{"gene":"EIF4A1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1992,"finding":"Site-directed mutagenesis of recombinant eIF-4A defined functional roles for conserved DEAD-box motifs: the ATPase A motif (AXXXXGKT) is required for ATP binding; the DEAD motif couples ATP hydrolysis to RNA helicase activity; the HRIGRXXR motif is involved in ATP hydrolysis; and the SAT region is essential for RNA unwinding. Recombinant eIF-4A together with recombinant eIF-4B exhibit RNA helicase activity in vitro.","method":"In vitro reconstitution of RNA helicase activity with recombinant proteins; site-directed mutagenesis of conserved motifs; ATPase and helicase assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution combined with mutagenesis of multiple sites, rigorous biochemical assays establishing structure-function relationships","pmids":["1378397"],"is_preprint":false},{"year":1994,"finding":"Dominant-negative eIF-4A mutants potently inhibit translation by blocking recycling through the eIF-4F complex. eIF-4A functions primarily as a subunit of eIF-4F rather than as a free factor; eIF-4F (not free eIF-4A) is the primary functional unit and is six-fold more effective than free eIF-4A at rescuing translation. Mutant eIF-4A also inhibits eIF-4F-dependent but not eIF-4A-dependent RNA helicase activity, indicating that eIF-4A must cycle through eIF-4F during translation.","method":"Dominant-negative mutant eIF-4A added to rabbit reticulocyte translation system; rescue experiments with eIF-4A, eIF-4F, eIF-4B; kinetic and helicase assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — functional reconstitution in a cell-free translation system with multiple orthogonal assays (translation inhibition, helicase activity, rescue experiments)","pmids":["8131750"],"is_preprint":false},{"year":2001,"finding":"The central eIF4A-binding domain of mammalian eIF4G and the eIF4A-binding domain of yeast eIF4G share conserved amino acid motifs required for eIF4A interaction. Yeast eIF4G mutants defective in eIF4A binding show strongly impaired translation and growth in vivo. Mammalian eIF4A binds tightly to yeast eIF4G1, but mammalian eIF4A cannot substitute for yeast eIF4A in vivo despite high sequence conservation.","method":"Yeast genetics (temperature-sensitive mutants), in vitro binding assays, yeast in vitro translation system, rescue experiments","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — combination of in vitro binding, genetic epistasis, and in vivo functional assays in a single study","pmids":["11256967"],"is_preprint":false},{"year":2010,"finding":"Plakophilin 1 (PKP1) directly associates with eIF4A1, co-purifies with eIF4A1 in cap-binding complexes, and stimulates eIF4A1 ATPase activity at the molecular level. PKP1 overexpression promotes eIF4A1 recruitment into cap-binding complexes and stimulates eIF4A1-dependent (cap- and EMCV IRES-mediated) translation but not eIF4A1-independent (HCV IRES-mediated) translation. PKP1 stimulation of translation correlates with increased cell proliferation and cell size.","method":"Co-immunoprecipitation, co-purification in cap complex, in vitro ATPase assay, IRES-dependent translation assays, overexpression/knockdown in MCF7 cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct ATPase assay plus reciprocal co-IP and functional translation assays with appropriate controls in single study","pmids":["20156963"],"is_preprint":false},{"year":2019,"finding":"PHGDH (phosphoglycerate dehydrogenase) interacts with eIF4A1 and eIF4E, and this interaction facilitates assembly of the eIF4F complex on 5' mRNA structures to promote cap-dependent translation initiation in pancreatic cancer cells. PHGDH knockdown disrupts eIF4F complex assembly and inhibits translation of relevant target proteins.","method":"Co-immunoprecipitation, pulldown, knockdown experiments with translation readout in PANC-1 cells, xenograft model","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and functional knockdown with translation phenotype, single lab, moderate methodological depth","pmids":["30744688"],"is_preprint":false},{"year":2020,"finding":"Hippuristanol (Hipp) binds to the carboxyl-terminal domain of eIF4A1, locks it in a closed conformation, and inhibits its RNA binding. Using CRISPR/Cas9-based variomics, functional Hipp-resistant EIF4A1 alleles were identified, linking Hipp's translation-inhibitory and cytotoxic properties directly to eIF4A1 target engagement. Genome-wide translational profiling showed that eIF4A1-dependent mRNAs are characterized by longer 5' leaders, greater overall secondary structure, and higher cytosine content.","method":"CRISPR/Cas9 variomics screen, genome-wide ribosome profiling, mRNA structural analysis, cell viability assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — CRISPR variomics directly linking alleles to target engagement, orthogonal genome-wide translation profiling in single rigorous study","pmids":["32766783"],"is_preprint":false},{"year":2020,"finding":"ALC1 (chromatin remodeler) cooperates with eIF4A1 to stabilize the most abundant splicing form of CtIP mRNA, through a specific RNA sequence in the 5' UTR of CtIP. This mRNA stabilization function of eIF4A1 is independent of ALC1's chromatin-remodeling activity, representing a non-canonical role for eIF4A1 in regulating DNA end resection by controlling CtIP mRNA levels.","method":"Co-immunoprecipitation, siRNA knockdown of ALC1 and eIF4A1, reporter assays with CtIP 5' UTR sequences, RT-PCR for mRNA stability","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP and functional knockdown data with mRNA stability readout, single lab, multiple methods","pmids":["32392243"],"is_preprint":false},{"year":2020,"finding":"USP15 interacts with eIF4A1 and deubiquitinates it, promoting translational efficacy in keratinocytes. USP15 knockout in mice delays wound re-epithelialization, and USP15-silenced keratinocytes show inhibited migration and proliferation. The USP15-EIF4A1 complex accelerates re-epithelialization.","method":"Co-immunoprecipitation, mass spectrometry, USP15 knockout mouse model, USP15 siRNA knockdown in HaCaT cells, wound healing assays, RNA-sequencing","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification plus KO mouse phenotype and functional cell assays, single lab","pmids":["32671073"],"is_preprint":false},{"year":2021,"finding":"PRP-derived exosomes promote wound healing via USP15, which deubiquitinates EIF4A1, stabilizing it and enhancing its function in keratinocyte proliferation and migration.","method":"In vitro CCK-8, EdU, scratch wound and transwell assays; in vivo wound healing mouse model; functional validation of USP15-EIF4A1 deubiquitination axis","journal":"Oxidative medicine and cellular longevity","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional in vitro and in vivo data supporting USP15-mediated deubiquitination of EIF4A1, corroborates independent study (PMID 32671073)","pmids":["34422211"],"is_preprint":false},{"year":2018,"finding":"The marine natural product elatol specifically inhibits eIF4A1 ATPase activity in vitro, inhibits eIF4A1 helicase activity, and binds the helicase core of eIF4A1 with an unexpected 2:1 stoichiometry. Elatol-sensitive tumor cells show acute loss of translationally regulated proteins, leading to growth arrest and apoptosis.","method":"Target-based ATPase inhibition assay, helicase inhibition assay, binding/mutagenesis studies, cell-based mechanistic studies, xenograft in vivo model","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay, helicase assay, binding stoichiometry, mutagenesis, and in vivo validation in single rigorous study","pmids":["29844128"],"is_preprint":false},{"year":2023,"finding":"eIF4A1-dependent mRNAs contain AG-rich (purine-rich) motifs in their 5' UTRs that specifically activate eIF4A1 unwinding of local RNA structure. Binding of eIF4A1 to AG-rich sequences leads to multimerization of eIF4A1, with distinct subunits performing different enzymatic activities. Structural data suggest that RNA-binding by multimeric eIF4A1 induces conformational changes in RNA for optimal positioning proximal to RNA duplexes enabling efficient unwinding.","method":"In vitro RNA unwinding assays, eIF4A1 mutant analysis, structural studies, ribosome profiling, cell-based translation reporters, identification of AG-rich 5' UTR motifs","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro functional assays plus structural data and genome-wide translation profiling, multiple orthogonal methods in single study","pmids":["36727461"],"is_preprint":false},{"year":2024,"finding":"eIF4A1 preferentially binds mRNAs containing terminal oligopyrimidine (TOP) motifs in an interaction that depends on the La-related RNA-binding protein LARP1. Upon mTORC1 inhibition, eIF4A1 increases interaction between TOP mRNAs and LARP1, thereby enhancing translational repression of TOP mRNAs. Deletion of EIF4A1 attenuates translational repression of TOP mRNAs upon mTORC1 inactivation, revealing a repressive non-canonical role for eIF4A1.","method":"RNA pulldown followed by sequencing (RNA-seq), ribosome profiling, EIF4A1 deletion cell lines, mTORC1 inhibitor treatment, co-immunoprecipitation of LARP1 with TOP mRNAs","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — RNA pulldown-seq, ribosome profiling, genetic deletion, and interaction assays in a single rigorous study with orthogonal methods","pmids":["38773334"],"is_preprint":false},{"year":2024,"finding":"The CRL3IBTK ubiquitin ligase complex (with IBTK as substrate-binding adaptor) interacts with eIF4A1 and catalyzes non-degradative ubiquitination of eIF4A1. This ubiquitination promotes cap-dependent translational initiation, nascent protein synthesis, and oncogene expression. mTORC1 and S6K1 directly phosphorylate IBTK to augment eIF4A1 ubiquitination, linking the mTORC1/S6K1 signaling axis to eIF4A1 activity.