| 1994 |
Non-phosphorylated 4E-BP1 (PHAS-I) binds directly to eIF4E and inhibits cap-dependent translation; MAP kinase phosphorylates Ser-64 of 4E-BP1, which disrupts the 4E-BP1/eIF4E interaction and relieves translational repression. |
In vitro binding assays, immobilized PHAS-I pulldown, mRNA cap affinity resin, in vitro phosphorylation by MAP kinase |
Science |
High |
7939721
|
| 1994 |
4E-BP1 (PHAS-I) is a 117 amino acid heat-stable protein that is rapidly phosphorylated in response to insulin and is expressed at highest levels in fat and skeletal muscle. |
Molecular cloning, in vitro translation, tissue expression analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
8170978
|
| 1996 |
Rapamycin blocks 4E-BP1 phosphorylation, activating 4E-BP1 and causing inhibition of cap-dependent (but not cap-independent) translation; the rapamycin-FKBP12 complex is the effector, and excess FK506 reverses this inhibition. |
In vitro translation assays, pharmacological inhibition in NIH 3T3 cells, polysome analysis |
The EMBO journal |
High |
8599949
|
| 1997 |
mTOR (FRAP) directly phosphorylates 4E-BP1 (PHAS-I) on serine and threonine residues in vitro, and this phosphorylation inhibits binding of 4E-BP1 to eIF4E; mTOR is a terminal kinase in the pathway coupling mitogenic stimulation to 4E-BP1 phosphorylation. |
In vitro kinase assays with immunoprecipitated mTOR, cell-based phosphorylation studies with rapamycin-sensitive mTOR mutants |
Science |
High |
9204908
|
| 1997 |
mTOR regulates 4E-BP1 and p70 S6 kinase in a parallel (not sequential) manner; rapamycin-resistant mTOR mutants protect both 4E-BP1 and S6K from rapamycin-induced dephosphorylation, and this protection requires an active mTOR catalytic domain. |
Expression of rapamycin-resistant mTOR mutants, in situ phosphorylation assays |
The Journal of biological chemistry |
High |
9334222
|
| 1997 |
In rat adipocytes, insulin stimulates phosphorylation of 4E-BP1 at Thr36, Thr45, Ser64, Thr69, and Ser82 (all Ser/Thr-Pro motifs), and all five sites are decreased by rapamycin; phosphorylation of Thr36 alone is insufficient for dissociation of the 4E-BP1/eIF4E complex. |
Phosphopeptide mapping by reverse-phase HPLC and Edman degradation, in vitro MAP kinase phosphorylation, cell-based studies with rapamycin |
The Journal of biological chemistry |
High |
9092573
|
| 1997 |
Heat shock causes dephosphorylation of 4E-BP1 in H35 hepatoma cells and other cell lines, which is accompanied by increased eIF4E binding to 4E-BP1 and inhibition of translation; this dephosphorylation is reversed by the phosphatase inhibitor okadaic acid. |
Phosphorylation analysis by gel shift, eIF4E pulldown, phosphatase inhibitor treatment |
The Journal of biological chemistry |
Medium |
9341116
|
| 1998 |
4E-BP1 is completely disordered in its free state (no regions of local order detectable by NMR), indicating that its binding to eIF4E is an induced-fit interaction with a completely disordered protein. |
NMR spectroscopy (double and triple resonance, steady-state NOEs) |
Protein science |
High |
9684899
|
| 1999 |
mTOR/FRAP phosphorylates 4E-BP1 on Thr-37 and Thr-46 in vitro (even when 4E-BP1 is bound to eIF4E), and these phosphorylations serve as a priming event required for subsequent phosphorylation of carboxy-terminal serum-sensitive sites; loss of these priming sites prevents downstream multi-site phosphorylation. |
In vitro kinase assays with recombinant FRAP, phosphopeptide mapping, mass spectrometry, site-directed mutagenesis |
Genes & development |
High |
10364159
|
| 1999 |
