4E-Binding Protein 1 (4E-BP1, encoded by EIF4EBP1) is a translational repressor that plays a central role in regulating protein synthesis via the mTOR signaling pathway. It is a key downstream effector of mTORC1 and has been implicated in various neurodegenerative diseases through its effects on synaptic plasticity, protein homeostasis, and neuronal survival.
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| Gene | [EIF4EBP1](/genes/eif4ebp1) |
|---|
| UniProt ID | Q13541 |
|---|
| PDB ID | 5TGK, 6G3L |
|---|
| Protein Family | eIF4E-binding protein family |
|---|
| Molecular Weight | ~12 kDa |
|---|
| Subcellular Localization | Cytoplasm, Nucleus |
|---|
| Expression | Ubiquitous; high in brain |
|---|
4E-BP1 is a small, natively unfolded protein with the following features:
- eIF4E-binding motif (YXXXXLΦ): Located in N-terminal region (residues 54-67)
- Phosphorylation sites: Multiple serine/threonine residues (T37, T46, S65, T70)
- C-terminal region: Less structured, involved in protein interactions
- RRM-like domain: Predicted RNA-binding capability
The phosphorylation state dramatically affects 4E-BP1's function and conformation.
In the normal nervous system, 4E-BP1 regulates:
- Cap-dependent translation: Prevents eIF4F complex formation by binding eIF4E
- Synaptic plasticity: Controls translation at synapses during LTP/LTD
- Protein homeostasis: Reduces global translation under stress
- Neuronal development: Regulates neural progenitor cell proliferation
- Memory formation: Essential for long-term memory consolidation
In AD, 4E-BP1 dysregulation contributes to:
- Impaired synaptic translation: Reduced synaptic protein synthesis [1]
- mTOR hyperactivation: Common in AD brain, leading to 4E-BP1 hyperphosphorylation [2]
- Tau pathology: mTOR/4E-BP1 pathway promotes tau phosphorylation [3]
- Memory deficits: Translational dysregulation underlies cognitive decline [4]
In PD:
- Dysregulated mTOR signaling in dopaminergic neurons
- Contributes to alpha-synuclein translation control
- Involved in mitochondrial protein homeostasis
- May affect LRRK2 pathology [5]
In ALS:
- Altered translational control in motor neurons
- Associated with TDP-43 pathology
- mTOR dysregulation contributes to proteostasis failure
- May affect stress granule dynamics [6]
In HD:
- Mutant huntingtin affects mTOR/4E-BP1 signaling
- Translational dysregulation in striatal neurons
- Contributes to synaptic protein loss
- Linked to cognitive decline [7]
- mTOR inhibitors (rapamycin, everolimus): Indirectly activate 4E-BP1
- eIF4E-4E-BP1 interaction disruptors: Novel therapeutic approach
- Translation modulators: Target cap-dependent translation
- mTOR inhibitors in clinical trials for AD
- Rapamycin being tested for neurodegenerative diseases
- Gene therapy approaches in development
| Partner |
Interaction Type |
Function |
| eIF4E |
Binding |
Translation initiation inhibition |
| mTORC1 |
Regulation |
Phosphorylation |
| PRAS40 |
Binding |
mTORC1 substrate |
| RICTOR |
Interaction |
mTORC2 regulation |
| PP1 |
Dephosphorylation |
Activity regulation |