Gabra2 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.
| Property |
Value |
| Protein Name |
GABA-A Receptor Alpha2 Subunit |
| Gene |
GABRA2 |
| UniProt ID |
P47869 |
| PDB ID |
5EW7, 6HUP |
| Molecular Weight |
51 kDa |
| Subcellular Localization |
Plasma membrane (synaptic and extrasynaptic) |
| Protein Family |
Cys-loop ligand-gated ion channel receptor family |
The GABA-A receptor alpha2 subunit shares the general architecture of Cys-loop ligand-gated ion channels:
- Extracellular N-terminal domain: Contains the Cys-loop motif and ligand binding sites
- Transmembrane domains: Four helices (M1-M4) forming the chloride channel
- Intracellular loop: Contains trafficking signals and phosphorylation sites
Alpha2-containing receptors typically have the composition α2β2/3γ2.
- Second most abundant GABA-A receptor subunit
- Highly expressed in limbic system structures
- Distinct pharmacological profile (relatively benzodiazepine-insensitive)
- Mediates inhibitory neurotransmission in amygdala and hippocampus
- Critical for anxiety regulation and emotional processing
- Involved in alcohol sensitivity and reward pathways
- Contributes to muscle relaxation
- Genetic variants: GABRA2 SNPs correlate with alcohol dependence risk
- Mechanism: Altered receptor function affects reward pathway signaling
- Therapeutic target: Compounds modulating α2-containing receptors
- GABRA2 variants: Associated with anxiety phenotypes
- Reduced function: May contribute to heightened anxiety states
- Alzheimer's Disease: Limbic system GABAergic dysfunction
- Parkinson's Disease: Altered basal ganglia inhibitory circuits
| Drug |
Type |
Clinical Use |
| Baclofen |
GABA-B agonist |
Alcohol use disorder (off-label) |
| LSA |
GABA-A positive allosteric modulator |
Research |
- α2/α3-selective anxiolytics (avoid sedation)
- Compounds targeting alcohol craving
- Allosteric modulators with improved safety profiles
- Edenberg HJ, et al. (2004). GABRA2 and alcohol dependence. Am J Hum Genet. PMID:15549779
- Möhler H. (2006). GABA(A) receptors in disease. NeuroRx. PMID:16674156
The study of Gabra2 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.
- Edenberg HJ, et al. (2004). Variations in GABRA2, encoding the alpha2 subunit of the GABA(A) receptor, are associated with alcohol dependence. Am J Hum Genet. 74(4):705-714.
- Möhler H. (2006). GABA(A) receptors in central nervous system disease. NeuroRx. 3(2):154-164.
- Rudolph U, et al. (2001). GABA(A) receptor subtypes. Curr Pharm Des. 7(14):1399-1414.
- Sieghart W. (2006). Structure, pharmacology and function of GABA(A) receptor subtypes. Pharmacol Rev. 58(4):627-672.
- Porjesz B, et al. (2002). Linkage disequilibrium between the beta frequency of the human EEG and a GABRA2 gene polymorphism. Clin Neurophysiol. 113(9):1374-1380.
- Fehr C, et al. (2006). GABRA2 and alcohol dependence. Mol Psychiatry. 11(5):443-451.
- Bmaie J, et al. (2008). GABA(A) receptor alpha2 subunit. Neuropsychopharmacology. 33(6):1370-1381.
- Whiting PJ. (2003). GABA-A receptor subtypes. Curr Opin Pharmacol. 3(1):101-106.
GABRA2 (GABA-A Receptor Alpha 2 Subunit) is a ligand-gated chloride channel subunit:
- Receptor composition: Forms GABA-A receptors with α2, β, and γ subunits
- Chloride channel: Opens upon GABA binding to allow Cl- influx
- Localization: High expression in hippocampus, amygdala, and cortex
- Synaptic localization: Primarily synaptic GABA-A receptors
GABA-A α2 receptors mediate:
- Inhibitory neurotransmission: Reduces neuronal excitability
- Anxiolysis: Anxiolytic effects of benzodiazepines
- Muscle relaxation: Mediates muscle relaxant effects
- Alzheimer's disease: GABAergic dysfunction contributes to hyperexcitability
- Parkinson's disease: Altered GABA signaling in basal ganglia
- Epilepsy: GABA-A receptor dysfunction in seizure disorders
- Therapeutic: Benzodiazepine target; subunit-selective modulators in development