{"gene":"EIF4G1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"eIF4G recruits Mnk1 to phosphorylate eIF4E: Mnk1 is associated with the eIF4F complex via interaction with the C-terminal region of eIF4G. An eIF4E mutant lacking eIF4G-binding capability shows severely impaired phosphorylation in cells, demonstrating that eIF4G provides a docking site for Mnk1 to phosphorylate eIF4E.","method":"Co-immunoprecipitation, in vitro binding assays, cell-based phosphorylation assays with eIF4E mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and functional mutagenesis in cells, replicated across subsequent studies","pmids":["9878069"],"is_preprint":false},{"year":1995,"finding":"Functional domain mapping of eIF4G by picornaviral proteases: the N-terminal fragment (cpN, containing residues ~319-479) binds eIF4E; the C-terminal fragment (cpC) binds eIF3 (~480-886) and eIF4A (~887-1402). Cleavage separates cap-dependent mRNA recruitment from ribosome attachment/helicase functions.","method":"Proteolytic cleavage with rhinovirus 2A and FMDV L proteases, m7GTP-Sepharose chromatography, ultracentrifugal co-sedimentation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with domain-specific proteolysis and multiple binding assays, widely replicated","pmids":["7665619"],"is_preprint":false},{"year":1998,"finding":"Human eIF4GI contains an N-terminal extension (156 amino acids beyond the previously known sequence) harboring a 29-amino acid PABP-binding site. Full-length eIF4GI (and eIF4GII) binds PABP via RRM1-RRM2 of PABP. An N-terminal fragment including this site inhibits poly(A)-dependent translation in vitro without affecting deadenylated mRNA translation.","method":"5' RACE to extend ORF, co-immunoprecipitation, deletion analysis, in vitro translation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural domain mapping plus functional in vitro translation assay, finding independently confirmed in multiple subsequent studies","pmids":["9857202"],"is_preprint":false},{"year":2003,"finding":"Solution NMR structure of yeast eIF4E/cap–eIF4G(393-490) complex: eIF4G(393-490) undergoes coupled folding upon binding, forming a right-handed helical ring (molecular bracelet) around the eIF4E N-terminus. This cofolding allosterically enhances eIF4E cap association and is required for optimal growth and polysome distributions in vivo.","method":"NMR solution structure, in vitro binding assays, yeast genetics (growth and polysome analysis)","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional validation by mutagenesis and in vivo polysome analysis","pmids":["14675538"],"is_preprint":false},{"year":2007,"finding":"Small-molecule 4EGI-1 binds eIF4E and disrupts eIF4E/eIF4G association, inhibiting cap-dependent translation but not initiation factor-independent translation. Paradoxically, 4EGI-1 enhances 4E-BP1 association with eIF4E both in vitro and in cells.","method":"High-throughput screening, in vitro binding assays, cell-based translation assays, co-immunoprecipitation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical binding assays combined with functional translation assays and cellular validation with multiple orthogonal methods","pmids":["17254965"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of yeast eIF4G middle domain bound to full-length eIF4A at 2.6 Å: eIF4A adopts an extended conformation where eIF4G holds the DEAD-box motifs in a productive conformation, explaining stimulation of eIF4A helicase activity. eIF4G Trp-579 is essential: Trp579Ala mutation decreases eIF4A binding and causes temperature-sensitive growth in yeast.","method":"X-ray crystallography (2.6 Å), site-directed mutagenesis, yeast genetics","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis with in vivo phenotypic validation","pmids":["18606994"],"is_preprint":false},{"year":2005,"finding":"NMR spectroscopy mapping of eIF4G middle domain (aa 745-1003) interaction with eIF4A: the main binding surface is on the C-terminal domain of eIF4A. eIF4G-m forms a 'soft clamp' to stabilize the closed interdomain orientation of eIF4A, explaining cooperative stimulation of eIF4A activity together with RNA and ATP.","method":"NMR spectroscopy, interface mutagenesis (mutations of interface residues abrogated binding), binding assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure determination plus mutagenesis validation of interface","pmids":["16166382"],"is_preprint":false},{"year":2016,"finding":"Crystal structures of human and Drosophila eIF4E–eIF4G complexes reveal that eIF4G auxiliary sequences beyond the canonical 4E-binding motif bind the lateral surface of eIF4E, using a similar mode to that of 4E-BPs, providing a molecular model of competitive displacement.","method":"X-ray crystallography (human and Drosophila eIF4E–eIF4G complexes)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures of two species' complexes with mechanistic interpretation of competitive binding","pmids":["27773676"],"is_preprint":false},{"year":2012,"finding":"Crystal structure at 2.0 Å of poly(A)11·PABP(1-190)·eIF4G(178-203) ternary complex: eIF4G interacts with the RRM2 domain of PABP, and this interaction is allosterically regulated by poly(A) binding to PABP (interdomain allostery). Confirmed by NMR, SAXS, ITC, EMSA, and immunoprecipitation from HeLa extracts.","method":"X-ray crystallography (2.0 Å), NMR, SAXS, ITC, EMSA, co-immunoprecipitation from HeLa cells","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus five orthogonal biophysical/biochemical methods in one study","pmids":["23041282"],"is_preprint":false},{"year":2006,"finding":"Human eIF4G-1 binds eIF3 through the eIF3e (p48/Int-6) subunit. Recombinant FLAG-eIF3e competes with native eIF3 for binding to the eIF3-binding domain of eIF4G-1 in vitro. Addition of FLAG-eIF3e to cell-free translation inhibits cap-dependent translation and causes loss of eIF4G from 40S complexes.","method":"Partial proteolysis of eIF3 followed by mass spectrometry, competitive binding assay, cell-free translation assay, polysome analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — mass spectrometry identification confirmed by competitive binding and functional translation assay, multiple orthogonal methods","pmids":["16766523"],"is_preprint":false},{"year":2013,"finding":"eIF4G binds eIF3 through subunits eIF3c, eIF3d, and eIF3e (not only eIF3e), with two distinct eIF3-binding subdomains in eIF4G. Both subdomains are required for efficient mRNA recruitment and translation. eIF4G binding to eIF3 is independent of eIF4A binding to the eIF4G middle region.","method":"Fluorescence anisotropy, site-specific cross-linking, eIF4G-dependent translation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — cross-linking with multiple positions combined with fluorescence anisotropy and functional translation assay","pmids":["24092755"],"is_preprint":false},{"year":2006,"finding":"mTOR controls the association of eIF3 and eIF4G in response to insulin: insulin increased eIF4G bound to eIF3 up to fivefold; this was blocked by rapamycin and did not require eIF4E binding to eIF4G or eIF3 binding to 40S. mTOR was found to interact directly with eIF3.","method":"Co-immunoprecipitation, pharmacological inhibition (rapamycin), insulin stimulation in cells","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with pharmacological dissection, single lab, multiple conditions tested","pmids":["16541103"],"is_preprint":false},{"year":2000,"finding":"Hsp27 specifically binds eIF4G during heat shock, preventing assembly of the eIF4F cap-initiation complex and trapping eIF4G in insoluble heat shock granules. Purified Hsp27 bound purified eIF4G in vitro, prevented in vitro translation, and promoted eIF4G insolubilization. eIF4E, eIF4A, Mnk1, PABP, eIF4B, and eIF3 were not bound by Hsp27.","method":"Co-immunoprecipitation, in vitro binding with purified proteins, in vitro translation assay, cell fractionation, overexpression studies","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins plus cell-based functional assays and multiple orthogonal methods","pmids":["10859165"],"is_preprint":false},{"year":2000,"finding":"The central region of eIF4GI (aa 613-1090) mediates EMCV IRES-dependent translation; the IRES-binding fragment maps to aa 746-949. Physical association of eIF4GI with eIF4A increases eIF4GI affinity for the EMCV IRES by ~100-fold but not for beta-globin mRNA. eIF4GI mutants defective in eIF4A binding fail to support 48S complex formation on the IRES even if they bind the IRES normally.","method":"Mutational analysis, RNA binding assays in vitro, 48S complex formation assay in vitro","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative in vitro binding plus 48S reconstitution assays with multiple eIF4GI mutants","pmids":["10913184"],"is_preprint":false},{"year":1999,"finding":"The conserved central domain (aa 642-1091) of human eIF4GI, lacking eIF4E- and PABP-binding sites, functions as an autonomous 'ribosome recruitment core' sufficient to drive translation in vivo when tethered to an mRNA via IRP-1 fusion. The C-terminal third is dispensable and may serve as a regulatory domain.","method":"Chimeric protein tethering assay in vivo, deletion analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vivo tethering assay with deletion mapping, single lab","pmids":["10469664"],"is_preprint":false},{"year":2000,"finding":"FMDV 3C protease cleaves both eIF4G and eIF4A within infected cells; the 3C-generated eIF4G cleavage products differ from those produced by the L protease. Demonstrated by transient expression of 3C protease.","method":"Transient expression assay, Western blotting of infected and transfected cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based protease expression with specific cleavage product characterization, single lab","pmids":["10590115"],"is_preprint":false},{"year":1996,"finding":"The eIF4G-eIF4E complex (eIF4F) is the preferred substrate for rhinovirus 2A protease cleavage: eIF4G alone is a poor substrate, but the eIF4G-eIF4E complex is cleaved efficiently. An eIF4G-eIF4E complex (but not eIF4G alone) was required to restore translation