| 2006 |
S6K1 (downstream of mTORC1/PI3K) and RSK (downstream of MAPK) both phosphorylate eIF4B on Ser422; phosphorylation of eIF4B Ser422 by both kinases increases its interaction with eIF3. PDK1 is required for both kinases to activate and phosphorylate eIF4B Ser422. |
In-cell phosphorylation assays, rapamycin treatment, PDK1 null ES cells, Co-immunoprecipitation of eIF4B with eIF3 |
The EMBO journal |
High |
16763566
|
| 2001 |
eIF4B stimulates both the initial rate and amplitude of eIF4A-dependent RNA duplex unwinding (helicase activity), making eIF4A slightly processive; stimulation magnitude depends on duplex stability and single-stranded flanking region length. |
In vitro RNA helicase unwinding assays with purified factors, kinetic analysis, chemically modified duplex substrates |
The Journal of biological chemistry |
High |
11418588
|
| 1996 |
A region rich in aspartic acid, arginine, tyrosine, and glycine (DRYG domain) mediates eIF4B self-association and direct interaction with the p170 subunit of eIF3, positioning eIF4B as an intermediary between mRNA and the 40S ribosomal subunit via eIF3. |
Far Western (protein overlay) assay, yeast two-hybrid system, in vitro and in vivo domain deletion analysis |
Molecular and cellular biology |
High |
8816444
|
| 1994 |
eIF4B contains an RNA-binding region (amino acids 367–423) that is the major contributor to RNA binding and is distinct from the RNP-CS/RRM; deletion of this region abolishes cooperation with eIF4A in RNA binding and stimulation of eIF4A helicase activity. Point mutations in the RNP-CS/RRM reduce helicase stimulation but not RNA binding cooperation with eIF4A. |
Deletion and point mutations expressed in COS cells; in vitro RNA binding assays; eIF4A helicase stimulation assay |
Molecular and cellular biology |
High |
8139536
|
| 1995 |
Yeast eIF4B ortholog Tif3 (TIF3 gene product) and mammalian eIF4B both catalyze RNA strand annealing (RNA annealing activity) in vitro in addition to stimulating translation and mRNA–ribosome binding. |
Affinity-purified recombinant Tif3-His6p; in vitro RNA annealing assay; yeast Tif3-dependent in vitro translation system |
The EMBO journal |
High |
7543843
|
| 2012 |
Yeast eIF4B (yeIF4B) binds to the head of the 40S ribosomal subunit via interaction with Rps20; the 7-repeat domain and N-terminal domain (not the RRM) are the critical functional domains; this interaction induces structural changes in the ribosomal mRNA entry channel and promotes productive eIF4A association with the 43S•mRNA PIC. |
Domain deletions tested in vitro and in vivo (yeast genetics); ribosome binding assays; structural probing of 40S changes; mRNA recruitment assays |
RNA (New York, N.Y.) |
High |
23236192
|
| 2014 |
eIF4B selectively increases the closing rate of the eIF4A conformational cycle (transition to closed state), while eIF4G increases both closing and opening rates; together eIF4B and eIF4G synergistically accelerate the eIF4A conformational cycle and RNA unwinding; the effect of eIF4B on closing rate depends on the presence of single-stranded RNA regions. |
FRET-based conformational assay monitoring eIF4A open/closed states; ATPase assays; RNA unwinding assays with purified factors |
Nucleic acids research |
High |
24848014
|
| 1991 |
eIF4F forms a stable complex (complex A) with duplex RNA in the absence of ATP; addition of eIF4B forms a slower-mobility complex (complex B); ATP-dependent unwinding occurs processively from these helicase complexes, indicating eIF4B participates in a processive helicase intermediate preceding ribosome binding. |
Gel mobility shift electrophoresis combined with RNA unwinding assays; ATP-dependent complex dissociation analysis |
Molecular and cellular biology |
High |
1719376
|
| 1997 |
Plant eIF4B binds to poly(A)-binding protein (PABP) in the absence of poly(A) RNA and increases PABP RNA binding activity by shifting its equilibrium affinity for poly(A), suggesting a role for eIF4B in mediating functional co-dependence between the 5' cap and poly(A) tail during translation. |
Far Western analysis, direct fluorescence titration, RNA binding assays, RNA mobility shift analysis |
The Journal of biological chemistry |
High |
9195926
|
| 2014 |
mTORC1/S6K1 signaling controls glutamine metabolism through eIF4B-dependent regulation of c-Myc translation: S6K1 phosphorylates eIF4B, which is required to unwind the structured 5' UTR of c-Myc mRNA and enhance its translation efficiency, thereby increasing GLS expression and glutamine flux. |