4E-BP1 exists as 8-10 phosphorylation isoforms resolvable by 2D gel electrophoresis; heat shock induces rapid dephosphorylation of 4E-BP1 concurrent with translation inhibition, and phosphatase inhibitor okadaic acid restores phosphorylation during heat shock. |
2D IEF/SDS-PAGE immunoblotting, [32P] metabolic labeling, okadaic acid treatment |
European journal of biochemistry |
Medium |
10504405
|
| 2000 |
mTOR directly phosphorylates 4E-BP1 at Thr-36/45 and (with an activating antibody) at Thr-69 and Ser-64 in vitro; phosphorylation of Thr-36/45 by mTOR facilitates subsequent Thr-69 and Ser-64 phosphorylation in an ordered hierarchy; phosphorylation of Ser-64 is most rapamycin-sensitive. |
In vitro kinase assay with immunoprecipitated mTOR, phospho-specific antibodies, rapamycin-FKBP12 inhibition |
The Journal of biological chemistry |
High |
10942774
|
| 2000 |
Cap-dependent binding of 4E-BP1 to eIF4E is enhanced ~100-fold in the presence of m7GTP; phosphorylation of 4E-BP1 weakens interaction with eIF4E regardless of cap status, and pre-formed 4E-BP1/eIF4E complexes are not dissociated by phosphorylation, suggesting regulation occurs at the free 4E-BP1 state. |
Surface plasmon resonance binding analysis |
IUBMB life |
Medium |
10772338
|
| 2001 |
4E-BP1 knockout mice have markedly smaller white fat pads; knockout males display increased metabolic rate and white adipose tissue containing multilocular brown-adipocyte-like cells expressing UCP1; translation of PGC-1α is increased in white adipose tissue of knockout mice, demonstrating 4E-BP1 as a regulator of adipogenesis and metabolism. |
Gene knockout in mice (Eif4ebp1-/-), histology, metabolic rate measurement, Western blotting, polysome analysis |
Nature medicine |
High |
11590436
|
| 2001 |
During liver regeneration after partial hepatectomy in rats, 4E-BP1 phosphorylation is induced in a rapamycin-insensitive manner, demonstrating that mTOR-independent kinases can phosphorylate 4E-BP1 in vivo. |
Partial hepatectomy rat model, phospho-specific antibodies, rapamycin treatment |
The Journal of biological chemistry |
Medium |
11278364
|
| 2002 |
Phosphorylation events govern the proapoptotic potency of 4E-BP1; phosphorylation site mutants of 4E-BP1 that more strongly repress cap-dependent translation are more potently proapoptotic; at maximum translational repression, cap-independent (IRES-dependent) translation is activated, reducing apoptosis. |
Expression of phosphorylation site mutants, cap-dependent vs. IRES-dependent translation reporters, apoptosis assays |
Molecular and cellular biology |
High |
11909977
|
| 2003 |
Both the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 are required for efficient in vitro phosphorylation by mTOR and for binding to Raptor; raptor overexpression enhances phosphorylation of wild-type but not motif-mutant 4E-BP1, indicating Raptor serves as a docking scaffold for 4E-BP1 phosphorylation by mTOR. |
In vitro mTOR kinase assay with recombinant PHAS-I mutants, co-immunoprecipitation with HA-tagged raptor, mutagenesis |
The Journal of biological chemistry |
High |
12665511
|
| 2003 |
A functional TOS motif in 4E-BP1 is required for binding to Raptor, for efficient in vitro phosphorylation by mTOR/Raptor complex, and for phosphorylation at all mTOR-regulated sites in vivo; TOS motif mutation (F114A) causes reduced cell size, demonstrating TOS-dependent mTOR/Raptor-mediated regulation of cell growth. |
Co-immunoprecipitation, in vitro mTOR/raptor kinase assay, site-directed mutagenesis, cell size measurement |
Current biology |
High |
12747827
|
| 2003 |
