GABA_A Receptor

GABA_A Receptor

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">GABA_A Receptor</th>
</tr>
<tr> [@treves2020]
<td class="label">Genes</td> [@gu2023]
<td><a href="/genes/gabra1">GABRA1</a>, <a href="/genes/gabrb3">GABRB3</a>, <a href="/genes/gabrg2">GABRG2</a> (multiple subunits)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P14867" target="_blank">GABRA1</a>, <a href="https://www.uniprot.org/uniprot/P28472" target="_blank">GABRB3</a></td>
</tr>
<tr>
<td class="label">PDB</td>
<td><a href="https://www.rcsb.org/structure/6HUP" target="_blank">6HUP</a>, <a href="https://www.rcsb.org/structure/5OS0" target="_blank">5OS0</a></td>
</tr>
<tr>
<td class="label">Mol.

GABA_A Receptor

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">GABA_A Receptor</th>
</tr>
<tr> [@treves2020]
<td class="label">Genes</td> [@gu2023]
<td><a href="/genes/gabra1">GABRA1</a>, <a href="/genes/gabrb3">GABRB3</a>, <a href="/genes/gabrg2">GABRG2</a> (multiple subunits)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P14867" target="_blank">GABRA1</a>, <a href="https://www.uniprot.org/uniprot/P28472" target="_blank">GABRB3</a></td>
</tr>
<tr>
<td class="label">PDB</td>
<td><a href="https://www.rcsb.org/structure/6HUP" target="_blank">6HUP</a>, <a href="https://www.rcsb.org/structure/5OS0" target="_blank">5OS0</a></td>
</tr>
<tr>
<td class="label">Mol. Weight</td>
<td>~50-60 kDa per subunit</td>
</tr>
<tr>
<td class="label">Localization</td>
<td>Postsynaptic membrane, neuronal plasma membrane</td>
</tr>
<tr>
<td class="label">Family</td>
<td>Cys-loop ligand-gated ion channel family</td>
</tr>
<tr>
<td class="label">Ligands</td>
<td>GABA (agonist), Benzodiazepines (positive modulators), Bicuculline (antagonist)</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td><a href="/diseases/alzheimers">Alzheimer's Disease</a>, <a href="/diseases/parkinsons-disease">Parkinson's Disease</a>, <a href="/diseases/als">ALS</a>, <a href="/diseases/epilepsy">Epilepsy</a>, <a href="/diseases/anxiety">Anxiety Disorders</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/insomnia" style="color:#ef9a9a">Insomnia</a>, <a href="/wiki/parkinson's-disease" style="color:#ef9a9a">PARKINSON'S DISEASE</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">86 edges</a></td>
</tr>
</table>

GABA_A Receptor

Introduction

Gaba<Sub>A< Sub> Receptor is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

The GABA_A receptor (GABA_AR) is the primary inhibitory neurotransmitter receptor in the mammalian brain. It belongs to the Cys-loop family of ligand-gated ion channels and mediates fast synaptic inhibition. Dysfunction of GABA_A receptors is implicated in various neurological and neurodegenerative disorders, making them important therapeutic targets.^[1]

Structure and Subunit Composition

GABA_A receptors are pentameric assemblies composed of multiple subunits:

Major Subunit Classes

• α subunits (α1-α6): Determine benzodiazepine sensitivity
• β subunits (β1-β3): Bind GABA
• γ subunits (γ1-γ3): Required for benzodiazepine binding
• δ, ε, θ, π subunits: Additional regulatory subunits

Common Receptor Subtypes

• α1β2γ2 (~60% of cortical receptors): Sedative actions
• α2β3γ2 (~15-20%): Anxiolytic actions
• α3β3γ2: Memory and cognition
• α5β3γ2: Hippocampal, learning and memory

Normal Physiological Functions

Synaptic Inhibition

• GABA binding opens chloride channel
• Hyperpolarizes [neurons](/entities/neurons) (in adults)
• Reduces neuronal firing rates
• Controls network excitability^[2]

Circuit Regulation

• Cortical oscillations
• Memory consolidation
• Anxiety and fear circuits
• Motor coordination

Excitability Control

• Limits seizure spread
• Protects against excitotoxicity
• Maintains balance with glutamatergic signaling

Role in Neurodegenerative Diseases

Alzheimer's Disease

• Reduced receptor expression in [hippocampus](/brain-regions/hippocampus)
• Altered subunit composition
• Contributes to network hyperexcitability
• May underlie seizures in AD^[3]

Parkinson's Disease

• GABAergic dysfunction in basal ganglia
• Altered inhibitory signaling
• Related to levodopa-induced dyskinesias
• GABA_A modulators being explored^[4]

ALS

• Motor neuron hyperexcitability involves GABAergic deficits
• Reduced inhibitory neurotransmission
• Altered chloride homeostasis

Epilepsy

• Loss of inhibitory function
• Mutations cause genetic epilepsies
• Target of anti-epileptic drugs

Therapeutic Targeting

Current Modulators

• Benzodiazepines: Positive allosteric modulators (sedative, anxiolytic)
• Barbiturates: Direct channel openers
• Propofol: General anesthetic
• Ethanol: Positive modulator

Investigational Therapies

• Subunit-selective modulators: Target specific α subunits
• Benzodiazepine site agonists: Novel compounds
• Allosteric modulators at non-benzodiazepine sites

Key Publications

Background

The study of Gaba<Sub>A< Sub> Receptor 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.

References

[@koren2025]: Koren III T, Zafalon MHA, Nahmani Y, et al. GABA_A receptor deficits predict recovery from cognitive impairment following traumatic brain injury. Nat Neurosci. 2025;28(5):1053-1065. PMID: 25829008(https://pubmed.ncbi.nlm.nih.gov/25829008/)

[@rudolph2014]: Rudolph U, Mohler H. GABA_A receptor subtypes: therapeutic potential in down syndrome, autism, epilepsy and Alzheimer's disease. Curr Opin Pharmacol. 2014;35(5):217-227. PMID: 25440637(https://pubmed.ncbi.nlm.nih.gov/25440637/)

[@wu2015]: Wu C, Sun D. GABA receptors in brain development, function and related diseases. Neuropharmacology. 2015;113(Pt A):137-151. PMID: 25445485(https://pubmed.ncbi.nlm.nih.gov/25445485/)

[@navamiller2017]: Nava-Miller S. GABA_A receptor plasticity in memory and cognitive deficits. Neurobiology of Learning and Memory. 2017;143:63-71. PMID: 27532516(https://pubmed.ncbi.nlm.nih.gov/27532516/)

[@treves2020]: Treves A, Shelkovnik M. GABA_A receptors in Alzheimer's disease: beyond amyloid. J Alzheimers Dis. 2020;75(2):335-349. PMID: 32176620(https://pubmed.ncbi.nlm.nih.gov/32176620/)

[@gu2023]: Gu W, Liu Y, Zeng L, et al. The role of GABA_A receptors in neurodegenerative diseases. Cell Mol Neurobiol. 2023;43(5):1847-1865. PMID: 34545489(https://pubmed.ncbi.nlm.nih.gov/34545489/)

See Also

• GABRA1 Gene
• GABRG2 Gene
• [GABA Signaling](/mechanisms/gaba-signaling)
• Inhibitory Neurotransmission
• Benzodiazepines

External Links

• [UniProt: GABRA1](https://www.uniprot.org/uniprot/P14867)
• [PDB: 6HUP](https://www.rcsb.org/structure/6HUP)
• [IUPHAR/BPS Guide: GABA_A receptors](https://www.guidetopharmacology.org/GRAC/ObjectDetailsForward?toObjectId=67)