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| BAI1 Protein |
|---|
| Protein Name | Brain-specific angiogenesis inhibitor 1 |
| Gene | [BAI1](/genes/bai1) |
| UniProt ID | [Q9UKF6](https://www.uniprot.org/uniprot/Q9UKF6) |
| PDB Structure | Not determined |
| Molecular Weight | ~170 kDa |
| Subcellular Localization | Plasma membrane |
| Protein Family | BAI family (adhesion GPCR) |
BAI1 Protein is a protein encoded by the BAI1 gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
BAI1 is an adhesion G protein-coupled receptor (GPCR):
- N-terminal extracellular domain: Contains multiple protein-protein interaction motifs
- Thrombospondin type-1 repeats (TSR): Mediate anti-angiogenic activity
- 7 transmembrane domains: Characteristic of GPCRs
- C-terminal intracellular domain: Contains PDZ-binding motifs and proline-rich regions
The extracellular domain can be cleaved to generate a soluble fragment with anti-angiogenic properties.
BAI1 has several important functions in the nervous system:
- Angiogenesis regulation: Inhibits new blood vessel formation in the brain
- Synapse formation: Promotes excitatory synapse formation through neuronal adhesion
- Cell migration: Guides neuronal migration during development
- Phagocytosis: Mediates engulfment of apoptotic cells by microglia
- Neuroprotection: Provides trophic support to neurons
BAI1 is highly expressed in the brain, particularly in neurons and endothelial cells, where it regulates vascular and neuronal development.
BAI1 dysfunction contributes to neurodegenerative processes:
- Reduced BAI1 expression in AD brains correlates with vascular dysfunction
- Loss of BAI1 function may contribute to cerebral amyloid angiopathy
- Impaired synaptic BAI1 signaling affects memory formation
- Therapeutic potential of BAI1 fragments in AD being investigated
- BAI1 variants associated with PD risk in GWAS studies
- Dysregulated angiogenesis in PD substantia nigra involves BAI1
- Microglial phagocytosis defects in PD may involve BAI1
¶ Stroke and Ischemia
- BAI1 is upregulated in response to ischemic injury
- Anti-angiogenic function affects post-stroke recovery
- BAI1 fragments may protect against excitotoxic damage
- BAI1 mutations identified in ASD patients
- Synapse formation defects in ASD involve BAI1 dysfunction
Therapeutic strategies for BAI1:
- BAI1 fragments: Soluble recombinant fragments in development
- Gene therapy: AAV-mediated BAI1 expression being explored
- Small molecule agonists: Compounds that enhance BAI1 signaling
- Biomarker potential: BAI1 levels as a biomarker for neurovascular health
Categories: Proteins | GPCR Proteins | Neurodegeneration