Ser-64 and Ser-111 are not required for insulin-stimulated dissociation of 4E-BP1 from eIF4E; Thr-36/45 phosphorylation is implicated as the primary determinant of 4E-BP1/eIF4E dissociation. |
Mutagenesis (Ala-64 and Ala-111 mutants), in situ phosphorylation analysis, eIF4E binding assay |
The Journal of biological chemistry |
High |
14507920
|
| 2004 |
4E-BP1 binds to the eIF4E homologous protein 4EHP via its canonical eIF4E-binding motif (Y54 and L59 required); 4EHP overexpression creates a negative feedback loop inhibiting upstream signaling to 4E-BP1 and S6K1, and this feedback requires the 4E-BP1-binding capability of 4EHP. |
Co-immunoprecipitation, site-directed mutagenesis of 4E-BP1 and 4EHP binding interfaces |
FEBS letters |
Medium |
15094042
|
| 2008 |
SR protein SF2/ASF promotes translation initiation of bound mRNAs by suppressing 4E-BP1 activity; SF2/ASF interacts with both mTOR and the phosphatase PP2A to regulate 4E-BP1 phosphorylation, functioning as an adaptor to recruit translation regulatory molecules to specific mRNAs. |
Co-immunoprecipitation, translation reporter assays, mTOR/PP2A interaction studies |
Molecular cell |
High |
18439897
|
| 2008 |
ATF4 directly transcriptionally induces 4E-BP1 expression under ER stress; elevated 4E-BP1 in pancreatic beta cells under ER stress is required for cell survival; Eif4ebp1 deletion increases susceptibility to ER stress-mediated apoptosis and accelerates beta cell loss in diabetic mouse models. |
Chromatin IP, 4E-BP1 promoter-reporter assay, Eif4ebp1 knockout mouse, MIN6 beta cell knockdown, diabetic mouse models |
Cell metabolism |
High |
18316032
|
| 2002 |
UVB irradiation induces 4E-BP1 phosphorylation at Thr-36, Thr-45, Ser-64, and Thr-69 via the p38/MSK1 pathway (not PI3K/Akt); dominant-negative p38 and MSK1 block UVB-induced 4E-BP1 phosphorylation and eIF4E release. |
Dominant-negative kinase expression, pharmacological inhibitors (p38 inhibitors, wortmannin, H89), in vivo phosphorylation assays |
The Journal of biological chemistry |
High |
11777913
|
| 2009 |
4E-BP1 is a transcriptional target of Smad4; TGFβ-stimulated Smad4 enhances 4E-BP1 gene-promoter activity through a conserved Smad-binding element; 4E-BP1 is required for TGFβ-mediated antiproliferative effects. |
Smad4 ChIP, 4E-BP1 promoter-reporter assay, siRNA knockdown, 4E-BP1 knockout MEFs, Smad4+/+ vs Smad4-/- cell lines |
The EMBO journal |
High |
19834456
|
| 2010 |
mTORC1 ablation in mouse myocardium causes fatal dilated cardiomyopathy with 4E-BP1 accumulation; simultaneous ablation of 4E-BP1 together with mTOR markedly improves cardiac apoptosis, heart function, and survival, demonstrating that 4E-BP1 mediates the deleterious effects of reduced mTOR activity in the heart. |
Cardiac-specific Mtor knockout mouse, double knockout of Mtor and Eif4ebp1, histology, echocardiography, survival analysis |
The Journal of clinical investigation |
High |
20644257
|
| 2010 |
Non-phosphorylated 4E-BP1 interacts with p21 protein and induces its proteasomal degradation; mTORC1 activation phosphorylates 4E-BP1, preventing this p21-destabilizing interaction and thereby stabilizing p21 protein in HNSCC cells. |
Co-immunoprecipitation, Western blotting with phospho-4E-BP1 mutants, siRNA knockdown |
Nature communications |
Medium |
26832959
|
| 2010 |
4E-BP1 and ERK pathways converge to regulate cap-dependent translation via 4E-BP1; both AKT and ERK pathways independently regulate 4E-BP1 phosphorylation, and their combined inhibition is required to fully suppress translation in tumors with co-activation of both pathways; knockdown of 4E-BP1 reduces dependence on AKT/ERK signaling. |
