Protein Name: Shank1 (SH3 and multiple ankyrin repeat domains protein 1)
Gene Symbol: SHANK1
UniProt ID: Q9Y2X2
Molecular Weight: 225 kDa
PDB IDs: 1UGN, 2ES4, 2RCN
Subcellular Localization: Postsynaptic density of excitatory synapses, dendritic spines
Shank1 is a large scaffold protein with multiple domains:
- Ankyrin Repeats (ANK): Residues 1-500; mediate protein-protein interactions
- SH3 Domain: Residues 501-600; binds proline-rich motifs
- Proline-Rich Region: Residues 600-1400; multiple binding sites
- SAD/PEST Region: Residues 1400-1600; degradation signals
- PDZ Domain: Residues 1600-2100; binds C-terminal motifs
Shank proteins form multimers via their ANK domains, creating a mesh-like scaffold at postsynaptic densities.
Shank1 is a core component of the postsynaptic density (PSD):
- Scaffold Assembly: Shank1 connects membrane proteins to the actin cytoskeleton
- Receptor Clustering: Anchors glutamate receptors (AMPAR, NMDAR) at synapses
- Signal Transduction: Links synaptic activity to intracellular signaling cascades
- Synapse Stability: Maintains dendritic spine morphology
- Glutamate Receptors: GluA1, GluN2A, GluN2B
- Cytoskeleton: Actin (via cortactin), α-actinin
- Signaling Proteins: CaMKII, PSD-95, Homer
- Membrane Proteins: GRIP, Pick1
- Shank1 levels increase during LTP (PMID: 10751669)
- Regulates spine enlargement and structural plasticity
- Activity-dependent redistribution at synapses
- Shank1 dysregulation in dopaminergic neuron dendrites
- Contributes to synaptic dysfunction in PD models
- SHANK1 mutations associated with ASD (PMID: 19542379)
- Haploinsufficiency affects social behavior
- Reduced Shank1 expression in prefrontal cortex (PMID: 18614665)
- Contributes to synaptic pathology in schizophrenia
- Scaffold Stabilizers: Small molecules maintaining Shank1-PSD interactions
- Actin Cytoskeleton Modulators: Enhancing spine stability
- Gene Therapy: Restoring Shank1 expression in neurodegenerative states