of capped mRNA.","method":"In vitro cleavage assay with purified recombinant proteins, in vitro translation reconstitution assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins demonstrating substrate requirement, plus functional translation rescue","pmids":["8970966"],"is_preprint":false},{"year":2002,"finding":"X-ray structure of rotavirus NSP3 C-terminal domain (NSP3-C) in complex with a fragment of eIF4GI: homodimerization of NSP3-C forms two hydrophobic eIF4G-binding pockets at the dimer interface. NSP3 and PABP use analogous eIF4G recognition strategies. Site-directed mutagenesis and ITC validated the binding mechanism.","method":"X-ray crystallography, site-directed mutagenesis, isothermal titration calorimetry","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and quantitative ITC","pmids":["12086624"],"is_preprint":false},{"year":2004,"finding":"eIF4G is required for the pioneer round of translation in mammalian cells: CBP80 and CBP20 independently interact with eIF4GI; cleavage of eIF4G by HIV-2 or poliovirus 2A protease inhibits nonsense-mediated mRNA decay. eIF4GI co-immunopurifies with pre-mRNA and with NMD factors Upf proteins and eIF4AIII.","method":"Co-immunoprecipitation (baculovirus-produced CBP80/CBP20 with eIF4GI), viral protease-mediated cleavage, NMD reporter assay","journal":"Nature structural & molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with functional NMD assay, single lab, multiple orthogonal methods","pmids":["15361857"],"is_preprint":false},{"year":2004,"finding":"The eIF4G central domain (cpC3, aa ~480-886) stimulates RNA-dependent ATPase activity of eIF4A ~40-fold by lowering Km(RNA) 10-fold and raising kcat 4-fold; it interacts with the N-terminal domain of eIF4A. The C-terminal eIF4A-binding domain (cpC2) does not stimulate ATPase activity.","method":"In vitro ATPase assay with purified recombinant domains, RNA cross-linking, kinetic analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative in vitro enzymatic assays with purified proteins and domain mutants","pmids":["15528191"],"is_preprint":false},{"year":2011,"finding":"eIF4G1 mutations p.Ala502Val and p.Arg1205His (associated with familial Parkinson's disease) disrupt eIF4E or eIF3e binding respectively, while wild-type eIF4G1 does not show this disruption. Mutant cells are more vulnerable to reactive oxidative species.","method":"Co-immunoprecipitation, ROS sensitivity assay, genetic segregation analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating disrupted protein interactions for disease variants, single lab, functional cellular assay","pmids":["21907011"],"is_preprint":false},{"year":2011,"finding":"PKCα phosphorylates eIF4G1 at Ser1186. PKCα activation via phorbol esters elicits orchestrated phosphorylation events that modulate eIF4G1 structure and control interaction with the eIF4E kinase Mnk1.","method":"Phosphoproteomics, site-directed mutagenesis, PKCα-specific activation with phorbol esters","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus mutagenesis, single lab","pmids":["21576361"],"is_preprint":false},{"year":2010,"finding":"MAPK-mediated phosphorylation of the Mnk1 active site controls eIF4G binding: the C-terminal domain of Mnk1 restricts its eIF4G interaction. Mnk1 autoregulates its interaction with eIF4G, releasing itself after phosphorylating its substrate (eIF4E). This was demonstrated using a splice variant, kinase-dead mutant, and small-molecule Mnk1 inhibitor.","method":"Co-immunoprecipitation, splice variant analysis, kinase-dead mutant, Mnk1 inhibitor","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with multiple genetic and pharmacological tools, single lab","pmids":["20823271"],"is_preprint":false},{"year":2013,"finding":"Cdk1:cyclin B phosphorylates eIF4G1 at Ser1232 during mitosis. This phosphorylation strongly enhances eIF4A interaction with HEAT domain 2 of eIF4G but decreases association of the eIF4G/eIF4A complex with RNA, implicating this event in the mitotic translation initiation shift.","method":"Phosphoproteomics, in vitro phosphorylation with recombinant Cdk1:cyclin B, kinase inhibition assays, kinase depletion-reconstitution, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphorylation with recombinant kinase plus multiple orthogonal cellular assays in one study","pmids":["24248602"],"is_preprint":false},{"year":2005,"finding":"Pak2 binds to and phosphorylates eIF4G at Ser896, inhibiting association of eIF4E with the m7GTP cap and reducing translation initiation. Pak2 and eIF4E compete for binding to this site on eIF4G. The S896D phosphomimetic mutant inhibits translation while S896A does not.","method":"In vitro kinase assay, eIF4G-depleted reticulocyte lysate reconstitution, eIF4G Ser896 mutants, RNA interference","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay combined with reconstitution in depleted lysate and site-specific mutagenesis","pmids":["16281055"],"is_preprint":false},{"year":2008,"finding":"Neural RNA-binding protein Musashi1 (Msi1) inhibits translation initiation by competing with eIF4G for binding to PABP. This competition prevents assembly of the 80S ribosome (but not the 48S complex). Deletion of the PABP-interacting domain in Msi1 abolishes its translational repression function.","method":"Identification of PABP as Msi1-binding partner, competitive binding assay with eIF4G, ribosome assembly assay, deletion mutant analysis, stress granule localization","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying competition mechanism, functional deletion analysis, single lab with multiple methods","pmids":["18490513"],"is_preprint":false},{"year":2000,"finding":"eIF4G-PABP interaction is critical for translational control in Xenopus oocytes: expression of an eIF4GI mutant defective in PABP binding reduces translation of polyadenylated mRNA and dramatically inhibits progesterone-induced oocyte maturation.","method":"Microinjection of mutant eIF4GI into Xenopus oocytes, in vivo translation assay, maturation assay","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutant in an in vivo developmental model, single lab","pmids":["10996799"],"is_preprint":false},{"year":2004,"finding":"Adenovirus 100K protein possesses a selective binding element for the tripartite leader mRNA, forms a complex with eIF4G and PABP, and promotes ribosome shunting. The ability of 100K to bind both the tripartite leader and eIF4G is critical for ribosome shunting. 100K competitively displaces Mnk1 from eIF4G and blocks eIF4E phosphorylation.","method":"Co-immunoprecipitation, polysome analysis, mutational analysis, in vitro translation assay","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and mutagenesis with functional translation assay, single lab","pmids":["15314025"],"is_preprint":false},{"year":2004,"finding":"Adenovirus 100K protein displaces Mnk1 from eIF4G via a shared eIF4G-binding motif located in the N-terminal 66 aa of 100K. 100K binds eIF4G more strongly than Mnk1 and its binding is RNA-independent, unlike Mnk1 whose eIF4G binding is RNA-dependent.","method":"Co-immunoprecipitation, competitive binding assay, domain mapping, in vitro translation assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and competition binding with domain-mapped interactions, single lab","pmids":["15220445"],"is_preprint":false},{"year":1997,"finding":"Yeast eIF4G homologs (Tif4631p and Tif4632p) share a conserved Pab1p-binding site required for poly(A)-tail-stimulated translation of uncapped mRNAs in vitro and for synergistic cap/poly(A) stimulation. The region encompassing the Pab1p-binding site on eIF4G1 becomes essential for growth when the eIF4E-binding site is mutated.","method":"In vitro translation assay, deletion/mutation analysis, yeast genetic epistasis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro functional assay combined with yeast genetic epistasis analysis","pmids":["9256432"],"is_preprint":false},{"year":2012,"finding":"Scd6 (yeast) represses translation by binding the eIF4G subunit of eIF4F via its RGG domain, forming a translation-repressed mRNP. Several other RGG-domain proteins (Npl3, Sbp1) also directly bind eIF4G and repress translation via their RGG motifs.","method":"Co-purification, direct binding assay, in vivo translation repression assay","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-purification with functional translation repression assay, domain-specific (RGG), single lab","pmids":["22284680"],"is_preprint":false},{"year":2003,"finding":"Yeast eIF4G1 binds single-stranded RNA at three distinct sites: N-terminal (aa 1-82), middle (aa 492-539, RS-rich), and C-terminal (aa 883-952, RS-rich). Full-length eIF4G1 has ~100-fold higher RNA affinity than individual sites alone. Deletion of any two sites strongly impairs in vitro translation and yeast cell growth; arginine-to-alanine mutations in the middle RS site abolish its RNA-binding activity.","method":"RNA binding assay, alanine mutagenesis, in vitro translation, yeast growth assay","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple deletion and mutagenesis experiments with in vitro and in vivo validation, single lab","pmids":["12810920"],"is_preprint":false},{"year":2020,"finding":"eIF4G has intrinsic G-quadruplex (G4) binding activity that is required for tiRNA-mediated translation repression. Targeting eIF4G with G4-forming tiRNAs impairs 40S ribosome scanning on mRNAs and leads to formation of eIF2α-independent stress granules.","method":"Direct binding assay (G4-eIF4G), ribosome scanning assay, stress granule imaging, tiRNA functional assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding plus functional assays, single lab, novel activity","pmids":["32374873"],"is_preprint":false},{"year":2020,"finding":"Neuronal microexons in eIF4G1 (and eIF4G3) overlapping prion-like domains are activity-dependent in their splicing and frequently disrupted in autism. CRISPR-Cas9 deletion of the eIF4G1 microexon selectively upregulates synaptic proteins, causes ribosome stalling, and promotes coalescence of cytoplasmic granule components including FMRP. Mice lacking the Eif4g1 microexon show social