Transmembrane AMPA receptor regulatory protein gamma-4–Glutamate ionotropic receptor AMPA type subunit 1 complex (TARPγ4–GluA1 complex)

The TARPγ4–GluA1 receptor complex is a functional unit in the central nervous system consisting of the pore-forming Glutamate ionotropic receptor AMPA type subunit 1 (GluA1) and its auxiliary subunit, Transmembrane AMPA receptor regulatory protein gamma-4 (TARPγ4). TARPγ4, encoded by the CACNG4 gene, belongs to the Type I TARP family and plays a critical role in the trafficking, synaptic localization, and gating kinetics of AMPA receptors (UniProt P60351, P42261). By modulating the deactivation and desensitization rates of the GluA1 subunit, this complex significantly influences excitatory synaptic transmission and plasticity (Milstein & Nicoll, 2008, PubMed: 18441301). Dysregulation of this complex is implicated in various neurological and psychiatric conditions, including epilepsy, schizophrenia, and chronic pain (Jackson & Nicoll, 2011, PubMed: 21414430). From a pharmacological perspective, the complex is a high-interest target because auxiliary subunits like TARPγ4 offer a mechanism for subunit-selective or region-specific modulation of AMPA receptors, potentially overcoming the narrow therapeutic window associated with non-selective antagonists. Current research focuses on identifying small molecules that bind to the interface of the TARP and the receptor to achieve fine-tuned control of glutamatergic neurotransmission (Kato et al., 2016, PubMed: 27103561). Such selectivity is intended to minimize systemic side effects, such as ataxia and sedation, typically seen with broad-spectrum AMPA receptor antagonists like perampanel.

Other names

CACNG4-GRIA1 complexTARP gamma-4-GluA1 complexStargazin-like protein gamma-4-AMPA receptor complexVoltage-dependent calcium channel gamma-4 subunit-AMPA receptor complex

Negative allosteric modulation of the AMPA receptor ion channel