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, phosphorylation assay, IBTK knockout/knockdown, ribosome profiling, xenograft in vivo model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro ubiquitination and phosphorylation assays, co-IP, genetic knockouts with functional translation readouts, in vivo validation","pmids":["38738857"],"is_preprint":false},{"year":2024,"finding":"EIF4A1 and EIF4A2 play distinct molecular roles in B cells: eIF4A1 controls global protein synthesis while eIF4A2 regulates biogenesis of 18S ribosomal RNA and the 40S ribosome subunit. EIF4A1 is essential for B-cell development and the germinal centre response; its loss impairs protein synthesis and MYC expression after B cell activation.","method":"Mouse genetic conditional knockouts (Cre-lox), ribosome profiling or polysome analysis, rRNA biogenesis assays, B cell developmental analysis by flow cytometry","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse conditional KO genetics with multiple functional readouts distinguishing eIF4A1 from eIF4A2 functions, replicated in B-cell development context","pmids":["39516355"],"is_preprint":false},{"year":2023,"finding":"EIF4A1 is essential for B cell development and the germinal centre response in mice. After B cell activation, EIF4A1 facilitates increased rates of protein synthesis, MYC expression, and expression of cell cycle regulators. EIF4A1-deficient B cells remain viable, whereas combined inhibition of EIF4A1 and EIF4A2 by Hippuristanol induces cell death.","method":"Conditional Eif4a1 knockout in B cells (mouse model), protein synthesis assays, western blotting, Hippuristanol pharmacological inhibition, germinal centre assays","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional genetic KO in primary mouse B cells with multiple orthogonal functional readouts","pmids":["38011999"],"is_preprint":false},{"year":2022,"finding":"eIF4A1 mediates translational regulation of the oncogene BRD2, whose 5' UTR contains the most enriched eIF4A1-binding motifs. RNA immunoprecipitation followed by RNA sequencing (RIP-seq) established this eIF4A1-BRD2 translational axis in prostate cancer cells. EIF4A1 expression is epigenetically regulated by DNA methylation at a CpG-rich island, with hypomethylation correlating with elevated EIF4A1 expression in prostate cancer.","method":"RIP-sequencing, DNMT3a CRISPR-Cas9 epigenetic targeting, EIF4A1 heterozygous knockout/knockdown, western blotting, polysome profiling implied","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq plus CRISPR-based epigenetic manipulation and KO functional assays, single lab","pmids":["35361883"],"is_preprint":false},{"year":2016,"finding":"Comparative proteomic and transcriptomic analysis of eIF4A1 vs. eIF4E silencing in melanoma cells revealed that eIF4A1 and eIF4E exert common effects on translation through coding regions and 3' UTRs, while their divergent effects occur through the 5' UTR. Silencing eIF4A1 decreases melanoma proliferation and invasion, with effects on cell cycle proteins.","method":"siRNA silencing of eIF4A1/eIF4E, quantitative proteomics, RNA-seq, polysome profiling, proliferation and invasion assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal omics methods (proteomics + transcriptomics + polysome) in single study, single lab","pmids":["27879264"],"is_preprint":false},{"year":2015,"finding":"eIF4A1 knockdown in MCF7 breast cancer cells restricts cell growth and cycling. Polysome profiling defined the eIF4A1-dependent translatome, which is enriched for oncogenic mRNAs encoding G-protein constituents, cyclins, and protein kinases, and for mRNAs with G/C-rich 5' UTRs with potential to form G-quadruplexes.","method":"eIF4A1 knockdown (siRNA), polysome profiling with microarray/sequencing, cell growth and cell cycle assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome profiling plus functional KD phenotype, single lab, two orthogonal methods","pmids":["25611378"],"is_preprint":false},{"year":2025,"finding":"eIF4A1 directly binds to transgelin (Tagln) protein, preventing its ubiquitination and degradation, which leads to upregulation of p53 and promotes nuclear translocation of both Tagln and p53, resulting in cardiomyocyte apoptosis during ischemia/reperfusion injury. Cardiomyocyte-specific eIF4A1 knockout attenuates cardiomyocyte apoptosis and reduces infarct area in mice.","method":"Co-immunoprecipitation, cardiomyocyte-specific knockout mouse model (myocardial I/R model), overexpression/knockdown, ubiquitination assays, nuclear fractionation, western blot","journal":"Acta pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus cardiomyocyte-specific KO with functional phenotypes, single lab, multiple orthogonal methods","pmids":["39856433"],"is_preprint":false},{"year":2025,"finding":"eIF4A1/2 acts as an RNA chaperone during mitotic exit to enable chromatin decondensation. In a cell-free condensation assay, eIF4A1/2 is crucial for chromatin decondensation, relying on its RNA-binding ability but not its ATPase activity. Reducing eIF4A1/2 levels slows chromatin decondensation during nuclear reformation, while increasing eIF4A1/2 concentration on mitotic chromosomes accelerates decondensation. eIF4A1/2 dissociates biomolecular condensates of RNA and perichromatin proteins in vitro, regulating the composition and fluidity of the perichromatin layer.","method":"Cell-free chromatin condensation assay, live cell imaging, eIF4A1/2 knockdown, overexpression targeting mitotic chromosomes, in vitro condensate dissolution assay, ATPase-dead mutant analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — cell-free reconstitution assay plus live imaging, knockdown and gain-of-function, ATPase mutant, and in vitro condensate assays in single rigorous study","pmids":["40069174"],"is_preprint":false},{"year":2024,"finding":"IGF2BP2 (m6A reader) recruits EIF4A1 to promote the translation initiation of CDK6 mRNA in an m6A-dependent manner, increasing CDK6 protein levels at the level of translation rate rather than mRNA stability. This IGF2BP2-EIF4A1-CDK6 axis drives G1/S cell cycle progression in triple-negative breast cancer.","method":"Co-immunoprecipitation, RNA immunoprecipitation, polysome fractionation, mRNA stability assay, siRNA knockdown, overexpression in TNBC cell lines","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP, RIP, and polysome assays supporting translation mechanism, single lab","pmids":["37983610"],"is_preprint":false},{"year":1993,"finding":"eIF-4A interacts with specific cis-acting regulatory elements in the 5' UTR of human asparagine synthetase mRNA (spanning -60 to -120 bases from the initiation codon). A 46 kDa trans-acting protein identified as eIF-4A by immunoprecipitation with anti-eIF-4A monoclonal antibody was shown to protect these elements from T1 RNase digestion.","method":"T1 RNase footprinting, hybrid arrest translation, immunoprecipitation with monoclonal anti-eIF-4A antibody","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Weak — footprinting and immunoprecipitation identifying specific mRNA interaction, single lab, limited mechanistic depth","pmids":["8093451"],"is_preprint":false},{"year":2025,"finding":"X-ray crystal structure of an amidino-rocaglate (ADR) in complex with eIF4A1, AMPPNP, and poly r(AG)5 RNA at 1.69 Å resolution shows that rocaglates clamp eIF4A1 onto polypurine RNA. ADR binding pose is similar to rocaglamide A (RocA), but its rigidified scaffold is preorganized in an eIF4A1-RNA binding-competent conformation, avoiding entropic penalties and improving potency.","method":"X-ray crystallography (1.69 Å resolution), computational modeling","journal":"ACS omega","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution X-ray crystal structure with computational validation of mechanism, single study","pmids":["39989799"],"is_preprint":false},{"year":2025,"finding":"BLF1 (Burkholderia lethal factor 1 toxin) modulates eIF4A1 ATPase activity. eIF4A1 has higher ATP-binding affinity (lower Km) than eIF4A2. Leucine 98 (L98) and alanine 100 (A100) play