behavior, learning, and memory deficits with altered hippocampal synaptic plasticity.","method":"CRISPR-Cas9 deletion, ribosome profiling, RNA-seq, mouse behavioral assays, synaptic plasticity electrophysiology, granule imaging","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal molecular and in vivo methods in one study demonstrating mechanism of translational brake via microexon","pmids":["31999954"],"is_preprint":false},{"year":2012,"finding":"eIF4G1 upregulation in breast cancer cells selectively increases translation of mRNAs involved in survival and DNA damage response following ionizing radiation. Reduced eIF4G1 (but not eIF4G2) sensitizes cells to DNA damage and delays resolution of DNA damage foci with little effect on overall protein synthesis, establishing a specific role for eIF4G1 in specialized translation.","method":"siRNA knockdown, polysome profiling, translation reporter assays, DNA damage foci assay, apoptosis and autophagy assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with specific phenotypic readouts and translational profiling, single lab","pmids":["23112151"],"is_preprint":false},{"year":2003,"finding":"Yeast eIF4G2 HEAT domain and flanking residues are required for optimal interaction with AUG recognition factors eIF5 and eIF1. eIF1 binds simultaneously to eIF4G and eIF3c in vitro. HEAT domain mutations that impair eIF4G–eIF1/eIF5 interaction enhance translation from a non-AUG codon, indicating a role in start-codon fidelity.","method":"In vitro binding assay, genetic co-overexpression suppression, start-codon fidelity reporter","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding combined with yeast genetic epistasis, single lab","pmids":["12861028"],"is_preprint":false},{"year":2018,"finding":"eIF4G1 exists in two mutually exclusive complexes: one with eIF4E and one with eIF1. The eIF1-eIF4G1 interaction promotes leaky scanning and prevents cap-proximal initiation, while eIF4E-eIF4G1 antagonizes scanning and is required for TISU-dependent translation. The eIF1-binding site on eIF4G1 is also indirectly contacted by eIF4E.","method":"Co-immunoprecipitation, eIF1 binding-deficient mutant, luciferase translation reporters, domain mapping","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutant-based dissection of two complexes with functional translation assays, single lab","pmids":["29987188"],"is_preprint":false},{"year":2019,"finding":"OGT O-GlcNAc-modifies eIF4G1 at Ser-61, and this modification is critical for eIF4G1 protein stability. Loss of OGT in β-cells reduces eIF4G1 stability, leading to decreased CPE levels and impaired proinsulin processing. Overexpression of eIF4G1 in βOGTKO islets fully reverses hyperproinsulinemia.","method":"Click O-GlcNAc labeling, site-directed mutagenesis (Ser-61), immunoblotting, islet overexpression rescue experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific PTM mapping by mutagenesis plus functional rescue, single lab","pmids":["31300553"],"is_preprint":false},{"year":2016,"finding":"Arginine methylation of the Scd6 RGG motif by the methyltransferase Hmt1 promotes Scd6 binding to eIF4G1 and augments translation repression activity. An arginine methylation-defective Scd6 mutant fails to bind eIF4G1 efficiently and is defective in stress granule formation.","method":"In vivo methylation assay, pulldown binding assay with eIF4G1, live-cell imaging, growth rescue assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay combined with live imaging and methylation mapping, single lab","pmids":["27613419"],"is_preprint":false},{"year":2014,"finding":"VPS35 and EIF4G1 interact genetically in yeast and converge on α-synuclein pathobiology. EIF4G1 upregulation causes protein misfolding defects; expression of sortilin downstream of VPS35 rescues these defects. These genetic interactions are conserved in worm and mouse neurons.","method":"Yeast genetic interaction screen, overexpression/suppression experiments, transgenic mouse model, neuronal models","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in multiple model organisms, single lab","pmids":["25533483"],"is_preprint":false},{"year":2002,"finding":"CBP80 (cap-binding protein 80) and eIF4G share a common origin and similar HEAT domain organization. A structural model based on the CBP80-CBP20 crystal structure suggests how the domains of eIF4G are oriented and could interact with translation factors.","method":"Sequence and structural analysis, domain homology modeling based on CBP80-CBP20 crystal structure","journal":"Biochemistry","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/structural modeling without experimental validation of eIF4G-specific interactions","pmids":["16156639"],"is_preprint":false},{"year":2001,"finding":"In human cells, eIF4G is associated with eIF4AI or eIF4AII but not both simultaneously, establishing a 1:1 stoichiometry rather than 1:2. Tagged eIF4A complexes with eIF4G contain no endogenous eIF4A, confirming that each eIF4G binds only one molecule of eIF4A despite having two binding sites.","method":"Co-immunoprecipitation of tagged eIF4A isoforms in HEK cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with tagged proteins demonstrating stoichiometry, single lab","pmids":["11408474"],"is_preprint":false},{"year":2004,"finding":"Leucine stimulates eIF4E·eIF4G assembly and eIF4G(Ser1108) phosphorylation in rat skeletal muscle through a signaling pathway independent of mTOR (unaffected by rapamycin or PI3K inhibition).","method":"Hindlimb perfusion model, co-immunoprecipitation (eIF4E IP), Western blotting for phospho-eIF4G(Ser1108)","journal":"The Journal of nutrition","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — physiological model with pharmacological dissection, single lab","pmids":["15226457"],"is_preprint":false},{"year":1998,"finding":"Fas/CD95 receptor activation in Jurkat cells induces caspase-dependent cleavage of eIF4G, inhibition of total protein synthesis, and cell death. Caspase inhibitors zVAD.FMK and zDEVD.FMK prevent both eIF4G cleavage and cell death. Signaling through p38 MAP kinase is not required for Fas-induced eIF4G cleavage.","method":"Fas receptor activation, caspase inhibitor treatment, Western blot for eIF4G cleavage, protein synthesis measurement","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of caspase pathway with functional translation readout, single lab","pmids":["9821956"],"is_preprint":false}],"current_model":"EIF4G1 is a large modular scaffold protein at the center of the eIF4F translation initiation complex that coordinates cap-dependent and cap-independent translation: its N-terminal region binds PABP (via a 29-aa site) to support poly(A)-stimulated translation; the middle HEAT domain interacts with eIF4E (whose binding is allosterically enhanced upon cofolding), recruits and stimulates eIF4A helicase activity by stabilizing its closed interdomain conformation, binds eIF3 (primarily through eIF3c/d/e subunits) to bridge the mRNA cap-binding complex to the 40S ribosomal subunit, and provides a docking site for Mnk1 to phosphorylate eIF4E at Ser209; the complex is regulated by multiple post-translational modifications including PKCα-mediated phosphorylation at Ser1186 (controlling Mnk1 interaction), Pak2-mediated phosphorylation at Ser896 (inhibiting eIF4E association), Cdk1:cyclin B phosphorylation at Ser1232 during mitosis (enhancing eIF4A-HEAT2 interaction while reducing eIF4A-RNA association), and OGlcNAcylation at Ser-61 (controlling protein stability); neuronal alternative splicing of a microexon in the prion-like domain acts as a translational brake by promoting ribosome stalling and FMRP-containing granule formation; disease-associated PD mutations (Ala502Val, Arg1205His) disrupt eIF4E or eIF3e binding respectively and increase cellular sensitivity to oxidative stress."},"narrative":{"mechanistic_narrative":"EIF4G1 is a large modular scaffold that organizes the eIF4F cap-binding complex and bridges mRNA to the 40S ribosome to drive both cap-dependent and cap-independent translation initiation [PMID:7665619, PMID:10469664]. Domain dissection by picornaviral proteases established its tripartite architecture: an N-terminal region binding eIF4E, a central region binding eIF3 and eIF4A, and a C-terminal regulatory third [PMID:7665619], with a conserved central 'ribosome recruitment core' (aa ~642-1091) sufficient to drive translation when tethered to mRNA [PMID:10469664]. Through coupled folding, EIF4G1 wraps around the eIF4E N-terminus as a helical 'molecular bracelet' that allosterically enhances cap binding [PMID:14675538], and auxiliary sequences beyond the canonical 4E-binding motif engage the lateral eIF4E surface in a mode that explains competitive displacement by 4E-BPs [PMID:27773676]. The central HEAT domain clamps eIF4A in a productive closed conformation, stimulating its RNA-dependent ATPase and helicase activity ~40-fold [PMID:18606994, PMID:16166382, PMID:15528191], with one eIF4A bound per eIF4G despite two contact sites [PMID:11408474]. An extended N-terminal segment binds PABP via the RRM2 domain in a poly(A)-regulated manner, coupling the poly(A) tail to translation [PMID:9857202, PMID:23041282], while distinct central subdomains contact eIF3 through the eIF3c/d/e subunits to recruit the 40S subunit [PMID:16766523, PMID:24092755]. EIF4G1 additionally provides the docking site that recruits Mnk1 to phosphorylate eIF4E [PMID:7665619] and partitions between mutually exclusive eIF4E and eIF1 complexes that control scanning behavior and start-codon selection [PMID:29987188]. Its activity is gated by phosphorylation — Pak2 at Ser896 blocking eIF4E association [PMID:16281055], Cdk1:cyclin B at Ser1232 reprogramming eIF4A and RNA contacts during mitosis [PMID:24248602], and PKCα at Ser1186 modulating Mnk1 interaction [PMID:21576361] — and by O-GlcNAcylation at Ser-61 that controls protein stability [PMID:31300553]. EIF4G1 is a hub for translational repression and viral hijacking, being sequestered by Hsp27 during heat shock [PMID:10859165], targeted by repressors such as Musashi1 and Scd6 that compete for PABP or eIF4G [PMID:18490513, PMID:22284680], used by picornaviral, rotaviral, and adenoviral factors to redirect initiation [PMID:10913184, PMID:12086624, PMID:15314025], and cleaved by caspases during Fas-induced apoptosis [PMID:9821956]. Neuronal microexon splicing in its prion-like domain acts as a translational brake promoting ribosome stalling and FMRP granule formation [PMID:31999954], and disease-associated familial Parkinson's mutations (Ala502Val, Arg1205His) disrupt eIF4E or eIF3e binding and increase oxidative-stress sensitivity [PMID:21907011].","teleology":[{"year":1995,"claim":"Established the modular blueprint of eIF4G by mapping which factors bind which region, separating cap-dependent mRNA recruitment from ribosome attachment and helicase functions.","evidence":"Domain-specific proteolysis with rhinovirus 2A and FMDV L proteases plus binding assays in vitro","pmids":["7665619"],"confidence":"High","gaps":["Boundaries are approximate","Did not resolve PABP-binding N-terminal extension or PTM control"]},{"year":1998,"claim":"Revealed an N-terminal PABP-binding site, connecting the poly(A) tail to translation initiation through eIF4G.","evidence":"5' RACE ORF extension, co-IP, deletion analysis, and in vitro translation in human/yeast systems","pmids":["9857202","9256432"],"confidence":"High","gaps":["Structural basis of PABP contact not resolved here","Poly(A) allostery not yet defined"]},{"year":1999,"claim":"Showed eIF4G is the recruitment platform that brings Mnk1 to phosphorylate eIF4E, and defined a central core sufficient for ribosome recruitment.","evidence":"Co-IP, eIF4E-binding mutants, cell phosphorylation assays, and in vivo tethering of the central domain","pmids":["9878069","10469664"],"confidence":"High","gaps":["Mnk1 release dynamics undefined","C-terminal regulatory function not specified"]},{"year":2000,"claim":"Demonstrated eIF4G's central region directs cap-independent (IRES) translation and that eIF4A binding boosts IRES affinity, while heat shock and viral proteases can sequester or destroy eIF4G to shut translation down.","evidence":"In vitro 48S reconstitution on EMCV IRES, purified-protein Hsp27 binding, and FMDV 3C protease cleavage in cells","pmids":["10913184","10859165","10590115","10996799"],"confidence":"High","gaps":["IRES recruitment mechanism partly inferred","Hsp27 binding site on eIF4G not mapped"]},{"year":2003,"claim":"Resolved that eIF4G undergoes coupled folding around eIF4E as a molecular bracelet that allosterically enhances cap binding, and identified intrinsic RNA-binding sites in eIF4G.","evidence":"NMR solution structure of eIF4E/eIF4G complex with yeast polysome validation; RNA-binding/mutagenesis assays","pmids":["14675538","12810920","12861028"],"confidence":"High","gaps":["Allosteric coupling to downstream steps not fully traced","Start-codon fidelity role shown in yeast only"]},{"year":2005,"claim":"Defined the structural mechanism by which eIF4G stimulates eIF4A — a soft clamp stabilizing the closed helicase conformation — and identified Pak2 as a kinase that inhibits eIF4E association.","evidence":"NMR mapping of the eIF4G middle domain on eIF4A; in vitro kinase assay and Ser896 mutants in depleted lysate","pmids":["16166382","16281055","15528191"],"confidence":"High","gaps":["Cooperativity with RNA/ATP inferred from binding states","Pak2 signaling context limited"]},{"year":2006,"claim":"Identified the eIF3 subunit(s) through which eIF4G recruits the 40S subunit and placed this interaction under mTOR/insulin control.","evidence":"Proteolysis-MS, competitive binding, cell-free translation, and insulin/rapamycin co-IP","pmids":["16766523","16541103"],"confidence":"Medium","gaps":["mTOR-eIF3-eIF4G link single lab","eIF3e-only model later revised"]},{"year":2008,"claim":"Provided atomic detail of the eIF4G-eIF4A interface, pinpointing essential residues (Trp579) for helicase activation, and described a small-molecule disruptor of eIF4E/eIF4G.","evidence":"Crystal structure of eIF4G-m/eIF4A with yeast mutagenesis; 4EGI-1 binding/translation assays","pmids":["18606994","17254965"],"confidence":"High","gaps":["Human structural confirmation pending at this stage"]},{"year":2012,"claim":"Established the structural and allosteric basis of poly(A)-regulated PABP recognition and showed eIF4G1 selectively supports survival/DNA-damage-response translation in cancer.","evidence":"2.0 Å crystal structure with NMR/SAXS/ITC/EMSA; siRNA knockdown with polysome profiling and DNA damage foci assays","pmids":["23041282","23112151"],"confidence":"Medium","gaps":["mRNA selectivity determinants undefined","Cancer role from single lab"]},{"year":2013,"claim":"Refined the eIF3-binding model to multiple subunits/subdomains and identified mitotic Cdk1:cyclin B phosphorylation at Ser1232 that reprograms eIF4A and RNA contacts.","evidence":"Fluorescence anisotropy and cross-linking for eIF3 contacts; in vitro Cdk1 phosphorylation with cellular reconstitution","pmids":["24092755","24248602"],"confidence":"High","gaps":["Functional consequence of mitotic shift on specific mRNAs not detailed"]},{"year":2016,"claim":"Clarified the structural mechanism of 4E-BP-like competitive displacement at eIF4E and linked Scd6 arginine methylation to enhanced eIF4G1 repression.","evidence":"Crystal structures of human/Drosophila eIF4E-eIF4G; methylation and pulldown assays in yeast","pmids":["27773676","27613419"],"confidence":"High","gaps":["Repressor regulation characterized in yeast only"]},{"year":2018,"claim":"Defined two mutually exclusive eIF4G1 complexes (eIF4E vs eIF1) that determine scanning behavior and start-codon selection.","evidence":"Co-IP, eIF1-binding-deficient mutants, and luciferase reporters","pmids":["29987188"],"confidence":"Medium","gaps":["Single lab","Switch between complexes mechanistically open"]},{"year":2020,"claim":"Uncovered intrinsic G-quadruplex binding by eIF4G mediating tiRNA repression, and showed a neuronal microexon in the prion-like domain acts as a translational brake driving stalling and FMRP granules.","evidence":"Direct G4 binding/scanning assays; CRISPR microexon deletion with ribosome profiling and mouse behavioral/synaptic assays","pmids":["32374873","31999954"],"confidence":"Medium","gaps":["G4-binding region on eIF4G not mapped","Microexon mechanism of stalling partly inferred"]},{"year":null,"claim":"How the many PTMs, alternative complexes, and condensate-promoting domains are integrated to select specific mRNAs for translation in distinct physiological and disease states remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking PTM combinations to mRNA-specific output","Mechanism of Parkinson's-associated dysfunction in vivo unresolved","Prion-like domain condensate regulation incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,9,10,14]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[13,31,32]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6,19,3]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[14,36,33]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12,33,32]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[9,14,10]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,5,9]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[18,13]}],"complexes":["eIF4F"],"partners":["EIF4E","EIF4A1","EIF3E","PABPC1","MKNK1","EIF1","EIF3C","HSPB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q04637","full_name":"Eukaryotic translation initiation factor 4 gamma 1","aliases":["p220"],"length_aa":1599,"mass_kda":175.5,"function":"Component of the protein complex eIF4F, which is involved in the recognition of the mRNA cap, ATP-dependent unwinding of 5'-terminal secondary structure and recruitment of mRNA to the ribosome (PubMed:29987188). Exists in two complexes, either with EIF1 or with EIF4E (mutually exclusive) (PubMed:29987188). Together with EIF1, is required for leaky scanning, in particular for avoiding cap-proximal start codon (PubMed:29987188). Together with EIF4E, antagonizes the scanning promoted by EIF1-EIF4G1 and locates the start codon (through a TISU element) without scanning (PubMed:29987188). As a member of the eIF4F complex, required for endoplasmic reticulum stress-induced ATF4 mRNA translation (PubMed:29062139)","subcellular_location":"Cytoplasm; Nucleus; Cytoplasm, Stress granule","url":"https://www.uniprot.org/uniprotkb/Q04637/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EIF4G1","classification":"Common Essential","n_dependent_lines":1032,"n_total_lines":1208,"dependency_fraction":0.8543046357615894},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EIF3B","stoichiometry":10.0},{"gene":"RPS16","stoichiometry":4.0},{"gene":"ATG13","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CDC26","stoichiometry":0.2},{"gene":"CEP350","stoichiometry":0.2},{"gene":"DDX6","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2},{"gene":"EIF5","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/EIF4G1","total_profiled":1310},"omim":[{"mim_id":"620759","title":"POLG ALTERNATIVE READING FRAME; POLGARF","url":"https://www.omim.org/entry/620759"},{"mim_id":"619901","title":"EUKARYOTIC TRANSLATION INITIATION FACTOR 1; EIF1","url":"https://www.omim.org/entry/619901"},{"mim_id":"619537","title":"ANGEL HOMOLOG 1; ANGEL1","url":"https://www.omim.org/entry/619537"},{"mim_id":"619239","title":"NEURODEVELOPMENTAL DISORDER WITH OR WITHOUT AUTISM OR SEIZURES; NEDAUS","url":"https://www.omim.org/entry/619239"},{"mim_id":"618206","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 7B; ZC3H7B","url":"https://www.omim.org/entry/618206"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EIF4G1"},"hgnc":{"alias_symbol":["p220","PARK18"],"prev_symbol":["EIF4G","EIF4F"]},"alphafold":{"accession":"Q04637","domains":[{"cath_id":"1.25.40.180","chopping":"755-990","consensus_level":"medium","plddt":80.6648,"start":755,"end":990},{"cath_id":"1.25.40.180","chopping":"1238-1428","consensus_level":"medium","plddt":90.7835,"start":1238,"end":1428},{"cath_id":"1.25.40.180","chopping":"1440-1599","consensus_level":"medium","plddt":87.8022,"start":1440,"end":1599}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04637","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q04637-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q04637-F1-predicted_aligned_error_v6.png","plddt_mean":54.