes both free and eIF4E-bound 4E-BP1.\",\n      \"method\": \"NMR spectroscopy of 4E-BP1 interaction with Raptor, mutagenesis, in vitro mTORC1 kinase assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution NMR with biochemical validation, explains hierarchy of phosphorylation\",\n      \"pmids\": [\"33852892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p53 activation leads to proteasome-mediated truncation of 4E-BP1, producing a stable, hypophosphorylated, truncated form that binds eIF4E preferentially over full-length 4E-BP1, contributing to long-term inhibition of cap-dependent translation.\",\n      \"method\": \"Proteasome inhibitor treatment, co-immunoprecipitation, pulse-chase turnover assay, p53 activation\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — pharmacological dissection with binding and turnover assays, single lab\",\n      \"pmids\": [\"18021075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RhoE inhibits 4E-BP1 phosphorylation independently of mTOR (as S6K phosphorylation and mTOR/Raptor dynamics are unaffected), preventing eIF4E release from 4E-BP1 and inhibiting cap-dependent translation; eIF4E overexpression rescues both cell cycle progression and Ras-induced transformation in RhoE-expressing cells.\",\n      \"method\": \"RhoE overexpression, pharmacological comparisons with rapamycin, eIF4E rescue, translation reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mTOR-independence established by S6K controls, eIF4E rescue confirms mechanism\",\n      \"pmids\": [\"19850923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PP2A-mediated dephosphorylation of 4E-BP1 is the dominant mechanism controlling 4E-BP1 phosphorylation status in the retina in response to inhibition of glycolysis; glycolytic inhibition dephosphorylates 4E-BP1 independently of mTORC1 through phosphatase activation.\",\n      \"method\": \"Ex vivo rat retina preparations, phosphatase inhibitors (okadaic acid, calyculin A, cadmium), 2-deoxyglucose, mTORC1 activity assays\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection distinguishing mTORC1-independent phosphatase mechanism\",\n      \"pmids\": [\"26199279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"4E-BP1 loss in pancreatic cancer cells leads to selective upregulation of translation of mRNAs encoding DNA replication/repair proteins (including RRM2 and CDC6), making DNA replication insensitive to mTOR inhibitors; this effect is confirmed in 4E-BP1/2-deleted mice showing increased acinar proliferation after pancreatitis.\",\n      \"method\": \"Genome-wide polysome profiling, 4E-BP1 depletion, 4E-BP1/2 double-knockout mouse, eIF4A inhibitor treatment\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ribosome profiling with genetic KO validation\",\n      \"pmids\": [\"31672935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"4E-BP1 stabilizes mitochondrial respiration complex III proteins (including UQCRC2) at the translational level; 4E-BP1 deficiency in human MSCs destabilizes complex III subunits, increases mitochondrial ROS, and accelerates cellular senescence; ectopic 4E-BP1 expression rescues these mitochondrial defects.\",\n      \"method\": \"4E-BP1 gene inactivation by CRISPR in hMSCs, ectopic expression rescue, Western blotting of respiratory complex subunits, mitochondrial respiration assays, ROS measurement\",\n      \"journal\": \"Protein & cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with rescue experiment and mitochondrial functional readout\",\n      \"pmids\": [\"36929036\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EIF4EBP1/4E-BP1 is an intrinsically disordered translational repressor that, in its hypophosphorylated state, binds eIF4E to block cap-dependent translation initiation; mTORC1 phosphorylates 4E-BP1 hierarchically—first at Thr37/46 (priming, rapamycin-insensitive, mediated by dual RAIP/TOS-motif tethering to Raptor) and then at Thr70/Ser65 (the latter facilitated by CDK12)—inducing a disorder-to-order conformational switch that releases eIF4E for assembly of the eIF4F translation initiation complex; additional kinases (MAP kinase, p38/MSK1, CDK1, PLK1) and phosphatases (PP2A) also regulate 4E-BP1 phosphorylation in specific contexts; 4E-BP1 expression is transcriptionally controlled by Smad4/TGFβ, PI3K (repressive), ATF4 (ER stress), and Snail (repressive), and post-translationally regulated by O-GlcNAcylation-dependent stabilization and CUL3-mediated proteasomal degradation; beyond translational control, 4E-BP1 interacts with PLK1 at centrosomes to maintain mitotic spindle integrity, interacts with p21 to regulate its stability, and plays essential roles in adipogenesis, cardiac function, circadian entrainment, oocyte meiosis, mitochondrial homeostasis, and stem cell senescence.