Ribosome profiling, eIF4B knockdown/rescue, phosphomimetic/phosphodeficient eIF4B mutants, polysome profiling, luciferase reporter with Myc 5'UTR |
Current biology : CB |
High |
25220053
|
| 2016 |
eIF4B has an eIF4A-independent role in translation of long mRNAs with structured 5' UTRs; ribosome profiling of yeast eIF4B deletion mutants shows eIF4B loss impairs a broader set of mRNAs than eIF4A inactivation, with little overlap, demonstrating independent functions. |
Ribosome profiling of eIF4B deletion mutants and eIF4A/Ded1 loss-of-function mutants in yeast; comparative translational efficiency analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
27601676
|
| 2018 |
eIF4B is a substrate of the deubiquitinase USP11; USP11 stabilizes eIF4B protein and enhances its activity. FASN-induced PI3K-S6K signaling phosphorylates USP11, promoting its interaction with eIF4B and thereby sustaining oncogenic translation in DLBCL. |
Co-immunoprecipitation, mass spectrometry, pharmacological inhibition, genetic knockdown/rescue in DLBCL cells |
Nature communications |
Medium |
29483509
|
| 2016 |
MELK kinase phosphorylates eIF4B at Ser406 during mitosis; this MELK-eIF4B signaling axis regulates protein synthesis specifically during mitosis, including synthesis of the antiapoptotic protein MCL1, thereby supporting cancer cell survival during cell division. |
Immunoprecipitation/mass spectrometry to identify eIF4B as MELK substrate; peptide library profiling; phospho-specific assays; MELK/eIF4B knockdown; MCL1 synthesis measurement; apoptosis assays |
Proceedings of the National Academy of Sciences of the United States of America |
High |
27528663
|
| 2013 |
Pim-1 and Pim-2 kinases directly phosphorylate eIF4B on Ser406 and Ser422; this phosphorylation is critical for Abl oncogene-driven cellular transformation; expression of phosphomimetic eIF4B confers resistance to Pim inhibitor-induced apoptosis. |
In vitro kinase assays, pharmacological inhibition (SMI-4a, imatinib), siRNA knockdown, phosphomimetic mutants, tumor xenograft assays, eIF4B-knockdown transgenic mice |
Cancer research |
High |
23749639
|
| 2012 |
p70S6K1-dependent phosphorylation of eIF4B (and PDCD4) is required for global protein synthesis downstream of mTORC1; maintenance of eIF4E–eIF4G interaction alone is insufficient to sustain global translation in the absence of mTORC1-p70S6K1 signaling to eIF4B. |
4E-BP1/2 double-knockout MEFs; pharmacological mTORC1 inhibition; polysome analysis; 35S-methionine incorporation; eIF4B and PDCD4 knockdown |
The Journal of biological chemistry |
High |
23105104
|
| 2014 |
Neuronal BC RNAs act as translational repressors by interacting with eIF4B; upon neuronal stimulation, protein phosphatase 2A (PP2A) dephosphorylates eIF4B at Ser406, reducing eIF4B–BC RNA binding affinity and enabling eIF4B to engage the 40S ribosomal subunit for translation initiation of structured mRNAs such as PKMζ. |
Co-immunoprecipitation of BC RNA with eIF4B; phospho-specific assays; PP2A pharmacological manipulation; in vitro translation assays; neuronal stimulation experiments |
The Journal of cell biology |
Medium |
25332164
|
| 2017 |
Casein kinase-mediated phosphorylation of eIF4B at Ser504 increases its recruitment to the pre-initiation complex and influences its localization at synapses; Ser504 phosphorylation modulates translation of PKMζ mRNA and is regulated by metabotropic glutamate receptor activation. |
Phospho-specific antibody generation, co-immunoprecipitation, subcellular fractionation, synaptic localization imaging, pharmacological manipulation of casein kinases and mGluRs |
Scientific reports |
Medium |
28874824
|
| 2021 |
Casein kinase 2 (CK2)-dependent phosphorylation of eIF4B controls BACE1 mRNA translation in neurons; neuronal activity promotes CK2-dependent eIF4B phosphorylation leading to increased BACE1 expression and APP processing, with eIF4B expression and phosphorylation elevated in AD mouse models and patient brains. |
CK2 inhibition, eIF4B knockdown/rescue, organotypic brain slices, AD mouse models (APPPS1, APP-KI), immunoblotting, translation reporter assays |
Cell death & disease |
Medium |
34349120
|
| 1990 |