important roles in the ATPase activities of eIF4A isoforms, as revealed by N-terminal domain swapping and single amino acid mutations.","method":"In vitro ATPase assay, domain swapping, site-directed mutagenesis, temperature/pH/Mg2+ sensitivity assays","journal":"Toxins","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic assays with mutagenesis, single lab, novel finding but limited independent replication","pmids":["40423315"],"is_preprint":false},{"year":2025,"finding":"P7C3 compound directly binds eIF4A1 (identified by CETSA-mass spectrometry and protein microarray), inhibits eIF4A1-mediated global protein synthesis (including c-Myc), and disrupts autophagic flux by downregulating ULK1 in hepatic stellate cells. eIF4A1 knockdown mimics P7C3 effects on fibrotic markers.","method":"Cellular thermal shift assay (CETSA) coupled with mass spectrometry, protein microarray, molecular docking, eIF4A1 knockdown/overexpression, protein synthesis assay, autophagic flux assay","journal":"Archives of pharmacal research","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — CETSA-MS target identification plus functional knockdown/overexpression, single lab, multiple orthogonal methods","pmids":["41761033"],"is_preprint":false},{"year":2025,"finding":"EIF4A1 inhibition by eFT226 significantly reduces tumor growth in intrahepatic cholangiocarcinoma PDX models. Zotatifin (eIF4A1 inhibitor) decreases glycolysis of iCCA cells without affecting mitochondrial respiration and shows synergistic apoptosis when combined with Bcl-xl inhibitors.","method":"PDX in vivo tumor model, patient-derived organoids, cell line inhibition assays, metabolic flux assays, combination drug apoptosis assays","journal":"JHEP reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo PDX model plus organoid and metabolic assays, single lab, multiple model systems","pmids":["40529213"],"is_preprint":false},{"year":2025,"finding":"Mechanistic characterization of eIF4A1 inhibitors revealed two distinct eIF4A1 functions linked to distinct mRNA 5' UTR features: C/CG-rich 5' UTRs require efficient mRNA loading by eIF4F (specifically targeted by hippuristanol), while AG-rich motifs plus alternative start sites direct eIF4A1 to start site selection (specifically perturbed by eFT226/zotatifin). These findings were validated by massively parallel reporter assay.","method":"Biochemical inhibitor characterization (hippuristanol vs. eFT226), machine learning model of mRNA features, massively parallel reporter assay (MPRA), ribosome profiling","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — biochemical and genome-scale functional assays with MPRA validation; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"EIF4A1 is an ATP-dependent DEAD-box RNA helicase that functions as the catalytic subunit of the eIF4F cap-binding complex, unwinding secondary structures in mRNA 5' UTRs (particularly those with AG-rich or C/CG-rich motifs) to facilitate 43S pre-initiation complex loading and ribosomal scanning toward the start codon; its helicase activity requires the DEAD motif for coupling ATP hydrolysis to unwinding, the SAT region for RNA strand separation, and the HRIGRXXR region for ATP hydrolysis, and is stimulated by multimerization on AG-rich RNA sequences, regulated by binding partners (eIF4G, PKP1, LARP1) and post-translational modifications (non-degradative ubiquitination by CRL3IBTK downstream of mTORC1/S6K1 signaling, and deubiquitination by USP15), and additionally serves as an RNA chaperone during mitotic exit to dissolve perichromatin condensates enabling chromatin decondensation through its RNA-binding activity independent of ATPase function."},"narrative":{"mechanistic_narrative":"EIF4A1 is an ATP-dependent DEAD-box RNA helicase that serves as the engine of cap-dependent translation initiation by unwinding structured 5' UTRs to permit ribosomal scanning [PMID:1378397, PMID:8131750]. Mutagenesis of recombinant eIF-4A established that its conserved motifs partition catalysis: the ATPase A motif binds ATP, the DEAD motif couples ATP hydrolysis to unwinding, the HRIGRXXR motif performs hydrolysis, and the SAT region executes RNA strand separation [PMID:1378397]. eIF4A1 functions principally as a subunit of the eIF4F complex rather than as a free factor, cycling through eIF4F during each round of initiation [PMID:8131750] via a conserved central binding interface on eIF4G [PMID:11256967]. Its helicase activity is stimulated by binding partners that promote eIF4F assembly and ATPase output, including PKP1 [PMID:20156963] and PHGDH [PMID:30744688], and is further activated by multimerization on AG-rich (purine-rich) 5'-UTR motifs, where distinct subunits perform separable enzymatic steps to reposition RNA for efficient unwinding [PMID:36727461]. eIF4A1-dependent mRNAs are characterized by long, structured, C/CG-rich or G-quadruplex-prone 5' leaders [PMID:32766783, PMID:25611378], and inhibitor studies dissect two activities—eIF4F-mediated mRNA loading versus start-site selection—linked to C/CG-rich versus AG-rich UTR features. The factor is preferentially required for translation of oncogenic mRNAs encoding cyclins, kinases, MYC, BRD2 and CDK6, driving proliferation and cell-cycle progression across cancer contexts [PMID:35361883, PMID:27879264, PMID:25611378, PMID:37983610] and is essential for B-cell development and germinal-centre responses through control of global protein synthesis [PMID:39516355, PMID:38011999]. eIF4A1 activity is regulated post-translationally by non-degradative ubiquitination via the CRL3-IBTK ligase downstream of mTORC1/S6K1 signaling [PMID:38738857] and by USP15-mediated deubiquitination, which stabilizes it to support keratinocyte proliferation and wound re-epithelialization [PMID:32671073, PMID:34422211]. Beyond canonical initiation, eIF4A1 has non-canonical RNA-handling roles: it stabilizes CtIP mRNA to regulate DNA end resection [PMID:32392243], represses TOP-mRNA translation in concert with LARP1 upon mTORC1 inactivation [PMID:38773334], and acts as an RNA chaperone during mitotic exit to dissolve perichromatin condensates and enable chromatin decondensation, a function dependent on RNA binding but not ATPase activity [PMID:40069174]. eIF4A1 is the target of multiple chemically distinct inhibitors—hippuristanol, elatol, and rocaglate/amidino-rocaglate compounds that clamp it onto polypurine RNA—which abrogate translation and tumor growth [PMID:32766783, PMID:29844128, PMID:39989799, PMID:40529213].","teleology":[{"year":1992,"claim":"Established the catalytic logic of eIF4A1 by assigning discrete functions to conserved DEAD-box motifs, defining how ATP binding, hydrolysis, and RNA unwinding are mechanically coupled.","evidence":"In vitro reconstitution of helicase activity with recombinant eIF-4A/eIF-4B plus site-directed mutagenesis of conserved motifs","pmids":["1378397"],"confidence":"High","gaps":["Did not establish how the helicase operates within the intact eIF4F complex in cells","No structural model of the catalytic cycle"]},{"year":1993,"claim":"Provided early evidence that eIF4A1 contacts specific cis-regulatory 5'-UTR elements, foreshadowing its sequence/structure-selective roles.","evidence":"T1 RNase footprinting and immunoprecipitation on human asparagine synthetase mRNA 5' UTR","pmids":["8093451"],"confidence":"Medium","gaps":["Limited mechanistic depth; binding specificity determinants not defined","Functional consequence for translation not directly tested"]},{"year":1994,"claim":"Resolved whether eIF4A1 acts free or complexed, showing eIF4F is the primary functional unit and that eIF4A1 must cycle through eIF4F during translation.","evidence":"Dominant-negative eIF-4A in rabbit reticulocyte lysate with rescue and helicase assays","pmids":["8131750"],"confidence":"High","gaps":["Molecular basis of the cycling mechanism not resolved","Stoichiometry of eIF4A within eIF4F in vivo not defined"]},{"year":2001,"claim":"Defined the conserved eIF4A-binding interface on eIF4G as essential for translation in vivo, while revealing species-specific functional incompatibility.","evidence":"Yeast genetics, in vitro binding, and rescue experiments comparing mammalian and yeast eIF4A/eIF4G","pmids":["11256967"],"confidence":"High","gaps":["Structural basis of the incompatibility unresolved","Did not address regulation of the interaction"]},{"year":2010,"claim":"Identified PKP1 as a direct activator of eIF4A1 ATPase and eIF4F recruitment, linking eIF4A1 stimulation to proliferation and cell size.","evidence":"Co-IP, cap-complex co-purification, in vitro ATPase and IRES-dependent translation assays in MCF7 cells","pmids":["20156963"],"confidence":"High","gaps":["Whether PKP1 modulates target-mRNA selectivity not addressed","Structural mode of ATPase stimulation unknown"]},{"year":2015,"claim":"Defined the eIF4A1-dependent translatome, showing preferential dependence of oncogenic, G/C-rich, G-quadruplex-prone mRNAs.","evidence":"siRNA knockdown plus