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"EIF4EBP1 (4E-BP1) is an intrinsically disordered translational repressor that, in its hypophosphorylated state, binds eIF4E via a canonical YXXXXLΦ motif and an adjacent secondary interface to block assembly of the eIF4F cap-dependent translation initiation complex [PMID:7939721, PMID:26170285]. mTORC1, scaffolded by Raptor through dual RAIP- and TOS-motif tethering, hierarchically phosphorylates 4E-BP1—first at Thr37/46 as a priming event, then at Thr70 and Ser65—inducing a disorder-to-order conformational switch that releases eIF4E; additional kinases including CDK12 (Ser65/Thr70), CDK1, p38/MSK1, and PLK1 and the phosphatase PP2A further tune 4E-BP1 phosphorylation in context-dependent ways [PMID:10364159, PMID:33852892, PMID:30819820, PMID:11777913, PMID:26199279]. Transcriptional control of 4E-BP1 by ATF4 (ER stress), Smad4/TGFβ (growth arrest), and Snail (repression), together with post-translational regulation by O-GlcNAcylation-dependent stabilization opposing CUL3-mediated proteasomal degradation, adjusts 4E-BP1 protein levels to match cellular demand [PMID:18316032, PMID:19834456, PMID:29263324, PMID:26998719]. Beyond translational control, 4E-BP1 regulates adipose tissue metabolism through PGC-1α translation, maintains mitochondrial complex III integrity to prevent senescence, supports oocyte meiotic spindle assembly, modulates circadian VIP expression in the SCN, and mediates cardiac survival downstream of mTORC1 [PMID:11590436, PMID:36929036, PMID:23852387, PMID:23972597, PMID:20644257].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Identification of 4E-BP1 as a direct eIF4E-binding protein whose phosphorylation by MAP kinase disrupts this interaction established the paradigm that cap-dependent translation is regulated by a phosphorylation-sensitive repressor.\",\n      \"evidence\": \"In vitro binding assays with immobilized PHAS-I and cap-affinity chromatography; molecular cloning revealing a 117-aa heat-stable, insulin-responsive protein\",\n      \"pmids\": [\"7939721\", \"8170978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the physiological kinase in cells was unclear\", \"Phosphorylation sites not yet mapped comprehensively\", \"Mechanism by which phosphorylation disrupts binding was unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstration that mTOR directly phosphorylates 4E-BP1 and that rapamycin blocks this phosphorylation placed 4E-BP1 as a direct mTOR substrate and explained rapamycin's translational effects.\",\n      \"evidence\": \"In vitro kinase assays with immunoprecipitated mTOR; rapamycin-resistant mTOR mutants protecting 4E-BP1 phosphorylation; phosphopeptide mapping identifying five Ser/Thr-Pro sites in rat adipocytes\",\n      \"pmids\": [\"9204908\", \"9334222\", \"9092573\", \"8599949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ordered hierarchy of phosphorylation events not yet resolved\", \"Role of individual sites in eIF4E release unclear\", \"Heat-shock-induced dephosphorylation mechanism (phosphatase identity) undefined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Reconstitution of mTOR-mediated phosphorylation revealed that Thr37/46 are priming sites whose modification is required for subsequent phosphorylation at C-terminal sites, establishing the hierarchical phosphorylation model.\",\n      \"evidence\": \"In vitro FRAP kinase assay with recombinant 4E-BP1, mass spectrometry phosphosite identification, site-directed mutagenesis showing loss of downstream phosphorylation upon Thr37/46 mutation\",\n      \"pmids\": [\"10364159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for how priming enables downstream phosphorylation unknown\", \"Whether hierarchy operates identically in vivo across tissues untested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Biophysical and kinase studies refined the ordered phosphorylation model and showed that phosphorylation weakens eIF4E binding regardless of cap status, but cannot dissociate preformed complexes, implying regulation occurs at the level of free 4E-BP1.\",\n      \"evidence\": \"Surface plasmon resonance quantifying ~100-fold cap-enhanced binding; in vitro mTOR kinase assay with activating antibody confirming Ser64 as most rapamycin-sensitive site\",\n      \"pmids\": [\"10942774\", \"10772338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of phosphorylation-induced conformational change unresolved\", \"In vivo dynamics of complex formation/dissociation not measured\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"4E-BP1 knockout mice revealed unexpected metabolic functions—reduced white adipose tissue with browning and increased PGC-1α translation—demonstrating that 4E-BP1's translational repression has systemic physiological consequences beyond cell-autonomous growth control.\",\n      \"evidence\": \"Eif4ebp1−/− mice with histology, metabolic rate measurement, and polysome analysis in white adipose tissue\",\n      \"pmids\": [\"11590436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of 4E-BP2/3 compensation unclear\", \"Tissue-specific mRNA targets beyond PGC-1α not identified\", \"Mechanism linking translational changes to adipocyte fate unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that p38/MSK1 phosphorylates 4E-BP1 upon UVB irradiation independently of PI3K/Akt, and that non-phosphorylatable 4E-BP1 is proapoptotic through maximal cap-dependent translational repression, revealed mTOR-independent regulation and linked 4E-BP1 to apoptosis.