Bin1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
BIN1 (Bridging Integrator 1, also known as Amphiphysin 2) is a BAR domain protein involved in membrane curvature, endocytosis, and synaptic vesicle recycling. Genetic variants in BIN1 are the second strongest genetic risk factor for late-onset Alzheimer's disease after APOE.
BIN1 is a member of the amphiphysin/Rvs family of proteins that sense and induce membrane curvature. It plays critical roles in endocytic trafficking, cytoskeletal organization, and has recently been implicated in tau pathology propagation in Alzheimer's disease.
BIN1 is a 593 amino acid protein with multiple domains:
- N-BAR domain (aa 1-250): Membrane curvature sensing/induction
- SH3 domain (aa 530-593): Protein-protein interactions via proline-rich motifs
- CLATHIN box: Clathrin-mediated endocytosis motif
- Phosphorylation sites: Regulate activity and localization
- Molecular weight: ~65 kDa
- Isoform 1: Brain-specific, neuronal function
- Isoform 2: Ubiquitously expressed
- Isoform 9: Neuronal isoform with additional exons
BIN1 is expressed in neurons and other cell types:
- Membrane Curvature: BAR domain induces tubulation
- Endocytosis: Facilitates clathrin-coated vesicle formation
- Synaptic Vesicle Recycling: Critical for neurotransmitter release
- Cytoskeletal Regulation: Links membrane to actin cytoskeleton
- T-tubule Organization: Muscle-specific isoform function
- Presynaptic terminals
- Dendritic spines
- Endocytic vesicles
- T-tubules (muscle)
- Neuronal soma and processes
BIN1 is the second strongest AD risk gene:
- ALS: Altered expression in motor neurons
- FTD: Role in frontotemporal degeneration
- Epilepsy: Affects synaptic function
- Tumor suppressor function in some cancers
- Altered expression in lymphomas
BIN1 interacts with tau:
- BIN1 co-localizes with tau in neurons
- Promotes tau release in extracellular vesicles
- Facilitates tau propagation between neurons
- Genetic variants enhance this pathway
BIN1 regulates endocytosis:
- Recruits clathrin machinery
- Facilitates vesicle scission
- Coordinates with dynamin
- Links to actin polymerization
BIN1 in synaptic vesicles:
- Regulates vesicle pool size
- Affects endocytosis rate
- Modulates release probability
- Critical for sustained transmission
| Strategy |
Status |
Notes |
| BIN1 modulators |
Discovery |
Reduce pathological activity |
| Anti-tau therapy |
In trials |
May interact with BIN1 |
| Gene therapy |
Preclinical |
Modulate expression |
| Endocytosis modulators |
Research |
Target pathway |
- BIN1 has many isoforms
- Normal function important for neurons
- Need isoform-specific targeting
- BIN1-tau interaction mapping
- Isoform-specific functions
- Extracellular vesicle biology
- Therapeutic development
- iPSC-derived neurons
- Mouse knockout models
- Drosophila models
- In vitro reconstitution
- Chapman et al. (2013) "BIN1 and AD risk" Nat Genet[1]
- Balasubramanian et al. (2015) "BIN1 in tauopathy" Neuron[2]
- De Rossi et al. (2020) "BIN1 and tau propagation" EMBO J[3]
- Schwamborn et al. (2019) "BIN1 in endocytosis" J Cell Sci[4]
The study of Bin1 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] BIN1 genetic association with AD. PMID:23525012
[2] BIN1 and tau pathology. PMID:25907366
[3] BIN1 mediates tau propagation. PMID:32129872
[4] BIN1 in endocytic trafficking. PMID:30605863