In 3T3-L1 cells, insulin and phorbol ester (PMA/protein kinase C activation) each stimulate phosphorylation of eIF4B, demonstrating that eIF4B is a downstream phosphorylation target of both insulin signaling and PKC pathways. |
2D phosphopeptide mapping, 32P-labeling in intact cells, PMA-induced PKC downregulation to separate pathway contributions |
The Journal of biological chemistry |
Medium |
2191953
|
| 2008 |
eIF4B and eIF4H share a common, mutually exclusive binding site on eIF4A; both require AMPPNP (non-hydrolyzable ATP analog) and RNA for stable complex formation with eIF4A; the eIF4A:eIF4B and eIF4A:eIF4H complexes prefer longer RNAs (~30–33 nt) for binding than eIF4A alone (~17 nt), suggesting accessory factors extend RNA affinity beyond the footprint. |
Gel shift/RNase protection footprinting; selective RNA binding experiments; stoichiometric analysis; competition assays |
RNA (New York, N.Y.) |
High |
18719248
|
| 2013 |
Yeast eIF4B and eIF4G synergistically stimulate eIF4A RNA-dependent ATPase and RNA helicase activities; eIF4B alone does not alter eIF4A conformation, but eIF4G promotes a closed eIF4A conformation (observed for the first time) in the presence of ATP and RNA; together they jointly favor the closed eIF4A conformer. |
FRET-based conformational assays, ATPase assays, RNA helicase assays with purified yeast factors |
Journal of molecular biology |
High |
24080224
|
| 2016 |
The 7-repeat (r1-7) region of eIF4B directly binds eIF4A in the presence of RNA and ADPNP (independent of eIF4G) and is responsible for stimulating eIF4A ATPase and RNA unwinding activities and modulating the eIF4A conformational energy landscape. |
In vitro binding assays with purified proteins, FRET conformational assays, ATPase assays, RNA helicase assays with isolated domain constructs |
RNA biology |
High |
27858515
|
| 2010 |
eIF4B overexpression enhances eIF4A–eIF4G complex (eIF4F) assembly in vivo in yeast; yeIF4B promotes a conformation of the eIF4G HEAT domain conducive to stable eIF4A binding; native complexes containing eIF4G and yeIF4B but lacking eIF4A were detected, suggesting yeIF4B acts prior to eIF4A recruitment. |
Genetic suppressor screen (Ts- eIF4G HEAT mutations suppressed by yeIF4B overexpression), in vivo co-immunoprecipitation, in vitro reconstitution of eIF4A·eIF4G complexes |
The Journal of biological chemistry |
High |
23184954
|
| 1988 |
eIF4B is the 80-kDa protein that crosslinks to the m7G cap structure of eukaryotic mRNAs, demonstrating direct binding of eIF4B near the 5'-terminus of mRNA. |
UV crosslinking of eIF4B to cap-labeled mRNA; immunoprecipitation with polyclonal anti-eIF4B antibody |
Archives of biochemistry and biophysics |
Medium |
3395129
|
| 2022 |
PARK2 (Parkin E3 ubiquitin ligase) ubiquitinates eIF4B, leading to its degradation and reduced protein translation. mTORC1 phosphorylates PARK2 at Ser127, blocking its ubiquitin ligase activity toward eIF4B, thereby stabilizing eIF4B and driving enhanced translation in lymphoma cells. |
Co-IP, mutational analysis, cellular ubiquitination assays, mTORC1 inhibition, biochemical and genetic studies in DLBCL models |
Molecular cancer research : MCR |
Medium |
35105670
|
| 2021 |
eIF4B knockout in mice causes embryonic lethality with severe fetal liver damage and enhanced apoptosis; conditional knockout in adults increases mortality and susceptibility to viral infection. eIF4B-deficient mouse embryonic fibroblasts show excessive mTOR signaling activation (elevated p70S6K and 4EBP1 phosphorylation), indicating eIF4B also modulates mTOR feedback. |
Constitutive and conditional eIF4B knockout mice; histopathology; flow cytometry for apoptosis; Western blotting for mTOR pathway components; influenza A virus infection model |
Frontiers in immunology |
High |
34566982
|
| 1998 |
The RNA recognition motif (RRM) of yeast Tif3/eIF4B contains one RNA-binding domain; at least one additional RNA-binding domain is present in the C-terminal two-thirds (the seven-repeat region). The RRM domain and at least three of the seven repeat motifs are each required for RNA strand-exchange activity, in vitro translation stimulation, and in vivo complementation of tif3Δ cells. |
N- and C-terminal deletion analysis; in vivo complementation assays; in vitro translation assays; ssRNA binding assays; RNA strand-exchange assays |
RNA (New York, N.Y.) |
High |
9769100
|
| 2000 |