polysome profiling and cell-cycle assays in MCF7 cells","pmids":["25611378"],"confidence":"Medium","gaps":["Causal link between G-quadruplex unwinding and translation not directly demonstrated","Single cell-line context"]},{"year":2016,"claim":"Separated the shared versus divergent regulatory contributions of eIF4A1 and eIF4E, localizing eIF4A1-specific effects to the 5' UTR.","evidence":"Parallel siRNA silencing with quantitative proteomics, RNA-seq, and polysome profiling in melanoma cells","pmids":["27879264"],"confidence":"Medium","gaps":["Mechanistic basis of 5'-UTR-specific divergence not resolved","Single tumor type"]},{"year":2018,"claim":"Validated eIF4A1 as a druggable target with elatol, demonstrating direct ATPase/helicase inhibition and an unexpected 2:1 binding stoichiometry.","evidence":"In vitro ATPase/helicase assays, binding/mutagenesis, and xenograft model","pmids":["29844128"],"confidence":"High","gaps":["Structural basis of 2:1 stoichiometry not defined","Selectivity over eIF4A2 not fully resolved"]},{"year":2020,"claim":"Pinned down the molecular and structural features dictating eIF4A1 dependence and target engagement, defining hippuristanol's mechanism and the structured/C-rich nature of dependent mRNAs.","evidence":"CRISPR/Cas9 variomics, genome-wide ribosome profiling, and mRNA structural analysis","pmids":["32766783"],"confidence":"High","gaps":["Did not resolve how conformational locking translates to translatome changes mechanistically"]},{"year":2020,"claim":"Revealed a non-canonical eIF4A1 function in mRNA stabilization, linking it to DNA end resection independently of helicase initiation activity.","evidence":"Co-IP, siRNA knockdown of ALC1/eIF4A1, and CtIP 5'-UTR reporter and RT-PCR stability assays","pmids":["32392243"],"confidence":"Medium","gaps":["Whether ATPase activity is required not tested","Direct RNA contact vs. complex-mediated effect not distinguished"]},{"year":2020,"claim":"Identified USP15 as a deubiquitinase of eIF4A1 that stabilizes it to promote translation and wound re-epithelialization, establishing reversible ubiquitin control.","evidence":"Co-IP/MS, USP15 knockout mouse, keratinocyte knockdown, and wound-healing assays; corroborated by PRP-exosome study","pmids":["32671073","34422211"],"confidence":"Medium","gaps":["The cognate ubiquitin ligase opposing USP15 not identified here","Ubiquitin site(s) not mapped"]},{"year":2023,"claim":"Mechanistically defined how AG-rich motifs drive eIF4A1 multimerization, with distinct subunits performing different enzymatic steps to reposition RNA for unwinding.","evidence":"In vitro unwinding assays, mutant analysis, structural studies, and ribosome profiling","pmids":["36727461"],"confidence":"High","gaps":["Precise architecture and stoichiometry of the active multimer not fully resolved","Coupling to scanning in vivo not directly visualized"]},{"year":2024,"claim":"Revealed a repressive non-canonical role: eIF4A1 promotes LARP1-dependent binding of TOP mRNAs to repress their translation upon mTORC1 inhibition.","evidence":"RNA pulldown-seq, ribosome profiling, EIF4A1 deletion, and LARP1 co-IP under mTORC1 inhibition","pmids":["38773334"],"confidence":"High","gaps":["Whether helicase catalysis is required for repression not resolved","Structural basis of TOP-motif recognition unknown"]},{"year":2024,"claim":"Connected mTORC1/S6K1 signaling to eIF4A1 activity through CRL3-IBTK-mediated non-degradative ubiquitination that enhances cap-dependent initiation and oncogene expression.","evidence":"Co-IP, in vitro ubiquitination/phosphorylation assays, IBTK knockout, ribosome profiling, and xenograft","pmids":["38738857"],"confidence":"High","gaps":["How ubiquitination biochemically alters helicase/eIF4F activity not defined","Ubiquitin acceptor lysines not mapped"]},{"year":2024,"claim":"Distinguished eIF4A1 from eIF4A2 in vivo, showing eIF4A1 controls global synthesis and is essential for B-cell development and germinal-centre responses.","evidence":"Mouse conditional knockouts with ribosome/polysome and rRNA biogenesis assays; Hippuristanol co-inhibition","pmids":["39516355","38011999"],"confidence":"High","gaps":["Functional redundancy with eIF4A2 in non-immune tissues not fully mapped","Target-mRNA sets distinguishing the isoforms incompletely defined"]},{"year":2024,"claim":"Showed eIF4A1 can be recruited to specific mRNAs by RNA-binding adaptors (IGF2BP2) for m6A-dependent translation of CDK6, expanding modes of selective recruitment.","evidence":"Co-IP, RIP, polysome fractionation, and stability assays in TNBC cell lines","pmids":["37983610"],"confidence":"Medium","gaps":["Direct vs. bridged eIF4A1-mRNA contact not resolved","Generality beyond CDK6 untested"]},{"year":2025,"claim":"Established an ATPase-independent RNA-chaperone function for eIF4A1 in dissolving perichromatin condensates to drive chromatin decondensation at mitotic exit.","evidence":"Cell-free condensation assay, live imaging, knockdown/gain-of-function, and ATPase-dead mutant analysis","pmids":["40069174"],"confidence":"High","gaps":["How eIF4A1 is targeted to mitotic chromosomes not defined","Relationship to its translation role mechanistically unconnected"]},{"year":2025,"claim":"Provided high-resolution structural insight into how rocaglate-class compounds clamp eIF4A1 onto polypurine RNA, rationalizing inhibitor potency.","evidence":"X-ray crystal structure of an amidino-rocaglate with eIF4A1, AMPPNP, and poly r(AG)5 at 1.69 Å","pmids":["39989799"],"confidence":"High","gaps":["Structure of apo or eIF4F-embedded eIF4A1 not provided here","Does not address multimeric assembly on AG-rich RNA"]},{"year":2025,"claim":"Extended therapeutic targeting of eIF4A1 to cholangiocarcinoma and fibrosis models, linking inhibition to reduced glycolysis, MYC loss, autophagic disruption, and tumor regression.","evidence":"PDX and organoid models with eFT226/zotatifin; CETSA-MS target ID and knockdown with P7C3 in hepatic stellate cells","pmids":["40529213","41761033"],"confidence":"Medium","gaps":["On-target specificity versus off-target effects of new compounds not fully resolved","Mechanistic basis of metabolic and autophagy effects incompletely defined"]},{"year":2025,"claim":"Mapped isoform-specific ATPase determinants and showed eIF4A1's higher ATP affinity over eIF4A2, also identifying a bacterial toxin (BLF1) that modulates its ATPase.","evidence":"In vitro ATPase assays with N-terminal domain swapping and L98/A100 point mutations","pmids":["40423315"],"confidence":"Medium","gaps":["Single lab, limited replication","Physiological relevance of BLF1 modulation in human cells untested"]},{"year":null,"claim":"How eIF4A1's distinct canonical (mRNA loading vs. start-site selection), repressive (LARP1/TOP), mRNA-stabilizing, and ATPase-independent chaperone functions are coordinated within a single protein, and how ubiquitination biochemically reconfigures its activity, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified structural framework linking helicase, multimerization, and chaperone modes","Ubiquitin acceptor sites and their effect on catalysis unmapped","Mechanism directing eIF4A1 to non-translation roles (chromatin, mRNA stability) unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,1,3,9,23]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[10,11,19,21,22]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,9,10]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[1,11,16,17]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,9,23]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,19]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,3,12,13]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[17,20]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,16,25]}],"complexes":["eIF4F cap-binding complex","CRL3-IBTK ubiquitin ligase complex"],"partners":["EIF4G","EIF4E","PKP1","PHGDH","LARP1","USP15","IBTK","IGF2BP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P60842","full_name":"Eukaryotic initiation factor 4A-I","aliases":["ATP-dependent RNA helicase eIF4A-1"],"length_aa":406,"mass_kda":46.2,"function":"ATP-dependent RNA helicase which is a subunit of the eIF4F complex involved in cap recognition and is required for mRNA binding to ribosome (PubMed:20156963). 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\"Site-directed mutagenesis of recombinant eIF-4A defined functional roles for conserved DEAD-box motifs: the ATPase A motif (AXXXXGKT) is required for ATP binding; the DEAD motif couples ATP hydrolysis to RNA helicase activity; the HRIGRXXR motif is involved in ATP hydrolysis; and the SAT region is essential for RNA unwinding. Recombinant eIF-4A together with recombinant eIF-4B exhibit RNA helicase activity in vitro.