siRNA knockdown, dominant-active 4E-BP1 mutant, inhibitor combinations, polysome profiling |
Cancer cell |
High |
20609351
|
| 2010 |
The disorder-to-order transition of 4E-BP1 is required for tight eIF4E binding; phosphorylation of S65 destabilizes the α-helical conformation of the 4E-BP1 binding motif, biasing the free energy landscape toward the unfolded state that cannot bind eIF4E. |
Isothermal calorimetry, circular dichroism, NMR, computational modeling |
Proceedings of the National Academy of Sciences of the United States of America |
High |
20880835
|
| 2011 |
MCV small T antigen acts downstream of mTORC1 to maintain 4E-BP1 hyperphosphorylation and dysregulated cap-dependent translation; MCV sT-induced hyperphosphorylation of 4E-BP1 Ser65 is resistant to mTORC1/mTORC2 inhibitors; constitutively active non-phosphorylatable 4E-BP1 antagonizes MCV sT transformation. |
Dominant-active 4E-BP1 mutant expression, mTORC1/2 inhibitor treatment, cell transformation assays |
The Journal of clinical investigation |
High |
21841310
|
| 2012 |
4E-BP1 co-localizes with PLK1 at centrosomes during mitosis; 4E-BP1 interacts directly with PLK1 in vitro and in vivo via its C-terminal aa 77-118; PLK1 phosphorylates 4E-BP1 in vitro; 4E-BP1 depletion causes polyploidy, chromosomal misalignment, multi-polar spindles, and sensitizes cells to paclitaxel. |
Co-immunoprecipitation, in vitro kinase assay with PLK1, siRNA knockdown, immunofluorescence co-localization |
Cell cycle |
Medium |
22918237
|
| 2012 |
Phosphorylation at Thr46 alone (rapamycin-insensitive) is sufficient to prevent eIF4E:4E-BP1 binding, establishing that the initial rapamycin-insensitive mTORC1 phosphorylation at Thr46 directly regulates the 4E-BP1/eIF4E interaction. |
Site-directed mutagenesis of 4E-BP1, eIF4E co-immunoprecipitation, rapamycin and mTOR kinase inhibitor treatment |
F1000Research |
Medium |
24358826
|
| 2013 |
mTOR/4E-BP1 signaling in the suprachiasmatic nucleus (SCN) is rhythmically regulated; 4E-BP1 preferentially represses VIP mRNA translation; Eif4ebp1 knockout mice display accelerated re-entrainment to shifted light/dark cycles and are more resistant to constant light-induced rhythm disruption; Mtor+/- mice show decreased VIP expression and increased susceptibility to constant light. |
Eif4ebp1 knockout mouse, Mtor heterozygous mouse, VIP immunoassay, circadian behavior analysis, mTOR inhibitor treatment |
Neuron |
High |
23972597
|
| 2013 |
O-GlcNAcylation of 4E-BP1 in hyperglycemic conditions enhances its interaction with eIF4E and causes a shift from cap-dependent to cap-independent mRNA translation; this glucose-induced translational shift does not occur in 4E-BP1-deficient cells. |
4E-BP1 knockout cells, bicistronic luciferase reporter assay, pulsed SILAC proteomics, phlorizin treatment of STZ-diabetic mice |
Diabetes |
High |
23434932
|
| 2013 |
Phosphorylated EIF4EBP1 localizes to the spindle apparatus in mouse oocytes during meiosis in a phosphorylation-site-specific manner: Ser65-phosphorylated 4E-BP1 localizes at spindle poles, Thr70-phosphorylated 4E-BP1 localizes on the spindle; CDK1 and mTOR are the main positive regulators after nuclear envelope breakdown; expression of dominant-negative 4E-BP1 causes spindle abnormality. |
Immunofluorescence, Western blotting, CDK1 and mTOR inhibitors, dominant-negative 4E-BP1 expression, mouse oocyte maturation model |
Genetics |
Medium |
23852387
|
| 2015 |