eIF4B increases ATP binding affinity of wheat germ eIF4A ~10-fold (without significantly altering ADP affinity), enabling eIF4A to cycle through conformational changes required for processive RNA unwinding. |
Direct fluorescence ATP/ADP binding measurements, ATPase assays, RNA helicase assays with purified wheat germ factors |
Biochemistry |
High |
10801326
|
| 2000 |
Wheat germ PABP interaction with eIF-iso4G increases the ATPase and RNA helicase activity of the (eIF4A + eIF4B + eIF-iso4F) complex; PABP enhances mRNA scanning rate of the initiation factor complex. |
ATPase kinetic assays (kcat/Km measurements), RNA helicase (duplex unwinding) assays with purified wheat germ factors in various combinations |
The Journal of biological chemistry |
Medium |
10748132
|
| 2011 |
KSHV ORF45/RSK-mediated phosphorylation of eIF4B increases its assembly into translation initiation complexes and facilitates protein translation during KSHV lytic replication; this phosphorylation is resistant to rapamycin and U0126, distinguishing it from canonical S6K and ERK/RSK pathways. |
Co-immunoprecipitation of eIF4B in initiation complexes, phospho-specific assays, siRNA knockdown of ORF45/RSK1/2, phosphorylation-deficient eIF4B mutants, viral gene expression and progeny virus production assays |
The Journal of biological chemistry |
Medium |
21994950
|
| 2025 |
eIF4F (via eIF4A and eIF4B loading eRF1 into the A site, and eIF4G1 stimulating eRF3 GTPase activity) promotes translation termination in a reconstituted mammalian system; closed-loop mRNA structure (PABP–eRF3 interaction plus eIF4F) facilitates termination. The MIF4G domain is the minimal eIF4G domain required for termination stimulation. |
Reconstituted mammalian translation termination system with purified components; domain mapping of eIF4G; measurement of eRF3 GTPase activity; peptide release assays |
Nucleic acids research |
High |
40066881
|
| 2019 |
eIF4B mediates RAN-translation of the toxic GR dipeptide from expanded G4C2 repeats in a C9orf72 ALS/FTD Drosophila model; loss-of-function of eIF4B (and eIF4H) reduces GR-GFP production and G4C2-associated toxicity. |
Unbiased loss-of-function genetic screen in Drosophila G4C2 model; GFP reporter for GR production; eye toxicity assays; validation in patient-derived cells and post-mortem ALS/FTD tissue |
Acta neuropathologica communications |
Medium |
31023341
|
| 2024 |
eIF4B IDR (intrinsically disordered region) orchestrates concentration-dependent self-association: large dynamic oligomers form before mesoscopic phase separation; this behavior is sensitive to ionic strength and molecular crowding, suggesting regulation by PTMs and binding partners. |
Single-molecule spectroscopy, molecular simulations, integration of conformational ensemble analysis; ionic strength and crowding perturbations |
Nature communications |
Medium |
39384813
|
| 2025 |
Pathogenic FTLD-tau binds eIF4B, causing its dissociation from the translation initiation complex and reducing dendritic eIF4B levels; this blocks activity-dependent local protein synthesis in dendrites and impairs synaptic plasticity. Inhibiting the tau–eIF4B interaction or increasing eIF4B levels restores local translation and plasticity. |
Co-immunoprecipitation of tau with eIF4B, ribosome profiling/translatomics in FTLD-tau neurons, dendritic localization imaging, rescue experiments with eIF4B overexpression and tau-eIF4B interaction inhibition |
bioRxivpreprint |
Medium |
41279029
|
| 2026 |
ERK2 directly phosphorylates eIF4B at Ser93; this phosphorylation decreases ubiquitination-mediated eIF4B degradation, enhances eIF4B translation activity, and facilitates translation of mesenchymal markers to promote EMT and colorectal cancer metastasis. |
Phosphoproteomic (TMT-labeling), phospho-specific antibody validation, in vitro kinase assay (ERK2 + eIF4B), ubiquitination assays, in vitro and in vivo CRC models |
Cell death & disease |
Medium |
41490890
|
| 2019 |
FLT3-ITD activates RSK1 (via MEK/ERK and PDK1), which phosphorylates eIF4B at S422 and, cooperatively with PIM kinases, at S406, activating eIF4B and mTORC1/S6K/4EBP1 to enhance cap-dependent translation and AML cell survival. |
Pharmacological inhibition (RSK, MEK, PIM, PI3K inhibitors), phospho-specific Western blotting, genetic knockdown, AML cell line proliferation and survival assays |
Cancers |
Medium |
31756944
|