\",\n      \"method\": \"In vitro reconstitution of RNA helicase activity with recombinant proteins; site-directed mutagenesis of conserved motifs; ATPase and helicase assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution combined with mutagenesis of multiple sites, rigorous biochemical assays establishing structure-function relationships\",\n      \"pmids\": [\"1378397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Dominant-negative eIF-4A mutants potently inhibit translation by blocking recycling through the eIF-4F complex. eIF-4A functions primarily as a subunit of eIF-4F rather than as a free factor; eIF-4F (not free eIF-4A) is the primary functional unit and is six-fold more effective than free eIF-4A at rescuing translation. Mutant eIF-4A also inhibits eIF-4F-dependent but not eIF-4A-dependent RNA helicase activity, indicating that eIF-4A must cycle through eIF-4F during translation.\",\n      \"method\": \"Dominant-negative mutant eIF-4A added to rabbit reticulocyte translation system; rescue experiments with eIF-4A, eIF-4F, eIF-4B; kinetic and helicase assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — functional reconstitution in a cell-free translation system with multiple orthogonal assays (translation inhibition, helicase activity, rescue experiments)\",\n      \"pmids\": [\"8131750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The central eIF4A-binding domain of mammalian eIF4G and the eIF4A-binding domain of yeast eIF4G share conserved amino acid motifs required for eIF4A interaction. Yeast eIF4G mutants defective in eIF4A binding show strongly impaired translation and growth in vivo. Mammalian eIF4A binds tightly to yeast eIF4G1, but mammalian eIF4A cannot substitute for yeast eIF4A in vivo despite high sequence conservation.\",\n      \"method\": \"Yeast genetics (temperature-sensitive mutants), in vitro binding assays, yeast in vitro translation system, rescue experiments\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — combination of in vitro binding, genetic epistasis, and in vivo functional assays in a single study\",\n      \"pmids\": [\"11256967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Plakophilin 1 (PKP1) directly associates with eIF4A1, co-purifies with eIF4A1 in cap-binding complexes, and stimulates eIF4A1 ATPase activity at the molecular level. PKP1 overexpression promotes eIF4A1 recruitment into cap-binding complexes and stimulates eIF4A1-dependent (cap- and EMCV IRES-mediated) translation but not eIF4A1-independent (HCV IRES-mediated) translation. PKP1 stimulation of translation correlates with increased cell proliferation and cell size.\",\n      \"method\": \"Co-immunoprecipitation, co-purification in cap complex, in vitro ATPase assay, IRES-dependent translation assays, overexpression/knockdown in MCF7 cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct ATPase assay plus reciprocal co-IP and functional translation assays with appropriate controls in single study\",\n      \"pmids\": [\"20156963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PHGDH (phosphoglycerate dehydrogenase) interacts with eIF4A1 and eIF4E, and this interaction facilitates assembly of the eIF4F complex on 5' mRNA structures to promote cap-dependent translation initiation in pancreatic cancer cells. PHGDH knockdown disrupts eIF4F complex assembly and inhibits translation of relevant target proteins.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, knockdown experiments with translation readout in PANC-1 cells, xenograft model\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and functional knockdown with translation phenotype, single lab, moderate methodological depth\",\n      \"pmids\": [\"30744688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hippuristanol (Hipp) binds to the carboxyl-terminal domain of eIF4A1, locks it in a closed conformation, and inhibits its RNA binding. Using CRISPR/Cas9-based variomics, functional Hipp-resistant EIF4A1 alleles were identified, linking Hipp's translation-inhibitory and cytotoxic properties directly to eIF4A1 target engagement. Genome-wide translational profiling showed that eIF4A1-dependent mRNAs are characterized by longer 5' leaders, greater overall secondary structure, and higher cytosine content.\",\n      \"method\": \"CRISPR/Cas9 variomics screen, genome-wide ribosome profiling, mRNA structural analysis, cell viability assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — CRISPR variomics directly linking alleles to target engagement, orthogonal genome-wide translation profiling in single rigorous study\",\n      \"pmids\": [\"32766783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ALC1 (chromatin remodeler) cooperates with eIF4A1 to stabilize the most abundant splicing form of CtIP mRNA, through a specific RNA sequence in the 5' UTR of CtIP. This mRNA stabilization function of eIF4A1 is independent of ALC1's chromatin-remodeling activity, representing a non-canonical role for eIF4A1 in regulating DNA end resection by controlling CtIP mRNA levels.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of ALC1 and eIF4A1, reporter assays with CtIP 5' UTR sequences, RT-PCR for mRNA stability\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP and functional knockdown data with mRNA stability readout, single lab, multiple methods\",\n      \"pmids\": [\"32392243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP15 interacts with eIF4A1 and deubiquitinates it, promoting translational efficacy in keratinocytes. USP15 knockout in mice delays wound re-epithelialization, and USP15-silenced keratinocytes show inhibited migration and proliferation. The USP15-EIF4A1 complex accelerates re-epithelialization.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, USP15 knockout mouse model, USP15 siRNA knockdown in HaCaT cells, wound healing assays, RNA-sequencing\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification plus KO mouse phenotype and functional cell assays, single lab\",\n      \"pmids\": [\"32671073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRP-derived exosomes promote wound healing via USP15, which deubiquitinates EIF4A1, stabilizing it and enhancing its function in keratinocyte proliferation and migration.\",\n      \"method\": \"In vitro CCK-8, EdU, scratch wound and transwell assays; in vivo wound healing mouse model; functional validation of USP15-EIF4A1 deubiquitination axis\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional in vitro and in vivo data supporting USP15-mediated deubiquitination of EIF4A1, corroborates independent study (PMID 32671073)\",\n      \"pmids\": [\"34422211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The marine natural product elatol specifically inhibits eIF4A1 ATPase activity in vitro, inhibits eIF4A1 helicase activity, and binds the helicase core of eIF4A1 with an unexpected 2:1 stoichiometry. Elatol-sensitive tumor cells show acute loss of translationally regulated proteins, leading to growth arrest and apoptosis.\",\n      \"method\": \"Target-based ATPase inhibition assay, helicase inhibition assay, binding/mutagenesis studies, cell-based mechanistic studies, xenograft in vivo model\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay, helicase assay, binding stoichiometry, mutagenesis, and in vivo validation in single rigorous study\",\n      \"pmids\": [\"29844128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"eIF4A1-dependent mRNAs contain AG-rich (purine-rich) motifs in their 5' UTRs that specifically activate eIF4A1 unwinding of local RNA structure. Binding of eIF4A1 to AG-rich sequences leads to multimerization of eIF4A1, with distinct subunits performing different enzymatic activities. Structural data suggest that RNA-binding by multimeric eIF4A1 induces conformational changes in RNA for optimal positioning proximal to RNA duplexes enabling efficient unwinding.\",\n      \"method\": \"In vitro RNA unwinding assays, eIF4A1 mutant analysis, structural studies, ribosome profiling, cell-based translation reporters, identification of AG-rich 5' UTR motifs\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro functional assays plus structural data and genome-wide translation profiling, multiple orthogonal methods in single study\",\n      \"pmids\": [\"36727461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"eIF4A1 preferentially binds mRNAs containing terminal oligopyrimidine (TOP) motifs in an interaction that depends on the La-related RNA-binding protein LARP1. Upon mTORC1 inhibition, eIF4A1 increases interaction between TOP mRNAs and LARP1, thereby enhancing translational repression of TOP mRNAs. Deletion of EIF4A1 attenuates translational repression of TOP mRNAs upon mTORC1 inactivation, revealing a repressive non-canonical role for eIF4A1.