GABRA2 Protein
Introduction <table class="infobox infobox-protein">Protein Name </td>Gene </td>UniProt ID </td>PDB ID </td>Molecular Weight </td>Subcellular Localization </td>Protein Family </td>
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GABRA2 Protein
Introduction <table class="infobox infobox-protein">Protein Name </td>Gene </td>UniProt ID </td>PDB ID </td>Molecular Weight </td>Subcellular Localization </td>Protein Family </td>
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.
Overview
Structure 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 sitesTransmembrane domains : Four helices (M1-M4) forming the chloride channelIntracellular loop : Contains trafficking signals and phosphorylation sitesAlpha2-containing receptors typically have the composition α2β2/3γ2.
Normal Function
Receptor Composition
Second most abundant GABA-A receptor subunit
Highly expressed in limbic system structures
Distinct pharmacological profile (relatively benzodiazepine-insensitive)
Physiological Roles
Mediates inhibitory neurotransmission in amygdala and [hippocampus](/brain-regions/hippocampus)
Critical for anxiety regulation and emotional processing
Involved in alcohol sensitivity and reward pathways
Contributes to muscle relaxation
Role in Disease
Alcohol Use Disorder
Genetic variants : GABRA2 SNPs correlate with alcohol dependence riskMechanism : Altered receptor function affects reward pathway signalingTherapeutic target : Compounds modulating α2-containing receptorsAnxiety Disorders
GABRA2 variants : Associated with anxiety phenotypesReduced function : May contribute to heightened anxiety statesNeurodegenerative Diseases
Alzheimer's Disease : Limbic system GABAergic dysfunctionParkinson's Disease : Altered basal ganglia inhibitory circuitsTherapeutic Targeting
Current Approaches
Drug Development
α2/α3-selective anxiolytics (avoid sedation)
Compounds targeting alcohol craving
Allosteric modulators with improved safety profiles
Key Publications
Edenberg HJ, et al. (2004). GABRA2 and alcohol dependence . Am J Hum Genet. PMID: 15549779 (https://pubmed.ncbi.nlm.nih.gov/15549779/)
Möhler H. (2006). GABA(A) receptors in disease . NeuroRx. PMID: 16674156 (https://pubmed.ncbi.nlm.nih.gov/16674156/)
See Also
[GABA-A Receptor](/proteins/gaba-a-receptor)
[GABA Signaling in Neurodegeneration](/mechanisms/gaba-imbalance)
[GABRA1 Gene](/proteins/gabra1-protein)
[GABRA2 Gene](/proteins/gabra2-protein)
[GABRA3 Gene](/proteins/gabra3-protein)
[Epilepsy](/diseases/epilepsy)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Anxiety Disorders](/diseases/anxiety-disorders)
External Links
[NCBI Gene: GABRA2](https://www.ncbi.nlm.nih.gov/gene/2566)
[UniProt: GABRA2](https://www.uniprot.org/uniprot/P47870)
[OMIM: GABRA2](https://www.omim.org/entry/137142)
Background 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.
Molecular Mechanisms 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 subunitsChloride channel : Opens upon GABA binding to allow Cl- influxLocalization : High expression in hippocampus, amygdala, and cortexSynaptic localization : Primarily synaptic GABA-A receptorsGABA-A α2 receptors mediate:
Inhibitory neurotransmission : Reduces neuronal excitabilityAnxiolysis : Anxiolytic effects of benzodiazepinesMuscle relaxation : Mediates muscle relaxant effectsRole in Neurodegeneration
Alzheimer's disease : GABAergic dysfunction contributes to hyperexcitabilityParkinson's disease : Altered GABA signaling in basal gangliaEpilepsy : GABA-A receptor dysfunction in seizure disordersTherapeutic : Benzodiazepine target; subunit-selective modulators in developmentReferences
Edenberg HJ, et al, (2004) (2004)
Unknown, Möhler H. (2006) (2006)
Rudolph U, et al, (2001) (2001)
Sieghart W, (2006) (2006)
Porjesz B, et al, (2002) (2002)
Fehr C, et al, (2006) (2006)
Bmaie J, et al, (2008) (2008)
Whiting PJ, (2003) (2003) Show full description