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EIF4G1","jax_strain_url":"https://www.jax.org/strain/search?query=EIF4G1"},"sequence":{"accession":"Q04637","fasta_url":"https://rest.uniprot.org/uniprotkb/Q04637.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q04637/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04637"}},"corpus_meta":[{"pmid":"9878069","id":"PMC_9878069","title":"Human eukaryotic translation initiation factor 4G (eIF4G) recruits mnk1 to phosphorylate eIF4E.","date":"1999","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9878069","citation_count":539,"is_preprint":false},{"pmid":"7665619","id":"PMC_7665619","title":"Mapping of functional domains in eukaryotic protein synthesis initiation factor 4G (eIF4G) with picornaviral proteases. 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An eIF4E mutant lacking eIF4G-binding capability shows severely impaired phosphorylation in cells, demonstrating that eIF4G provides a docking site for Mnk1 to phosphorylate eIF4E.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, cell-based phosphorylation assays with eIF4E mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and functional mutagenesis in cells, replicated across subsequent studies\",\n      \"pmids\": [\"9878069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Functional domain mapping of eIF4G by picornaviral proteases: the N-terminal fragment (cpN, containing residues ~319-479) binds eIF4E; the C-terminal fragment (cpC) binds eIF3 (~480-886) and eIF4A (~887-1402). Cleavage separates cap-dependent mRNA recruitment from ribosome attachment/helicase functions.\",\n      \"method\": \"Proteolytic cleavage with rhinovirus 2A and FMDV L proteases, m7GTP-Sepharose chromatography, ultracentrifugal co-sedimentation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with domain-specific proteolysis and multiple binding assays, widely replicated\",\n      \"pmids\": [\"7665619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human eIF4GI contains an N-terminal extension (156 amino acids beyond the previously known sequence) harboring a 29-amino acid PABP-binding site. Full-length eIF4GI (and eIF4GII) binds PABP via RRM1-RRM2 of PABP. An N-terminal fragment including this site inhibits poly(A)-dependent translation in vitro without affecting deadenylated mRNA translation.\",\n      \"method\": \"5' RACE to extend ORF, co-immunoprecipitation, deletion analysis, in vitro translation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural domain mapping plus functional in vitro translation assay, finding independently confirmed in multiple subsequent studies\",\n      \"pmids\": [\"9857202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Solution NMR structure of yeast eIF4E/cap–eIF4G(393-490) complex: eIF4G(393-490) undergoes coupled folding upon binding, forming a right-handed helical ring (molecular bracelet) around the eIF4E N-terminus. This cofolding allosterically enhances eIF4E cap association and is required for optimal growth and polysome distributions in vivo.\",\n      \"method\": \"NMR solution structure, in vitro binding assays, yeast genetics (growth and polysome analysis)\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional validation by mutagenesis and in vivo polysome analysis\",\n      \"pmids\": [\"14675538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Small-molecule 4EGI-1 binds eIF4E and disrupts eIF4E/eIF4G association, inhibiting cap-dependent translation but not initiation factor-independent translation. Paradoxically, 4EGI-1 enhances 4E-BP1 association with eIF4E both in vitro and in cells.\",\n      \"method\": \"High-throughput screening, in vitro binding assays, cell-based translation assays, co-immunoprecipitation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical binding assays combined with functional translation assays and cellular validation with multiple orthogonal methods\",\n      \"pmids\": [\"17254965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of yeast eIF4G middle domain bound to full-length eIF4A at 2.6 Å: eIF4A adopts an extended conformation where eIF4G holds the DEAD-box motifs in a productive conformation, explaining stimulation of eIF4A helicase activity. eIF4G Trp-579 is essential: Trp579Ala mutation decreases eIF4A binding and causes temperature-sensitive growth in yeast.\",\n      \"method\": \"X-ray crystallography (2.6 Å), site-directed mutagenesis, yeast genetics\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis with in vivo phenotypic validation\",\n      \"pmids\": [\"18606994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NMR spectroscopy mapping of eIF4G middle domain (aa 745-1003) interaction with eIF4A: the main binding surface is on the C-terminal domain of eIF4A. eIF4G-m forms a 'soft clamp' to stabilize the closed interdomain orientation of eIF4A, explaining cooperative stimulation of eIF4A activity together with RNA and ATP.\",\n      \"method\": \"NMR spectroscopy, interface mutagenesis (mutations of interface residues abrogated binding), binding assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure determination plus mutagenesis validation of interface\",\n      \"pmids\": [\"16166382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structures of human and Drosophila eIF4E–eIF4G complexes reveal that eIF4G auxiliary sequences beyond the canonical 4E-binding motif bind the lateral surface of eIF4E, using a similar mode to that of 4E-BPs, providing a molecular model of competitive displacement.\",\n      \"method\": \"X-ray crystallography (human and Drosophila eIF4E–eIF4G complexes)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures of two species' complexes with mechanistic interpretation of competitive binding\",\n      \"pmids\": [\"27773676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure at 2.0 Å of poly(A)11·PABP(1-190)·eIF4G(178-203) ternary complex: eIF4G interacts with the RRM2 domain of PABP, and this interaction is allosterically regulated by poly(A) binding to PABP (interdomain allostery). Confirmed by NMR, SAXS, ITC, EMSA, and immunoprecipitation from HeLa extracts.\",\n      \"method\": \"X-ray crystallography (2.0 Å), NMR, SAXS, ITC, EMSA, co-immunoprecipitation from HeLa cells\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus five orthogonal biophysical/biochemical methods in one study\",\n      \"pmids\": [\"23041282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human eIF4G-1 binds eIF3 through the eIF3e (p48/Int-6) subunit. Recombinant FLAG-eIF3e competes with native eIF3 for binding to the eIF3-binding domain of eIF4G-1 in vitro. Addition of FLAG-eIF3e to cell-free translation inhibits cap-dependent translation and causes loss of eIF4G from 40S complexes.\",\n      \"method\": \"Partial proteolysis of eIF3 followed by mass spectrometry, competitive binding assay, cell-free translation assay, polysome analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mass spectrometry identification confirmed by competitive binding and functional translation assay, multiple orthogonal methods\",\n      \"pmids\": [\"16766523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"eIF4G binds eIF3 through subunits eIF3c, eIF3d, and eIF3e (not only eIF3e), with two distinct eIF3-binding subdomains in eIF4G. Both subdomains are required for efficient mRNA recruitment and translation. eIF4G binding to eIF3 is independent of eIF4A binding to the eIF4G middle region.\",\n      \"method\": \"Fluorescence anisotropy, site-specific cross-linking, eIF4G-dependent translation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cross-linking with multiple positions combined with fluorescence anisotropy and functional translation assay\",\n      \"pmids\": [\"24092755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"mTOR controls the association of eIF3 and eIF4G in response to insulin: insulin increased eIF4G bound to eIF3 up to fivefold; this was blocked by rapamycin and did not require eIF4E binding to eIF4G or eIF3 binding to 40S. mTOR was found to interact directly with eIF3.\",\n      \"method\": \"Co-immunoprecipitation, pharmacological inhibition (rapamycin), insulin stimulation in cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with pharmacological dissection, single lab, multiple conditions tested\",\n      \"pmids\": [\"16541103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Hsp27 specifically binds eIF4G during heat shock, preventing assembly of the eIF4F cap-initiation complex and trapping eIF4G in insoluble heat shock granules. Purified Hsp27 bound purified eIF4G in vitro, prevented in vitro translation, and promoted eIF4G insolubilization. eIF4E, eIF4A, Mnk1, PABP, eIF4B, and eIF3 were not bound by Hsp27.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding with purified proteins, in vitro translation assay, cell fractionation, overexpression studies\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins plus cell-based functional assays and multiple orthogonal methods\",\n      \"pmids\": [\"10859165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The central region of eIF4GI (aa 613-1090) mediates EMCV IRES-dependent translation; the IRES-binding fragment maps to aa 746-949. Physical association of eIF4GI with eIF4A increases eIF4GI affinity for the EMCV IRES by ~100-fold but not for beta-globin mRNA. eIF4GI mutants defective in eIF4A binding fail to support 48S complex formation on the IRES even if they bind the IRES normally.\",\n      \"method\": \"Mutational analysis, RNA binding assays in vitro, 48S complex formation assay in vitro\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative in vitro binding plus 48S reconstitution assays with multiple eIF4GI mutants\",\n      \"pmids\": [\"10913184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The conserved central domain (aa 642-1091) of human eIF4GI, lacking eIF4E- and PABP-binding sites, functions as an autonomous 'ribosome recruitment core' sufficient to drive translation in vivo when tethered to an mRNA via IRP-1 fusion. The C-terminal third is dispensable and may serve as a regulatory domain.