\",\n      \"method\": \"RNA pulldown followed by sequencing (RNA-seq), ribosome profiling, EIF4A1 deletion cell lines, mTORC1 inhibitor treatment, co-immunoprecipitation of LARP1 with TOP mRNAs\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — RNA pulldown-seq, ribosome profiling, genetic deletion, and interaction assays in a single rigorous study with orthogonal methods\",\n      \"pmids\": [\"38773334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The CRL3IBTK ubiquitin ligase complex (with IBTK as substrate-binding adaptor) interacts with eIF4A1 and catalyzes non-degradative ubiquitination of eIF4A1. This ubiquitination promotes cap-dependent translational initiation, nascent protein synthesis, and oncogene expression. mTORC1 and S6K1 directly phosphorylate IBTK to augment eIF4A1 ubiquitination, linking the mTORC1/S6K1 signaling axis to eIF4A1 activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, phosphorylation assay, IBTK knockout/knockdown, ribosome profiling, xenograft in vivo model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro ubiquitination and phosphorylation assays, co-IP, genetic knockouts with functional translation readouts, in vivo validation\",\n      \"pmids\": [\"38738857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EIF4A1 and EIF4A2 play distinct molecular roles in B cells: eIF4A1 controls global protein synthesis while eIF4A2 regulates biogenesis of 18S ribosomal RNA and the 40S ribosome subunit. EIF4A1 is essential for B-cell development and the germinal centre response; its loss impairs protein synthesis and MYC expression after B cell activation.\",\n      \"method\": \"Mouse genetic conditional knockouts (Cre-lox), ribosome profiling or polysome analysis, rRNA biogenesis assays, B cell developmental analysis by flow cytometry\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse conditional KO genetics with multiple functional readouts distinguishing eIF4A1 from eIF4A2 functions, replicated in B-cell development context\",\n      \"pmids\": [\"39516355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"EIF4A1 is essential for B cell development and the germinal centre response in mice. After B cell activation, EIF4A1 facilitates increased rates of protein synthesis, MYC expression, and expression of cell cycle regulators. EIF4A1-deficient B cells remain viable, whereas combined inhibition of EIF4A1 and EIF4A2 by Hippuristanol induces cell death.\",\n      \"method\": \"Conditional Eif4a1 knockout in B cells (mouse model), protein synthesis assays, western blotting, Hippuristanol pharmacological inhibition, germinal centre assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional genetic KO in primary mouse B cells with multiple orthogonal functional readouts\",\n      \"pmids\": [\"38011999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"eIF4A1 mediates translational regulation of the oncogene BRD2, whose 5' UTR contains the most enriched eIF4A1-binding motifs. RNA immunoprecipitation followed by RNA sequencing (RIP-seq) established this eIF4A1-BRD2 translational axis in prostate cancer cells. EIF4A1 expression is epigenetically regulated by DNA methylation at a CpG-rich island, with hypomethylation correlating with elevated EIF4A1 expression in prostate cancer.\",\n      \"method\": \"RIP-sequencing, DNMT3a CRISPR-Cas9 epigenetic targeting, EIF4A1 heterozygous knockout/knockdown, western blotting, polysome profiling implied\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq plus CRISPR-based epigenetic manipulation and KO functional assays, single lab\",\n      \"pmids\": [\"35361883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Comparative proteomic and transcriptomic analysis of eIF4A1 vs. eIF4E silencing in melanoma cells revealed that eIF4A1 and eIF4E exert common effects on translation through coding regions and 3' UTRs, while their divergent effects occur through the 5' UTR. Silencing eIF4A1 decreases melanoma proliferation and invasion, with effects on cell cycle proteins.\",\n      \"method\": \"siRNA silencing of eIF4A1/eIF4E, quantitative proteomics, RNA-seq, polysome profiling, proliferation and invasion assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal omics methods (proteomics + transcriptomics + polysome) in single study, single lab\",\n      \"pmids\": [\"27879264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"eIF4A1 knockdown in MCF7 breast cancer cells restricts cell growth and cycling. Polysome profiling defined the eIF4A1-dependent translatome, which is enriched for oncogenic mRNAs encoding G-protein constituents, cyclins, and protein kinases, and for mRNAs with G/C-rich 5' UTRs with potential to form G-quadruplexes.\",\n      \"method\": \"eIF4A1 knockdown (siRNA), polysome profiling with microarray/sequencing, cell growth and cell cycle assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling plus functional KD phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"25611378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"eIF4A1 directly binds to transgelin (Tagln) protein, preventing its ubiquitination and degradation, which leads to upregulation of p53 and promotes nuclear translocation of both Tagln and p53, resulting in cardiomyocyte apoptosis during ischemia/reperfusion injury. Cardiomyocyte-specific eIF4A1 knockout attenuates cardiomyocyte apoptosis and reduces infarct area in mice.\",\n      \"method\": \"Co-immunoprecipitation, cardiomyocyte-specific knockout mouse model (myocardial I/R model), overexpression/knockdown, ubiquitination assays, nuclear fractionation, western blot\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus cardiomyocyte-specific KO with functional phenotypes, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39856433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"eIF4A1/2 acts as an RNA chaperone during mitotic exit to enable chromatin decondensation. In a cell-free condensation assay, eIF4A1/2 is crucial for chromatin decondensation, relying on its RNA-binding ability but not its ATPase activity. Reducing eIF4A1/2 levels slows chromatin decondensation during nuclear reformation, while increasing eIF4A1/2 concentration on mitotic chromosomes accelerates decondensation. eIF4A1/2 dissociates biomolecular condensates of RNA and perichromatin proteins in vitro, regulating the composition and fluidity of the perichromatin layer.\",\n      \"method\": \"Cell-free chromatin condensation assay, live cell imaging, eIF4A1/2 knockdown, overexpression targeting mitotic chromosomes, in vitro condensate dissolution assay, ATPase-dead mutant analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — cell-free reconstitution assay plus live imaging, knockdown and gain-of-function, ATPase mutant, and in vitro condensate assays in single rigorous study\",\n      \"pmids\": [\"40069174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGF2BP2 (m6A reader) recruits EIF4A1 to promote the translation initiation of CDK6 mRNA in an m6A-dependent manner, increasing CDK6 protein levels at the level of translation rate rather than mRNA stability. This IGF2BP2-EIF4A1-CDK6 axis drives G1/S cell cycle progression in triple-negative breast cancer.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation, polysome fractionation, mRNA stability assay, siRNA knockdown, overexpression in TNBC cell lines\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP, RIP, and polysome assays supporting translation mechanism, single lab\",\n      \"pmids\": [\"37983610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"eIF-4A interacts with specific cis-acting regulatory elements in the 5' UTR of human asparagine synthetase mRNA (spanning -60 to -120 bases from the initiation codon). A 46 kDa trans-acting protein identified as eIF-4A by immunoprecipitation with anti-eIF-4A monoclonal antibody was shown to protect these elements from T1 RNase digestion.\",\n      \"method\": \"T1 RNase footprinting, hybrid arrest translation, immunoprecipitation with monoclonal anti-eIF-4A antibody\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — footprinting and immunoprecipitation identifying specific mRNA interaction, single lab, limited mechanistic depth\",\n      \"pmids\": [\"8093451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"X-ray crystal structure of an amidino-rocaglate (ADR) in complex with eIF4A1, AMPPNP, and poly r(AG)5 RNA at 1.69 Å resolution shows that rocaglates clamp eIF4A1 onto polypurine RNA. ADR binding pose is similar to rocaglamide A (RocA), but its rigidified scaffold is preorganized in an eIF4A1-RNA binding-competent conformation, avoiding entropic penalties and improving potency.\",\n      \"method\": \"X-ray crystallography (1.69 Å resolution), computational modeling\",\n      \"journal\": \"ACS omega\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution X-ray crystal structure with computational validation of mechanism, single study\",\n      \"pmids\": [\"39989799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BLF1 (Burkholderia lethal factor 1 toxin) modulates eIF4A1 ATPase activity. eIF4A1 has higher ATP-binding affinity (lower Km) than eIF4A2. Leucine 98 (L98) and alanine 100 (A100) play important roles in the ATPase activities of eIF4A isoforms, as revealed by N-terminal domain swapping and single amino acid mutations.