\",\n      \"evidence\": \"Dominant-negative p38/MSK1 blocking UVB-induced phosphorylation; systematic phosphorylation-site mutants with apoptosis and dual-luciferase translation reporters\",\n      \"pmids\": [\"11777913\", \"11909977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MSK1 directly phosphorylates 4E-BP1 or acts through intermediary not definitively resolved\", \"Apoptotic target mRNAs not identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of the RAIP and TOS motifs as dual Raptor-binding elements explained how mTORC1 selectively recognizes 4E-BP1 and established Raptor as a scaffold essential for efficient substrate phosphorylation.\",\n      \"evidence\": \"In vitro mTOR kinase assays with RAIP/TOS motif mutants, Raptor co-immunoprecipitation, cell size measurements upon TOS mutation\",\n      \"pmids\": [\"12665511\", \"12747827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for dual-motif recognition unknown\", \"Relative contribution of each motif to phosphorylation hierarchy unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"ATF4-dependent transcriptional induction of 4E-BP1 under ER stress, and the finding that SF2/ASF orchestrates mTOR and PP2A to regulate 4E-BP1 phosphorylation on specific mRNAs, demonstrated that 4E-BP1 is regulated at both transcriptional and phosphatase levels to tune translation in stress contexts.\",\n      \"evidence\": \"ChIP confirming ATF4 binding to the 4E-BP1 promoter; Eif4ebp1−/− beta cells showing ER stress sensitivity; SF2/ASF co-IP with mTOR and PP2A\",\n      \"pmids\": [\"18316032\", \"18439897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of 4E-BP1 transcriptional regulators undefined\", \"PP2A regulatory subunit specificity for 4E-BP1 not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Cardiac-specific mTOR ablation causing lethal cardiomyopathy rescued by 4E-BP1 co-deletion, convergence of AKT and ERK pathways on 4E-BP1 phosphorylation in tumors, and biophysical demonstration that Ser65 phosphorylation destabilizes the α-helical binding conformation collectively established 4E-BP1 as a critical integration node whose conformational switch determines cell fate outcomes.\",\n      \"evidence\": \"Conditional cardiac mTOR/4E-BP1 double KO with echocardiography and survival; siRNA/inhibitor combinations with polysome profiling in cancer cells; ITC, CD, NMR, and computational modeling of phosphorylation-induced disorder\",\n      \"pmids\": [\"20644257\", \"20609351\", \"20880835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo structural dynamics of phosphorylation-induced release from eIF4E not captured\", \"Whether ERK directly or indirectly phosphorylates 4E-BP1 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"PLK1 was identified as a mitotic kinase that directly phosphorylates and interacts with 4E-BP1 at centrosomes, linking 4E-BP1 to spindle integrity beyond its role in translation—a first indication of a non-canonical function.\",\n      \"evidence\": \"Co-immunoprecipitation and immunofluorescence co-localization with PLK1; in vitro PLK1 kinase assay; 4E-BP1 depletion causing multipolar spindles and polyploidy\",\n      \"pmids\": [\"22918237\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PLK1-specific phosphosites on 4E-BP1 not mapped\", \"Whether the spindle function is translation-dependent or translation-independent not established\", \"Single-lab finding not independently confirmed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"4E-BP1 was shown to preferentially repress VIP translation in the SCN to regulate circadian re-entrainment, and O-GlcNAcylation was discovered to enhance eIF4E binding and shift translation mode under hyperglycemia, expanding both the physiological and post-translational regulatory dimensions of 4E-BP1.\",\n      \"evidence\": \"Eif4ebp1−/− mice with circadian behavioral analysis and VIP immunoassay; KO cells with bicistronic reporters and SILAC proteomics under high glucose\",\n      \"pmids\": [\"23972597\", \"23434932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mRNA-selective repression (VIP vs. other SCN transcripts) not defined\", \"O-GlcNAcylation sites on 4E-BP1 not fully mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The 2.1-Å crystal structure of the eIF4E–4E-BP1 complex revealed a bipartite binding interface including a secondary helix containing Ser65/Thr70, providing the first atomic explanation of how phosphorylation at these sites would sterically and conformationally disrupt binding; enhanced 4E-BP1 in skeletal muscle was shown to protect against metabolic decline via PGC-1α and FGF21.\",\n      \"evidence\": \"X-ray crystallography with functional validation by truncation mutants and cell cycle assays; muscle-specific 4E-BP1 transgenic mice with metabolic, translation, and adipose phenotyping\",\n      \"pmids\": [\"26170285\", \"26121750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length 4E-BP1 structure in complex with eIF4E lacking\", \"How FGF21 secretion is translationally controlled by 4E-BP1 unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Snail was identified as a transcriptional repressor of 4E-BP1 via E-box elements, providing a mechanism by which EMT programs bypass mTOR-targeted therapy; CDK1 and mTOR (but not PLK1) were confirmed as the dominant kinases for 4E-BP1 during oocyte meiotic resumption.