\",\n      \"method\": \"Chimeric protein tethering assay in vivo, deletion analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vivo tethering assay with deletion mapping, single lab\",\n      \"pmids\": [\"10469664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FMDV 3C protease cleaves both eIF4G and eIF4A within infected cells; the 3C-generated eIF4G cleavage products differ from those produced by the L protease. Demonstrated by transient expression of 3C protease.\",\n      \"method\": \"Transient expression assay, Western blotting of infected and transfected cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based protease expression with specific cleavage product characterization, single lab\",\n      \"pmids\": [\"10590115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The eIF4G-eIF4E complex (eIF4F) is the preferred substrate for rhinovirus 2A protease cleavage: eIF4G alone is a poor substrate, but the eIF4G-eIF4E complex is cleaved efficiently. An eIF4G-eIF4E complex (but not eIF4G alone) was required to restore translation of capped mRNA.\",\n      \"method\": \"In vitro cleavage assay with purified recombinant proteins, in vitro translation reconstitution assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins demonstrating substrate requirement, plus functional translation rescue\",\n      \"pmids\": [\"8970966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"X-ray structure of rotavirus NSP3 C-terminal domain (NSP3-C) in complex with a fragment of eIF4GI: homodimerization of NSP3-C forms two hydrophobic eIF4G-binding pockets at the dimer interface. NSP3 and PABP use analogous eIF4G recognition strategies. Site-directed mutagenesis and ITC validated the binding mechanism.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, isothermal titration calorimetry\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and quantitative ITC\",\n      \"pmids\": [\"12086624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"eIF4G is required for the pioneer round of translation in mammalian cells: CBP80 and CBP20 independently interact with eIF4GI; cleavage of eIF4G by HIV-2 or poliovirus 2A protease inhibits nonsense-mediated mRNA decay. eIF4GI co-immunopurifies with pre-mRNA and with NMD factors Upf proteins and eIF4AIII.\",\n      \"method\": \"Co-immunoprecipitation (baculovirus-produced CBP80/CBP20 with eIF4GI), viral protease-mediated cleavage, NMD reporter assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with functional NMD assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15361857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The eIF4G central domain (cpC3, aa ~480-886) stimulates RNA-dependent ATPase activity of eIF4A ~40-fold by lowering Km(RNA) 10-fold and raising kcat 4-fold; it interacts with the N-terminal domain of eIF4A. The C-terminal eIF4A-binding domain (cpC2) does not stimulate ATPase activity.\",\n      \"method\": \"In vitro ATPase assay with purified recombinant domains, RNA cross-linking, kinetic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative in vitro enzymatic assays with purified proteins and domain mutants\",\n      \"pmids\": [\"15528191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"eIF4G1 mutations p.Ala502Val and p.Arg1205His (associated with familial Parkinson's disease) disrupt eIF4E or eIF3e binding respectively, while wild-type eIF4G1 does not show this disruption. Mutant cells are more vulnerable to reactive oxidative species.\",\n      \"method\": \"Co-immunoprecipitation, ROS sensitivity assay, genetic segregation analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating disrupted protein interactions for disease variants, single lab, functional cellular assay\",\n      \"pmids\": [\"21907011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKCα phosphorylates eIF4G1 at Ser1186. PKCα activation via phorbol esters elicits orchestrated phosphorylation events that modulate eIF4G1 structure and control interaction with the eIF4E kinase Mnk1.\",\n      \"method\": \"Phosphoproteomics, site-directed mutagenesis, PKCα-specific activation with phorbol esters\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus mutagenesis, single lab\",\n      \"pmids\": [\"21576361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MAPK-mediated phosphorylation of the Mnk1 active site controls eIF4G binding: the C-terminal domain of Mnk1 restricts its eIF4G interaction. Mnk1 autoregulates its interaction with eIF4G, releasing itself after phosphorylating its substrate (eIF4E). This was demonstrated using a splice variant, kinase-dead mutant, and small-molecule Mnk1 inhibitor.\",\n      \"method\": \"Co-immunoprecipitation, splice variant analysis, kinase-dead mutant, Mnk1 inhibitor\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with multiple genetic and pharmacological tools, single lab\",\n      \"pmids\": [\"20823271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cdk1:cyclin B phosphorylates eIF4G1 at Ser1232 during mitosis. This phosphorylation strongly enhances eIF4A interaction with HEAT domain 2 of eIF4G but decreases association of the eIF4G/eIF4A complex with RNA, implicating this event in the mitotic translation initiation shift.\",\n      \"method\": \"Phosphoproteomics, in vitro phosphorylation with recombinant Cdk1:cyclin B, kinase inhibition assays, kinase depletion-reconstitution, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphorylation with recombinant kinase plus multiple orthogonal cellular assays in one study\",\n      \"pmids\": [\"24248602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Pak2 binds to and phosphorylates eIF4G at Ser896, inhibiting association of eIF4E with the m7GTP cap and reducing translation initiation. Pak2 and eIF4E compete for binding to this site on eIF4G. The S896D phosphomimetic mutant inhibits translation while S896A does not.\",\n      \"method\": \"In vitro kinase assay, eIF4G-depleted reticulocyte lysate reconstitution, eIF4G Ser896 mutants, RNA interference\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay combined with reconstitution in depleted lysate and site-specific mutagenesis\",\n      \"pmids\": [\"16281055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Neural RNA-binding protein Musashi1 (Msi1) inhibits translation initiation by competing with eIF4G for binding to PABP. This competition prevents assembly of the 80S ribosome (but not the 48S complex). Deletion of the PABP-interacting domain in Msi1 abolishes its translational repression function.\",\n      \"method\": \"Identification of PABP as Msi1-binding partner, competitive binding assay with eIF4G, ribosome assembly assay, deletion mutant analysis, stress granule localization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying competition mechanism, functional deletion analysis, single lab with multiple methods\",\n      \"pmids\": [\"18490513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"eIF4G-PABP interaction is critical for translational control in Xenopus oocytes: expression of an eIF4GI mutant defective in PABP binding reduces translation of polyadenylated mRNA and dramatically inhibits progesterone-induced oocyte maturation.\",\n      \"method\": \"Microinjection of mutant eIF4GI into Xenopus oocytes, in vivo translation assay, maturation assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutant in an in vivo developmental model, single lab\",\n      \"pmids\": [\"10996799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Adenovirus 100K protein possesses a selective binding element for the tripartite leader mRNA, forms a complex with eIF4G and PABP, and promotes ribosome shunting. The ability of 100K to bind both the tripartite leader and eIF4G is critical for ribosome shunting. 100K competitively displaces Mnk1 from eIF4G and blocks eIF4E phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, polysome analysis, mutational analysis, in vitro translation assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and mutagenesis with functional translation assay, single lab\",\n      \"pmids\": [\"15314025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Adenovirus 100K protein displaces Mnk1 from eIF4G via a shared eIF4G-binding motif located in the N-terminal 66 aa of 100K. 100K binds eIF4G more strongly than Mnk1 and its binding is RNA-independent, unlike Mnk1 whose eIF4G binding is RNA-dependent.\",\n      \"method\": \"Co-immunoprecipitation, competitive binding assay, domain mapping, in vitro translation assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and competition binding with domain-mapped interactions, single lab\",\n      \"pmids\": [\"15220445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Yeast eIF4G homologs (Tif4631p and Tif4632p) share a conserved Pab1p-binding site required for poly(A)-tail-stimulated translation of uncapped mRNAs in vitro and for synergistic cap/poly(A) stimulation. The region encompassing the Pab1p-binding site on eIF4G1 becomes essential for growth when the eIF4E-binding site is mutated.\",\n      \"method\": \"In vitro translation assay, deletion/mutation analysis, yeast genetic epistasis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro functional assay combined with yeast genetic epistasis analysis\",\n      \"pmids\": [\"9256432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Scd6 (yeast) represses translation by binding the eIF4G subunit of eIF4F via its RGG domain, forming a translation-repressed mRNP. Several other RGG-domain proteins (Npl3, Sbp1) also directly bind eIF4G and repress translation via their RGG motifs.\",\n      \"method\": \"Co-purification, direct binding assay, in vivo translation repression assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-purification with functional translation repression assay, domain-specific (RGG), single lab\",\n      \"pmids\": [\"22284680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Yeast eIF4G1 binds single-stranded RNA at three distinct sites: N-terminal (aa 1-82), middle (aa 492-539, RS-rich), and C-terminal (aa 883-952, RS-rich). Full-length eIF4G1 has ~100-fold higher RNA affinity than individual sites alone. Deletion of any two sites strongly impairs in vitro translation and yeast cell growth; arginine-to-alanine mutations in the middle RS site abolish its RNA-binding activity.