\",\n      \"method\": \"In vitro ATPase assay, domain swapping, site-directed mutagenesis, temperature/pH/Mg2+ sensitivity assays\",\n      \"journal\": \"Toxins\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic assays with mutagenesis, single lab, novel finding but limited independent replication\",\n      \"pmids\": [\"40423315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"P7C3 compound directly binds eIF4A1 (identified by CETSA-mass spectrometry and protein microarray), inhibits eIF4A1-mediated global protein synthesis (including c-Myc), and disrupts autophagic flux by downregulating ULK1 in hepatic stellate cells. eIF4A1 knockdown mimics P7C3 effects on fibrotic markers.\",\n      \"method\": \"Cellular thermal shift assay (CETSA) coupled with mass spectrometry, protein microarray, molecular docking, eIF4A1 knockdown/overexpression, protein synthesis assay, autophagic flux assay\",\n      \"journal\": \"Archives of pharmacal research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — CETSA-MS target identification plus functional knockdown/overexpression, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41761033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"EIF4A1 inhibition by eFT226 significantly reduces tumor growth in intrahepatic cholangiocarcinoma PDX models. Zotatifin (eIF4A1 inhibitor) decreases glycolysis of iCCA cells without affecting mitochondrial respiration and shows synergistic apoptosis when combined with Bcl-xl inhibitors.\",\n      \"method\": \"PDX in vivo tumor model, patient-derived organoids, cell line inhibition assays, metabolic flux assays, combination drug apoptosis assays\",\n      \"journal\": \"JHEP reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo PDX model plus organoid and metabolic assays, single lab, multiple model systems\",\n      \"pmids\": [\"40529213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mechanistic characterization of eIF4A1 inhibitors revealed two distinct eIF4A1 functions linked to distinct mRNA 5' UTR features: C/CG-rich 5' UTRs require efficient mRNA loading by eIF4F (specifically targeted by hippuristanol), while AG-rich motifs plus alternative start sites direct eIF4A1 to start site selection (specifically perturbed by eFT226/zotatifin). These findings were validated by massively parallel reporter assay.\",\n      \"method\": \"Biochemical inhibitor characterization (hippuristanol vs. eFT226), machine learning model of mRNA features, massively parallel reporter assay (MPRA), ribosome profiling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical and genome-scale functional assays with MPRA validation; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"EIF4A1 is an ATP-dependent DEAD-box RNA helicase that functions as the catalytic subunit of the eIF4F cap-binding complex, unwinding secondary structures in mRNA 5' UTRs (particularly those with AG-rich or C/CG-rich motifs) to facilitate 43S pre-initiation complex loading and ribosomal scanning toward the start codon; its helicase activity requires the DEAD motif for coupling ATP hydrolysis to unwinding, the SAT region for RNA strand separation, and the HRIGRXXR region for ATP hydrolysis, and is stimulated by multimerization on AG-rich RNA sequences, regulated by binding partners (eIF4G, PKP1, LARP1) and post-translational modifications (non-degradative ubiquitination by CRL3IBTK downstream of mTORC1/S6K1 signaling, and deubiquitination by USP15), and additionally serves as an RNA chaperone during mitotic exit to dissolve perichromatin condensates enabling chromatin decondensation through its RNA-binding activity independent of ATPase function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EIF4A1 is an ATP-dependent DEAD-box RNA helicase that serves as the engine of cap-dependent translation initiation by unwinding structured 5' UTRs to permit ribosomal scanning [#0, #1]. Mutagenesis of recombinant eIF-4A established that its conserved motifs partition catalysis: the ATPase A motif binds ATP, the DEAD motif couples ATP hydrolysis to unwinding, the HRIGRXXR motif performs hydrolysis, and the SAT region executes RNA strand separation [#0]. eIF4A1 functions principally as a subunit of the eIF4F complex rather than as a free factor, cycling through eIF4F during each round of initiation [#1] via a conserved central binding interface on eIF4G [#2]. Its helicase activity is stimulated by binding partners that promote eIF4F assembly and ATPase output, including PKP1 [#3] and PHGDH [#4], and is further activated by multimerization on AG-rich (purine-rich) 5'-UTR motifs, where distinct subunits perform separable enzymatic steps to reposition RNA for efficient unwinding [#10]. eIF4A1-dependent mRNAs are characterized by long, structured, C/CG-rich or G-quadruplex-prone 5' leaders [#5, #17], and inhibitor studies dissect two activities—eIF4F-mediated mRNA loading versus start-site selection—linked to C/CG-rich versus AG-rich UTR features [#26]. The factor is preferentially required for translation of oncogenic mRNAs encoding cyclins, kinases, MYC, BRD2 and CDK6, driving proliferation and cell-cycle progression across cancer contexts [#15, #16, #17, #20] and is essential for B-cell development and germinal-centre responses through control of global protein synthesis [#13, #14]. eIF4A1 activity is regulated post-translationally by non-degradative ubiquitination via the CRL3-IBTK ligase downstream of mTORC1/S6K1 signaling [#12] and by USP15-mediated deubiquitination, which stabilizes it to support keratinocyte proliferation and wound re-epithelialization [#7, #8]. Beyond canonical initiation, eIF4A1 has non-canonical RNA-handling roles: it stabilizes CtIP mRNA to regulate DNA end resection [#6], represses TOP-mRNA translation in concert with LARP1 upon mTORC1 inactivation [#11], and acts as an RNA chaperone during mitotic exit to dissolve perichromatin condensates and enable chromatin decondensation, a function dependent on RNA binding but not ATPase activity [#19]. eIF4A1 is the target of multiple chemically distinct inhibitors—hippuristanol, elatol, and rocaglate/amidino-rocaglate compounds that clamp it onto polypurine RNA—which abrogate translation and tumor growth [#5, #9, #22, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the catalytic logic of eIF4A1 by assigning discrete functions to conserved DEAD-box motifs, defining how ATP binding, hydrolysis, and RNA unwinding are mechanically coupled.\",\n      \"evidence\": \"In vitro reconstitution of helicase activity with recombinant eIF-4A/eIF-4B plus site-directed mutagenesis of conserved motifs\",\n      \"pmids\": [\"1378397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how the helicase operates within the intact eIF4F complex in cells\", \"No structural model of the catalytic cycle\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Provided early evidence that eIF4A1 contacts specific cis-regulatory 5'-UTR elements, foreshadowing its sequence/structure-selective roles.\",\n      \"evidence\": \"T1 RNase footprinting and immunoprecipitation on human asparagine synthetase mRNA 5' UTR\",\n      \"pmids\": [\"8093451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited mechanistic depth; binding specificity determinants not defined\", \"Functional consequence for translation not directly tested\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Resolved whether eIF4A1 acts free or complexed, showing eIF4F is the primary functional unit and that eIF4A1 must cycle through eIF4F during translation.\",\n      \"evidence\": \"Dominant-negative eIF-4A in rabbit reticulocyte lysate with rescue and helicase assays\",\n      \"pmids\": [\"8131750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the cycling mechanism not resolved\", \"Stoichiometry of eIF4A within eIF4F in vivo not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the conserved eIF4A-binding interface on eIF4G as essential for translation in vivo, while revealing species-specific functional incompatibility.\",\n      \"evidence\": \"Yeast genetics, in vitro binding, and rescue experiments comparing mammalian and yeast eIF4A/eIF4G\",\n      \"pmids\": [\"11256967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the incompatibility unresolved\", \"Did not address regulation of the interaction\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified PKP1 as a direct activator of eIF4A1 ATPase and eIF4F recruitment, linking eIF4A1 stimulation to proliferation and cell size.\",\n      \"evidence\": \"Co-IP, cap-complex co-purification, in vitro ATPase and IRES-dependent translation assays in MCF7 cells\",\n      \"pmids\": [\"20156963\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PKP1 modulates target-mRNA selectivity not addressed\", \"Structural mode of ATPase stimulation unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the eIF4A1-dependent translatome, showing preferential dependence of oncogenic, G/C-rich, G-quadruplex-prone mRNAs.