The 2.1-Å crystal structure of mouse eIF4E complexed with m7GTP and a 4E-BP1 fragment (residues 50-84) reveals two binding motifs: the canonical YXXXXLΦ motif and a proline-turn-helix extension containing S65 and T70 phosphorylation sites; a C-terminal motif (motif 3) is critical for 4E-BP1-mediated cell cycle arrest and partially overlaps with the 4EGI-1 binding site. |
X-ray crystallography at 2.1 Å, cell cycle arrest assays with 4E-BP1 truncation mutants |
Proceedings of the National Academy of Sciences of the United States of America |
High |
26170285
|
| 2015 |
Enhanced 4E-BP1 activity in mouse skeletal muscle protects against age- and diet-induced insulin resistance and metabolic decline; 4E-BP1-mediated metabolic protection occurs through increased translation of PGC-1α and enhanced mitochondrial respiratory function; skeletal muscle 4E-BP1 also promotes FGF21 secretion preserving brown adipose tissue. |
Muscle-specific 4E-BP1 transgenic mice, metabolic rate measurements, polysome/translation assays, adipose tissue phenotyping |
The Journal of clinical investigation |
High |
26121750
|
| 2017 |
Snail transcriptionally represses 4E-BP1 by binding to three E-boxes in the human 4E-BP1 promoter; Snail overexpression promotes cap-dependent translation and reduces sensitivity to mTOR kinase inhibitors; pharmacological inhibition of Snail restores 4E-BP1 expression and sensitizes cancer cells to mTOR inhibitors. |
Chromatin IP, promoter-reporter assay, Snail overexpression and knockdown, polysome profiling, tumor xenograft |
Nature communications |
High |
29263324
|
| 2017 |
In mouse oocytes, 4E-BP1 undergoes meiosis-resumption-dependent phosphorylation by CDK1 and mTOR (but not PLK1); CDK1 promotes 4E-BP1 phosphorylation via phosphorylation and activation of mTOR; dominant-negative 4E-BP1 impairs translation and causes spindle abnormalities; this mTOR regulatory pathway is also present in human oocytes. |
Immunofluorescence in mouse/human oocytes, CDK1/PLK1/mTOR inhibitors, dominant-negative 4E-BP1 expression, cumulus cell comparison |
Cell cycle |
High |
28272965
|
| 2018 |
lncRNA H19 directly interacts with 4E-BP1 at its TOS motif and competitively inhibits 4E-BP1 binding to Raptor, thereby blocking mTORC1-mediated 4E-BP1 phosphorylation without affecting S6K1 activation. |
RNA immunoprecipitation, co-immunoprecipitation of H19/4E-BP1/Raptor, TOS motif competition assay, 4E-BP1 phosphorylation analysis |
Nature communications |
High |
30397197
|
| 2019 |
CDK12 phosphorylates 4E-BP1 at S65 and T70 (Ser-Pro sites); prior mTORC1 phosphorylation at T37/T46 facilitates CDK12 phosphorylation; CDK12-dependent 4E-BP1 phosphorylation controls exchange of 4E-BP1 with eIF4G at the 5' cap of CHK1 and other target mRNAs; CDK12 depletion causes chromosome misalignment and segregation defects. |
In vitro CDK12 kinase assay, RIP-seq, Ribo-seq, confocal imaging, mutagenesis of phosphorylation sites |
Genes & development |
High |
30819820
|
| 2019 |
rapamycin-insensitive mTORC1 signaling via 4E-BP1 (not canonical PI3K/Akt) is a critical pathway for TGF-β1-stimulated collagen synthesis in human lung fibroblasts; CRISPR-Cas9 deletion of 4E-BP1 confirms its essential role in fibrogenesis. |
CRISPR-Cas9 gene editing, mTOR inhibitors, collagen synthesis assays, precision-cut lung slices |
Nature communications |
High |
30602778
|
| 2019 |
In HNSCC, mTOR persistently restrains 4E-BP1 via phosphorylation; CRISPR/Cas9 deletion of 4E-BP1 reduces sensitivity to mTOR inhibitors both in vitro and in vivo; conditional expression of phosphorylation-resistant 4E-BP1 disrupts the translation initiation complex and prevents tumor growth. |