\",\n      \"method\": \"RNA binding assay, alanine mutagenesis, in vitro translation, yeast growth assay\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple deletion and mutagenesis experiments with in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"12810920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"eIF4G has intrinsic G-quadruplex (G4) binding activity that is required for tiRNA-mediated translation repression. Targeting eIF4G with G4-forming tiRNAs impairs 40S ribosome scanning on mRNAs and leads to formation of eIF2α-independent stress granules.\",\n      \"method\": \"Direct binding assay (G4-eIF4G), ribosome scanning assay, stress granule imaging, tiRNA functional assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus functional assays, single lab, novel activity\",\n      \"pmids\": [\"32374873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Neuronal microexons in eIF4G1 (and eIF4G3) overlapping prion-like domains are activity-dependent in their splicing and frequently disrupted in autism. CRISPR-Cas9 deletion of the eIF4G1 microexon selectively upregulates synaptic proteins, causes ribosome stalling, and promotes coalescence of cytoplasmic granule components including FMRP. Mice lacking the Eif4g1 microexon show social behavior, learning, and memory deficits with altered hippocampal synaptic plasticity.\",\n      \"method\": \"CRISPR-Cas9 deletion, ribosome profiling, RNA-seq, mouse behavioral assays, synaptic plasticity electrophysiology, granule imaging\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal molecular and in vivo methods in one study demonstrating mechanism of translational brake via microexon\",\n      \"pmids\": [\"31999954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"eIF4G1 upregulation in breast cancer cells selectively increases translation of mRNAs involved in survival and DNA damage response following ionizing radiation. Reduced eIF4G1 (but not eIF4G2) sensitizes cells to DNA damage and delays resolution of DNA damage foci with little effect on overall protein synthesis, establishing a specific role for eIF4G1 in specialized translation.\",\n      \"method\": \"siRNA knockdown, polysome profiling, translation reporter assays, DNA damage foci assay, apoptosis and autophagy assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with specific phenotypic readouts and translational profiling, single lab\",\n      \"pmids\": [\"23112151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Yeast eIF4G2 HEAT domain and flanking residues are required for optimal interaction with AUG recognition factors eIF5 and eIF1. eIF1 binds simultaneously to eIF4G and eIF3c in vitro. HEAT domain mutations that impair eIF4G–eIF1/eIF5 interaction enhance translation from a non-AUG codon, indicating a role in start-codon fidelity.\",\n      \"method\": \"In vitro binding assay, genetic co-overexpression suppression, start-codon fidelity reporter\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding combined with yeast genetic epistasis, single lab\",\n      \"pmids\": [\"12861028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"eIF4G1 exists in two mutually exclusive complexes: one with eIF4E and one with eIF1. The eIF1-eIF4G1 interaction promotes leaky scanning and prevents cap-proximal initiation, while eIF4E-eIF4G1 antagonizes scanning and is required for TISU-dependent translation. The eIF1-binding site on eIF4G1 is also indirectly contacted by eIF4E.\",\n      \"method\": \"Co-immunoprecipitation, eIF1 binding-deficient mutant, luciferase translation reporters, domain mapping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutant-based dissection of two complexes with functional translation assays, single lab\",\n      \"pmids\": [\"29987188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"OGT O-GlcNAc-modifies eIF4G1 at Ser-61, and this modification is critical for eIF4G1 protein stability. Loss of OGT in β-cells reduces eIF4G1 stability, leading to decreased CPE levels and impaired proinsulin processing. Overexpression of eIF4G1 in βOGTKO islets fully reverses hyperproinsulinemia.\",\n      \"method\": \"Click O-GlcNAc labeling, site-directed mutagenesis (Ser-61), immunoblotting, islet overexpression rescue experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific PTM mapping by mutagenesis plus functional rescue, single lab\",\n      \"pmids\": [\"31300553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Arginine methylation of the Scd6 RGG motif by the methyltransferase Hmt1 promotes Scd6 binding to eIF4G1 and augments translation repression activity. An arginine methylation-defective Scd6 mutant fails to bind eIF4G1 efficiently and is defective in stress granule formation.\",\n      \"method\": \"In vivo methylation assay, pulldown binding assay with eIF4G1, live-cell imaging, growth rescue assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay combined with live imaging and methylation mapping, single lab\",\n      \"pmids\": [\"27613419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VPS35 and EIF4G1 interact genetically in yeast and converge on α-synuclein pathobiology. EIF4G1 upregulation causes protein misfolding defects; expression of sortilin downstream of VPS35 rescues these defects. These genetic interactions are conserved in worm and mouse neurons.\",\n      \"method\": \"Yeast genetic interaction screen, overexpression/suppression experiments, transgenic mouse model, neuronal models\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in multiple model organisms, single lab\",\n      \"pmids\": [\"25533483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CBP80 (cap-binding protein 80) and eIF4G share a common origin and similar HEAT domain organization. A structural model based on the CBP80-CBP20 crystal structure suggests how the domains of eIF4G are oriented and could interact with translation factors.\",\n      \"method\": \"Sequence and structural analysis, domain homology modeling based on CBP80-CBP20 crystal structure\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/structural modeling without experimental validation of eIF4G-specific interactions\",\n      \"pmids\": [\"16156639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In human cells, eIF4G is associated with eIF4AI or eIF4AII but not both simultaneously, establishing a 1:1 stoichiometry rather than 1:2. Tagged eIF4A complexes with eIF4G contain no endogenous eIF4A, confirming that each eIF4G binds only one molecule of eIF4A despite having two binding sites.\",\n      \"method\": \"Co-immunoprecipitation of tagged eIF4A isoforms in HEK cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with tagged proteins demonstrating stoichiometry, single lab\",\n      \"pmids\": [\"11408474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Leucine stimulates eIF4E·eIF4G assembly and eIF4G(Ser1108) phosphorylation in rat skeletal muscle through a signaling pathway independent of mTOR (unaffected by rapamycin or PI3K inhibition).\",\n      \"method\": \"Hindlimb perfusion model, co-immunoprecipitation (eIF4E IP), Western blotting for phospho-eIF4G(Ser1108)\",\n      \"journal\": \"The Journal of nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — physiological model with pharmacological dissection, single lab\",\n      \"pmids\": [\"15226457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Fas/CD95 receptor activation in Jurkat cells induces caspase-dependent cleavage of eIF4G, inhibition of total protein synthesis, and cell death. Caspase inhibitors zVAD.FMK and zDEVD.FMK prevent both eIF4G cleavage and cell death. Signaling through p38 MAP kinase is not required for Fas-induced eIF4G cleavage.\",\n      \"method\": \"Fas receptor activation, caspase inhibitor treatment, Western blot for eIF4G cleavage, protein synthesis measurement\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of caspase pathway with functional translation readout, single lab\",\n      \"pmids\": [\"9821956\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EIF4G1 is a large modular scaffold protein at the center of the eIF4F translation initiation complex that coordinates cap-dependent and cap-independent translation: its N-terminal region binds PABP (via a 29-aa site) to support poly(A)-stimulated translation; the middle HEAT domain interacts with eIF4E (whose binding is allosterically enhanced upon cofolding), recruits and stimulates eIF4A helicase activity by stabilizing its closed interdomain conformation, binds eIF3 (primarily through eIF3c/d/e subunits) to bridge the mRNA cap-binding complex to the 40S ribosomal subunit, and provides a docking site for Mnk1 to phosphorylate eIF4E at Ser209; the complex is regulated by multiple post-translational modifications including PKCα-mediated phosphorylation at Ser1186 (controlling Mnk1 interaction), Pak2-mediated phosphorylation at Ser896 (inhibiting eIF4E association), Cdk1:cyclin B phosphorylation at Ser1232 during mitosis (enhancing eIF4A-HEAT2 interaction while reducing eIF4A-RNA association), and OGlcNAcylation at Ser-61 (controlling protein stability); neuronal alternative splicing of a microexon in the prion-like domain acts as a translational brake by promoting ribosome stalling and FMRP-containing granule formation; disease-associated PD mutations (Ala502Val, Arg1205His) disrupt eIF4E or eIF3e binding respectively and increase cellular sensitivity to oxidative stress.