\",\n      \"evidence\": \"siRNA knockdown plus polysome profiling and cell-cycle assays in MCF7 cells\",\n      \"pmids\": [\"25611378\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between G-quadruplex unwinding and translation not directly demonstrated\", \"Single cell-line context\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Separated the shared versus divergent regulatory contributions of eIF4A1 and eIF4E, localizing eIF4A1-specific effects to the 5' UTR.\",\n      \"evidence\": \"Parallel siRNA silencing with quantitative proteomics, RNA-seq, and polysome profiling in melanoma cells\",\n      \"pmids\": [\"27879264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis of 5'-UTR-specific divergence not resolved\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Validated eIF4A1 as a druggable target with elatol, demonstrating direct ATPase/helicase inhibition and an unexpected 2:1 binding stoichiometry.\",\n      \"evidence\": \"In vitro ATPase/helicase assays, binding/mutagenesis, and xenograft model\",\n      \"pmids\": [\"29844128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of 2:1 stoichiometry not defined\", \"Selectivity over eIF4A2 not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Pinned down the molecular and structural features dictating eIF4A1 dependence and target engagement, defining hippuristanol's mechanism and the structured/C-rich nature of dependent mRNAs.\",\n      \"evidence\": \"CRISPR/Cas9 variomics, genome-wide ribosome profiling, and mRNA structural analysis\",\n      \"pmids\": [\"32766783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how conformational locking translates to translatome changes mechanistically\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a non-canonical eIF4A1 function in mRNA stabilization, linking it to DNA end resection independently of helicase initiation activity.\",\n      \"evidence\": \"Co-IP, siRNA knockdown of ALC1/eIF4A1, and CtIP 5'-UTR reporter and RT-PCR stability assays\",\n      \"pmids\": [\"32392243\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ATPase activity is required not tested\", \"Direct RNA contact vs. complex-mediated effect not distinguished\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified USP15 as a deubiquitinase of eIF4A1 that stabilizes it to promote translation and wound re-epithelialization, establishing reversible ubiquitin control.\",\n      \"evidence\": \"Co-IP/MS, USP15 knockout mouse, keratinocyte knockdown, and wound-healing assays; corroborated by PRP-exosome study\",\n      \"pmids\": [\"32671073\", \"34422211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The cognate ubiquitin ligase opposing USP15 not identified here\", \"Ubiquitin site(s) not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mechanistically defined how AG-rich motifs drive eIF4A1 multimerization, with distinct subunits performing different enzymatic steps to reposition RNA for unwinding.\",\n      \"evidence\": \"In vitro unwinding assays, mutant analysis, structural studies, and ribosome profiling\",\n      \"pmids\": [\"36727461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise architecture and stoichiometry of the active multimer not fully resolved\", \"Coupling to scanning in vivo not directly visualized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a repressive non-canonical role: eIF4A1 promotes LARP1-dependent binding of TOP mRNAs to repress their translation upon mTORC1 inhibition.\",\n      \"evidence\": \"RNA pulldown-seq, ribosome profiling, EIF4A1 deletion, and LARP1 co-IP under mTORC1 inhibition\",\n      \"pmids\": [\"38773334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether helicase catalysis is required for repression not resolved\", \"Structural basis of TOP-motif recognition unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected mTORC1/S6K1 signaling to eIF4A1 activity through CRL3-IBTK-mediated non-degradative ubiquitination that enhances cap-dependent initiation and oncogene expression.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination/phosphorylation assays, IBTK knockout, ribosome profiling, and xenograft\",\n      \"pmids\": [\"38738857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ubiquitination biochemically alters helicase/eIF4F activity not defined\", \"Ubiquitin acceptor lysines not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Distinguished eIF4A1 from eIF4A2 in vivo, showing eIF4A1 controls global synthesis and is essential for B-cell development and germinal-centre responses.\",\n      \"evidence\": \"Mouse conditional knockouts with ribosome/polysome and rRNA biogenesis assays; Hippuristanol co-inhibition\",\n      \"pmids\": [\"39516355\", \"38011999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional redundancy with eIF4A2 in non-immune tissues not fully mapped\", \"Target-mRNA sets distinguishing the isoforms incompletely defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed eIF4A1 can be recruited to specific mRNAs by RNA-binding adaptors (IGF2BP2) for m6A-dependent translation of CDK6, expanding modes of selective recruitment.\",\n      \"evidence\": \"Co-IP, RIP, polysome fractionation, and stability assays in TNBC cell lines\",\n      \"pmids\": [\"37983610\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. bridged eIF4A1-mRNA contact not resolved\", \"Generality beyond CDK6 untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established an ATPase-independent RNA-chaperone function for eIF4A1 in dissolving perichromatin condensates to drive chromatin decondensation at mitotic exit.\",\n      \"evidence\": \"Cell-free condensation assay, live imaging, knockdown/gain-of-function, and ATPase-dead mutant analysis\",\n      \"pmids\": [\"40069174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How eIF4A1 is targeted to mitotic chromosomes not defined\", \"Relationship to its translation role mechanistically unconnected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided high-resolution structural insight into how rocaglate-class compounds clamp eIF4A1 onto polypurine RNA, rationalizing inhibitor potency.\",\n      \"evidence\": \"X-ray crystal structure of an amidino-rocaglate with eIF4A1, AMPPNP, and poly r(AG)5 at 1.69 Å\",\n      \"pmids\": [\"39989799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of apo or eIF4F-embedded eIF4A1 not provided here\", \"Does not address multimeric assembly on AG-rich RNA\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended therapeutic targeting of eIF4A1 to cholangiocarcinoma and fibrosis models, linking inhibition to reduced glycolysis, MYC loss, autophagic disruption, and tumor regression.\",\n      \"evidence\": \"PDX and organoid models with eFT226/zotatifin; CETSA-MS target ID and knockdown with P7C3 in hepatic stellate cells\",\n      \"pmids\": [\"40529213\", \"41761033\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"On-target specificity versus off-target effects of new compounds not fully resolved\", \"Mechanistic basis of metabolic and autophagy effects incompletely defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mapped isoform-specific ATPase determinants and showed eIF4A1's higher ATP affinity over eIF4A2, also identifying a bacterial toxin (BLF1) that modulates its ATPase.\",\n      \"evidence\": \"In vitro ATPase assays with N-terminal domain swapping and L98/A100 point mutations\",\n      \"pmids\": [\"40423315\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, limited replication\", \"Physiological relevance of BLF1 modulation in human cells untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How eIF4A1's distinct canonical (mRNA loading vs. start-site selection), repressive (LARP1/TOP), mRNA-stabilizing, and ATPase-independent chaperone functions are coordinated within a single protein, and how ubiquitination biochemically reconfigures its activity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified structural framework linking helicase, multimerization, and chaperone modes\", \"Ubiquitin acceptor sites and their effect on catalysis unmapped\", \"Mechanism directing eIF4A1 to non-translation roles (chromatin, mRNA stability) unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 1, 3, 9, 23]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [10, 11, 19, 21, 22]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 9, 10]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [1, 11, 16, 17]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 9, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72613\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 3, 12, 13]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [17, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 16, 25]}\n    ],\n    \"complexes\": [\n      \"eIF4F cap-binding complex\",\n      \"CRL3-IBTK ubiquitin ligase complex\"\n    ],\n    \"partners\": [\n      \"EIF4G\",\n      \"EIF4E\",\n      \"PKP1\",\n      \"PHGDH\",\n      \"LARP1\",\n      \"USP15\",\n      \"IBTK\",\n      \"IGF2BP2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}