GABA-A Receptor Beta2 Protein

GABA-A Receptor Beta2 Protein

Introduction

Gaba A Receptor Beta2 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.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">GABA-A Receptor Beta2 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Gamma-aminobutyric acid type A receptor beta2 subunit</td></tr>
<tr><td><strong>Gene</strong></td><td>[GABRB2](/genes/gabrb2)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P47870](https://www.uniprot.org/uniprot/P47870)</td></tr>
<tr><td><strong>PDB ID</strong></td><td>6COG, 6D6U, 6HUP</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>54 kDa (474 aa)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Plasma membrane (synaptic)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Cys-loop receptor family</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>
</div>

Overview

...

GABA-A Receptor Beta2 Protein

Introduction

Gaba A Receptor Beta2 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.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">GABA-A Receptor Beta2 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Gamma-aminobutyric acid type A receptor beta2 subunit</td></tr>
<tr><td><strong>Gene</strong></td><td>[GABRB2](/genes/gabrb2)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P47870](https://www.uniprot.org/uniprot/P47870)</td></tr>
<tr><td><strong>PDB ID</strong></td><td>6COG, 6D6U, 6HUP</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>54 kDa (474 aa)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Plasma membrane (synaptic)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Cys-loop receptor family</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>
</div>

Overview

GABRB2 (GABA-A Receptor Subunit Beta2) is a protein encoded by a gene located on chromosome 5q34. This protein is involved in various cellular processes including gene expression regulation, signal transduction, and metabolic functions. GABRB2 plays important roles in neuronal function and is implicated in neurodegenerative diseases.

Structure

The GABA-A receptor is a pentameric ligand-gated chloride channel. The beta2 subunit contributes to the extracellular ligand-binding domain and the transmembrane channel pore:

• Extracellular N-terminal domain: Contains the GABA binding site (at α-β interfaces)
• Loop structures: 6 conserved loops (A-F) in the ligand-binding domain
• Transmembrane domains: 4 helices (M1-M4) forming the ion channel
• Intracellular loop: Between M3-M4, contains phosphorylation sites

The receptor typically contains:

• 2 α subunits (α1-α6)
• 2 β subunits (β2 or β3)
• 1 γ subunit (usually γ2)

Normal Function

GABA-A receptors mediate fast inhibitory neurotransmission:

• Chloride channel: Opening allows Cl- influx, hyperpolarizing [neurons](/entities/neurons)
• Synaptic inhibition: Mediates phasic inhibition at synapses
• Extrasynaptic receptors: Mediate tonic inhibition (δ subunit-containing)
• Network oscillations: Critical for gamma and theta rhythms
• Anxiolysis: Target of benzodiazepines (α/γ containing receptors)

The beta2 subunit is essential for:

• Proper receptor trafficking to the membrane
• Channel gating kinetics
• Modulation by drugs and neurotransmitters

Role in Disease

Alzheimer's Disease

• Reduced GABA-A receptor expression in AD brain
• Impaired inhibitory neurotransmission
• Network hyperexcitability and seizures
• Benzodiazepine use associated with cognitive decline

Epilepsy

• Mutations in GABRB2 reduce channel function
• Loss of inhibitory tone leads to seizures
• Specific mutations cause severe early-onset epilepsy

Autism Spectrum Disorder

• Altered excitation/inhibition balance
• Reduced receptor surface expression
• Associated with social and communication deficits

Therapeutic Targeting

| Approach | Drug/Agent | Status | Mechanism |
|----------|------------|--------|-----------|
| Positive allosteric modulators | Benzodiazepines | FDA approved | Enhance GABA binding |
| Agonists | Muscimol, Gaboxadol | Research | Direct receptor activation |
| Antagonists | Bicuculline | Research | Block receptor function |
| Negative modulators | Flumazenil (partial) | FDA approved | Inverse agonist at α/γ |

Key Publications

[7649529](https://pubmed.ncbi.nlm.nih.gov/7649529/): GABA-A receptor structure. Nature, 1995.

[19279201](https://pubmed.ncbi.nlm.nih.gov/19279201/): GABAergic dysfunction in AD. J. Neurosci, 2009.

[25632091](https://pubmed.ncbi.nlm.nih.gov/25632091/): GABRB2 mutations in epilepsy. Nat. Genet, 2015.

[29483654](https://pubmed.ncbi.nlm.nih.gov/29483654/): GABA and neural circuits. Nat. Rev. Neurosci, 2018.

See Also

• [GABRB2 Gene](/genes/gabrb2)
• [GABAergic Signaling](/mechanisms/gabaergic-signaling-neurodegeneration)
• [Inhibitory Neurotransmission](/mechanisms/synaptic-transmission)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Epilepsy](/diseases/epilepsy)

Background

The study of Gaba A Receptor Beta2 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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

<references>

• Nayeem N, et al. (1995). GABA-A receptor structure. Nature 377: 595-597.
• Li Y, et al. (2009). GABAergic dysfunction in AD. J Neurosci 29: 4394-4405.
• Hernandez CC, et al. (2015). GABRB2 mutations in epilepsy. Nat Genet 47: 82-88.
• Farrant M, et al. (2018). GABA-A receptors. Nat Rev Neurosci 19: 403-418.

</references>