\",\n      \"evidence\": \"ChIP of Snail on 4E-BP1 promoter, polysome profiling, xenograft sensitivity; pharmacological epistasis in mouse and human oocytes with dominant-negative 4E-BP1\",\n      \"pmids\": [\"29263324\", \"28272965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Snail-mediated 4E-BP1 repression operates outside cancer contexts unknown\", \"Direct CDK1 phosphosites on 4E-BP1 during meiosis not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The lncRNA H19 was found to bind the TOS motif of 4E-BP1 and competitively inhibit Raptor interaction, revealing an RNA-based mechanism that selectively modulates 4E-BP1 phosphorylation without affecting S6K1.\",\n      \"evidence\": \"RNA immunoprecipitation, protein co-IP demonstrating competition between H19 and Raptor for TOS motif binding\",\n      \"pmids\": [\"30397197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other lncRNAs similarly regulate 4E-BP1 unknown\", \"Physiological contexts where H19-mediated regulation is dominant not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CDK12 was identified as a kinase phosphorylating 4E-BP1 at Ser65/Thr70 after mTORC1 priming, controlling the translational switch from 4E-BP1 to eIF4G on CHK1 and other target mRNAs; O-GlcNAcylation was shown to stabilize 4E-BP1 by blocking CUL3-mediated PEST-motif ubiquitination; genome-wide profiling revealed 4E-BP1-dependent selective translation of DNA replication/repair mRNAs.\",\n      \"evidence\": \"In vitro CDK12 kinase assay with RIP-seq and Ribo-seq; PEST mutagenesis with CUL3 co-IP and ubiquitination assays; polysome profiling in 4E-BP1-depleted pancreatic cancer cells and KO mice\",\n      \"pmids\": [\"30819820\", \"26998719\", \"31672935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CDK12 substrate specificity relative to other CDKs on 4E-BP1 not fully resolved\", \"Full set of 4E-BP1-sensitive mRNAs across tissues not catalogued\", \"CUL3 adaptor subunit mediating 4E-BP1 recognition not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"NMR-resolved mapping of the 4E-BP1–Raptor interface showed that RAIP and TOS motifs bind separate Raptor surfaces, creating avidity-based tethering that orients the flexible central domain toward the mTORC1 active site, providing the structural explanation for hierarchical phosphorylation.\",\n      \"evidence\": \"NMR spectroscopy of 4E-BP1 interaction with Raptor, mutagenesis, and in vitro mTORC1 kinase assays\",\n      \"pmids\": [\"33852892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cryo-EM structure of the full mTORC1–4E-BP1 complex not yet available\", \"How phosphorylation at Thr37/46 repositions the substrate for subsequent kinase events at atomic resolution unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"4E-BP1 was shown to sustain mitochondrial complex III integrity by promoting translation of UQCRC2 and related subunits; its loss in human MSCs elevated ROS and accelerated senescence, rescued by ectopic 4E-BP1 expression.\",\n      \"evidence\": \"CRISPR KO in hMSCs with ectopic rescue, mitochondrial respiration assays, complex III subunit quantification\",\n      \"pmids\": [\"36929036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether 4E-BP1 directly binds mitochondrial mRNAs or acts through general cap-dependent control of nuclear-encoded subunits is unresolved\", \"Relevance to in vivo aging not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full structural basis of the mTORC1–4E-BP1 complex at atomic resolution, the complete inventory of 4E-BP1-sensitive mRNAs across tissues, the identity of the CUL3 adaptor for 4E-BP1 ubiquitination, and whether the centrosomal/spindle functions of 4E-BP1 are translation-independent.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution cryo-EM structure of mTORC1 engaged with full-length 4E-BP1\", \"Translation-independent spindle role not mechanistically separated from local translation\", \"Tissue-specific 4E-BP1-regulated translatomes largely unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 14, 26, 33]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 11, 33, 42]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 7, 11]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [28, 32]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [28, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 3, 8, 26, 38]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 15, 16, 25, 37, 42]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [28, 32, 36, 38]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [14, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [12, 34, 47]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2, 14, 31]}\n    ],\n    \"complexes\": [\n      \"eIF4E–4E-BP1 inhibitory complex\"\n    ],\n    \"partners\": [\n      \"EIF4E\",\n      \"MTOR\",\n      \"RPTOR\",\n      \"PLK1\",\n      \"CDK12\",\n      \"CUL3\",\n      \"PP2A\",\n      \"CDKN1A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}