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EIF4G1 is a large modular scaffold that organizes the eIF4F cap-binding complex and bridges mRNA to the 40S ribosome to drive both cap-dependent and cap-independent translation initiation [#1, #14]. Domain dissection by picornaviral proteases established its tripartite architecture: an N-terminal region binding eIF4E, a central region binding eIF3 and eIF4A, and a C-terminal regulatory third [#1], with a conserved central 'ribosome recruitment core' (aa ~642-1091) sufficient to drive translation when tethered to mRNA [#14]. Through coupled folding, EIF4G1 wraps around the eIF4E N-terminus as a helical 'molecular bracelet' that allosterically enhances cap binding [#3], and auxiliary sequences beyond the canonical 4E-binding motif engage the lateral eIF4E surface in a mode that explains competitive displacement by 4E-BPs [#7]. The central HEAT domain clamps eIF4A in a productive closed conformation, stimulating its RNA-dependent ATPase and helicase activity ~40-fold [#5, #6, #19], with one eIF4A bound per eIF4G despite two contact sites [#41]. An extended N-terminal segment binds PABP via the RRM2 domain in a poly(A)-regulated manner, coupling the poly(A) tail to translation [#2, #8], while distinct central subdomains contact eIF3 through the eIF3c/d/e subunits to recruit the 40S subunit [#9, #10]. EIF4G1 additionally provides the docking site that recruits Mnk1 to phosphorylate eIF4E [#1] and partitions between mutually exclusive eIF4E and eIF1 complexes that control scanning behavior and start-codon selection [#36]. Its activity is gated by phosphorylation — Pak2 at Ser896 blocking eIF4E association [#24], Cdk1:cyclin B at Ser1232 reprogramming eIF4A and RNA contacts during mitosis [#23], and PKC\\u03b1 at Ser1186 modulating Mnk1 interaction [#21] — and by O-GlcNAcylation at Ser-61 that controls protein stability [#37]. EIF4G1 is a hub for translational repression and viral hijacking, being sequestered by Hsp27 during heat shock [#12], targeted by repressors such as Musashi1 and Scd6 that compete for PABP or eIF4G [#25, #30], used by picornaviral, rotaviral, and adenoviral factors to redirect initiation [#13, #17, #27], and cleaved by caspases during Fas-induced apoptosis [#43]. Neuronal microexon splicing in its prion-like domain acts as a translational brake promoting ribosome stalling and FMRP granule formation [#33], and disease-associated familial Parkinson's mutations (Ala502Val, Arg1205His) disrupt eIF4E or eIF3e binding and increase oxidative-stress sensitivity [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established the modular blueprint of eIF4G by mapping which factors bind which region, separating cap-dependent mRNA recruitment from ribosome attachment and helicase functions.\",\n      \"evidence\": \"Domain-specific proteolysis with rhinovirus 2A and FMDV L proteases plus binding assays in vitro\",\n      \"pmids\": [\"7665619\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Boundaries are approximate\", \"Did not resolve PABP-binding N-terminal extension or PTM control\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Revealed an N-terminal PABP-binding site, connecting the poly(A) tail to translation initiation through eIF4G.\",\n      \"evidence\": \"5' RACE ORF extension, co-IP, deletion analysis, and in vitro translation in human/yeast systems\",\n      \"pmids\": [\"9857202\", \"9256432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PABP contact not resolved here\", \"Poly(A) allostery not yet defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed eIF4G is the recruitment platform that brings Mnk1 to phosphorylate eIF4E, and defined a central core sufficient for ribosome recruitment.\",\n      \"evidence\": \"Co-IP, eIF4E-binding mutants, cell phosphorylation assays, and in vivo tethering of the central domain\",\n      \"pmids\": [\"9878069\", \"10469664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mnk1 release dynamics undefined\", \"C-terminal regulatory function not specified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated eIF4G's central region directs cap-independent (IRES) translation and that eIF4A binding boosts IRES affinity, while heat shock and viral proteases can sequester or destroy eIF4G to shut translation down.\",\n      \"evidence\": \"In vitro 48S reconstitution on EMCV IRES, purified-protein Hsp27 binding, and FMDV 3C protease cleavage in cells\",\n      \"pmids\": [\"10913184\", \"10859165\", \"10590115\", \"10996799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IRES recruitment mechanism partly inferred\", \"Hsp27 binding site on eIF4G not mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved that eIF4G undergoes coupled folding around eIF4E as a molecular bracelet that allosterically enhances cap binding, and identified intrinsic RNA-binding sites in eIF4G.\",\n      \"evidence\": \"NMR solution structure of eIF4E/eIF4G complex with yeast polysome validation; RNA-binding/mutagenesis assays\",\n      \"pmids\": [\"14675538\", \"12810920\", \"12861028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Allosteric coupling to downstream steps not fully traced\", \"Start-codon fidelity role shown in yeast only\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the structural mechanism by which eIF4G stimulates eIF4A — a soft clamp stabilizing the closed helicase conformation — and identified Pak2 as a kinase that inhibits eIF4E association.\",\n      \"evidence\": \"NMR mapping of the eIF4G middle domain on eIF4A; in vitro kinase assay and Ser896 mutants in depleted lysate\",\n      \"pmids\": [\"16166382\", \"16281055\", \"15528191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cooperativity with RNA/ATP inferred from binding states\", \"Pak2 signaling context limited\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the eIF3 subunit(s) through which eIF4G recruits the 40S subunit and placed this interaction under mTOR/insulin control.\",\n      \"evidence\": \"Proteolysis-MS, competitive binding, cell-free translation, and insulin/rapamycin co-IP\",\n      \"pmids\": [\"16766523\", \"16541103\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mTOR-eIF3-eIF4G link single lab\", \"eIF3e-only model later revised\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided atomic detail of the eIF4G-eIF4A interface, pinpointing essential residues (Trp579) for helicase activation, and described a small-molecule disruptor of eIF4E/eIF4G.\",\n      \"evidence\": \"Crystal structure of eIF4G-m/eIF4A with yeast mutagenesis; 4EGI-1 binding/translation assays\",\n      \"pmids\": [\"18606994\", \"17254965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human structural confirmation pending at this stage\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established the structural and allosteric basis of poly(A)-regulated PABP recognition and showed eIF4G1 selectively supports survival/DNA-damage-response translation in cancer.\",\n      \"evidence\": \"2.0 Å crystal structure with NMR/SAXS/ITC/EMSA; siRNA knockdown with polysome profiling and DNA damage foci assays\",\n      \"pmids\": [\"23041282\", \"23112151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mRNA selectivity determinants undefined\", \"Cancer role from single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Refined the eIF3-binding model to multiple subunits/subdomains and identified mitotic Cdk1:cyclin B phosphorylation at Ser1232 that reprograms eIF4A and RNA contacts.\",\n      \"evidence\": \"Fluorescence anisotropy and cross-linking for eIF3 contacts; in vitro Cdk1 phosphorylation with cellular reconstitution\",\n      \"pmids\": [\"24092755\", \"24248602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of mitotic shift on specific mRNAs not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Clarified the structural mechanism of 4E-BP-like competitive displacement at eIF4E and linked Scd6 arginine methylation to enhanced eIF4G1 repression.\",\n      \"evidence\": \"Crystal structures of human/Drosophila eIF4E-eIF4G; methylation and pulldown assays in yeast\",\n      \"pmids\": [\"27773676\", \"27613419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repressor regulation characterized in yeast only\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined two mutually exclusive eIF4G1 complexes (eIF4E vs eIF1) that determine scanning behavior and start-codon selection.\",\n      \"evidence\": \"Co-IP, eIF1-binding-deficient mutants, and luciferase reporters\",\n      \"pmids\": [\"29987188\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Switch between complexes mechanistically open\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Uncovered intrinsic G-quadruplex binding by eIF4G mediating tiRNA repression, and showed a neuronal microexon in the prion-like domain acts as a translational brake driving stalling and FMRP granules.\",\n      \"evidence\": \"Direct G4 binding/scanning assays; CRISPR microexon deletion with ribosome profiling and mouse behavioral/synaptic assays\",\n      \"pmids\": [\"32374873\", \"31999954\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"G4-binding region on eIF4G not mapped\", \"Microexon mechanism of stalling partly inferred\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many PTMs, alternative complexes, and condensate-promoting domains are integrated to select specific mRNAs for translation in distinct physiological and disease states remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking PTM combinations to mRNA-specific output\", \"Mechanism of Parkinson's-associated dysfunction in vivo unresolved\", \"Prion-like domain condensate regulation incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 9, 10, 14]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [13, 31, 32]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6, 19, 3]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [14, 36, 33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12, 33, 32]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [9, 14, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72613\", \"supporting_discovery_ids\": [1, 9, 14]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 5, 9]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [18, 13]}\n    ],\n    \"complexes\": [\"eIF4F\"],\n    \"partners\": [\"EIF4E\", \"EIF4A1\", \"EIF3E\", \"PABPC1\", \"MKNK1\", \"EIF1\", \"EIF3C\", \"HSPB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":9,"faith_total":9,"faith_pct":100.0}}