CRISPR-Cas9 4E-BP1 deletion, conditional phosphorylation-resistant 4E-BP1 expression, 4e-bp1/2 knockout mouse carcinogenesis models, tumor xenograft |
Cancer research |
High |
30894372
|
| 2019 |
O-GlcNAcylation of 4E-BP1 stabilizes it by slowing degradation via its PEST motif; a CUL3-containing E3 ubiquitin ligase complex binds the PEST motif to mediate 4E-BP1 polyubiquitination and turnover; O-GlcNAcylation of the PEST motif prevents this ubiquitination, increasing 4E-BP1 protein levels in diabetic retinas. |
PEST motif mutagenesis, CUL3 co-immunoprecipitation, ubiquitination assays, O-GlcNAcase inhibitor treatment, pulse-chase degradation assay |
Investigative ophthalmology & visual science |
High |
26998719
|
| 2021 |
By NMR spectroscopy, the N-terminal RAIP motif and C-terminal TOS motif of 4E-BP1 bind to separate sites on Raptor, creating avidity-based tethering; this dual tethering orients the flexible central region toward the mTORC1 kinase site; phosphorylation-induced conformational switching of 4E-BP1 explains the hierarchy of phosphorylation; mTORC1 recognizes both free and eIF4E-bound 4E-BP1. |
NMR spectroscopy of 4E-BP1 interaction with Raptor, mutagenesis, in vitro mTORC1 kinase assays |
Molecular cell |
High |
33852892
|
| 2008 |
p53 activation leads to proteasome-mediated truncation of 4E-BP1, producing a stable, hypophosphorylated, truncated form that binds eIF4E preferentially over full-length 4E-BP1, contributing to long-term inhibition of cap-dependent translation. |
Proteasome inhibitor treatment, co-immunoprecipitation, pulse-chase turnover assay, p53 activation |
Biology of the cell |
Medium |
18021075
|
| 2009 |
RhoE inhibits 4E-BP1 phosphorylation independently of mTOR (as S6K phosphorylation and mTOR/Raptor dynamics are unaffected), preventing eIF4E release from 4E-BP1 and inhibiting cap-dependent translation; eIF4E overexpression rescues both cell cycle progression and Ras-induced transformation in RhoE-expressing cells. |
RhoE overexpression, pharmacological comparisons with rapamycin, eIF4E rescue, translation reporter assays |
The Journal of biological chemistry |
Medium |
19850923
|
| 2015 |
PP2A-mediated dephosphorylation of 4E-BP1 is the dominant mechanism controlling 4E-BP1 phosphorylation status in the retina in response to inhibition of glycolysis; glycolytic inhibition dephosphorylates 4E-BP1 independently of mTORC1 through phosphatase activation. |
Ex vivo rat retina preparations, phosphatase inhibitors (okadaic acid, calyculin A, cadmium), 2-deoxyglucose, mTORC1 activity assays |
American journal of physiology. Endocrinology and metabolism |
Medium |
26199279
|
| 2019 |
4E-BP1 loss in pancreatic cancer cells leads to selective upregulation of translation of mRNAs encoding DNA replication/repair proteins (including RRM2 and CDC6), making DNA replication insensitive to mTOR inhibitors; this effect is confirmed in 4E-BP1/2-deleted mice showing increased acinar proliferation after pancreatitis. |
Genome-wide polysome profiling, 4E-BP1 depletion, 4E-BP1/2 double-knockout mouse, eIF4A inhibitor treatment |
JCI insight |
High |
31672935
|
| 2023 |
4E-BP1 stabilizes mitochondrial respiration complex III proteins (including UQCRC2) at the translational level; 4E-BP1 deficiency in human MSCs destabilizes complex III subunits, increases mitochondrial ROS, and accelerates cellular senescence; ectopic 4E-BP1 expression rescues these mitochondrial defects. |
4E-BP1 gene inactivation by CRISPR in hMSCs, ectopic expression rescue, Western blotting of respiratory complex subunits, mitochondrial respiration assays, ROS measurement |
Protein & cell |
High |
36929036
|