Dab1 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.
DAB1 (Disabled-1) is a critical intracellular adaptor protein that plays a central role in the Reelin signaling pathway, one of the most important cascades governing neuronal migration, cortical lamination, and synaptic plasticity in the developing and adult brain. DAB1 serves as the primary intracellular effector of the large extracellular glycoprotein Reelin, translating extracellular guidance cues into intracellular signaling events that regulate cytoskeletal dynamics, cell adhesion, and synaptic function. The DAB1 gene is essential for proper brain development, and its dysfunction has been implicated in various neurological disorders including Alzheimer's disease, schizophrenia, and epilepsy. [1]
| Property | Value | [2]
|----------|-------| [3]
| Protein Name | Disabled-1 | [4]
| Gene Symbol | DAB1 | [5]
| UniProt ID | Q9UHQ2 | [6]
| Molecular Weight | ~82 kDa (625 amino acids) | [7]
| Isoforms | Multiple isoforms (DAB1-001, DAB1-002) |
| Domain Architecture | PTB domain, Proline-rich region, Multiple tyrosine phosphorylation sites |
| Subcellular Localization | Cytoplasm, Postsynaptic densities, Growth cones |
| Protein Family | Disabled family (PFAM: PF03131) |
DAB1 contains several functionally distinct domains:
N-terminal PTB domain (Phosphotyrosine-binding domain): Binds to the cytoplasmic tail of ApoER2 and VLDLR receptors. Unlike classical PTB domains, DAB1's PTB binds to NPXY motifs in an phosphorylation-independent manner.
Proline-rich region: Contains multiple PXXP motifs that serve as SH3 domain binding sites, enabling interactions with Src family kinases and other SH3-containing proteins.
Tyrosine phosphorylation sites: Multiple tyrosine residues (Y185, Y198, Y220, Y232, Y247) that become phosphorylated upon Reelin stimulation, creating docking sites for downstream signaling molecules.
C-terminal region: Contains additional regulatory motifs and protein-protein interaction interfaces.
During brain development, DAB1 expression follows a precise temporal pattern:
DAB1 is the central intracellular mediator of Reelin signaling:
Reelin Binding and Receptor Activation
Downstream Signaling
During corticogenesis, Reelin-DAB1 signaling controls:
In the adult brain, DAB1 continues to play crucial roles:
DAB1 influences:
DAB1 has emerged as a significant player in AD pathogenesis:
Evidence for DAB1 involvement in schizophrenia:
DAB1 dysfunction contributes to epileptogenesis:
Reelin → ApoER2/VLDLR → DAB1 → Src Family Kinases
↓
PI3K/AKT ← phosphorylation
↓
Cell survival, migration
↓
GSK3β inhibition
↓
Microtubule stabilization
Therapeutic strategies targeting DAB1:
Potential interventions:
The study of Dab1 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.
Frotscher et al. Reelin and DAB1 in cortical development (2019). 2019. ↩︎
D'Arcangelo et al. Reelin signaling through DAB1 (1999). 1999. ↩︎
Bock & May, DAB1 and neuropsychiatric disease (2016). 2016. ↩︎
Pimentel et al. DAB1 in Alzheimer's disease (2015). 2015. ↩︎
Kobayashi et al. DAB1 phosphorylation sites (2002). 2002. ↩︎
Trommsdorff et al. Reelin receptors and DAB1 (1999). 1999. ↩︎