Aliases for GABBR2 Gene
External Ids for GABBR2 Gene
Previous HGNC Symbols for GABBR2 Gene
Previous GeneCards Identifiers for GABBR2 Gene
The multi-pass membrane protein encoded by this gene belongs to the G-protein coupled receptor 3 family and GABA-B receptor subfamily. The GABA-B receptors inhibit neuronal activity through G protein-coupled second-messenger systems, which regulate the release of neurotransmitters, and the activity of ion channels and adenylyl cyclase. This receptor subunit forms an active heterodimeric complex with GABA-B receptor subunit 1, neither of which is effective on its own. Allelic variants of this gene have been associated with nicotine dependence.[provided by RefSeq, Jan 2010]
GeneCards Summary for GABBR2 Gene
GABBR2 (Gamma-Aminobutyric Acid Type B Receptor Subunit 2) is a Protein Coding gene. Diseases associated with GABBR2 include nicotine dependence, protection against and spinocerebellar ataxia 40. Among its related pathways are Signaling by GPCR and Circadian entrainment. GO annotations related to this gene include G-protein coupled receptor activity and G-protein coupled GABA receptor activity. An important paralog of this gene is GPR156.
UniProtKB/Swiss-Prot for GABBR2 Gene
Component of a heterodimeric G-protein coupled receptor for GABA, formed by GABBR1 and GABBR2. Within the heterodimeric GABA receptor, only GABBR1 seems to bind agonists, while GABBR2 mediates coupling to G proteins. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors, such as adenylate cyclase. Signaling inhibits adenylate cyclase, stimulates phospholipase A2, activates potassium channels, inactivates voltage-dependent calcium-channels and modulates inositol phospholipid hydrolysis. Plays a critical role in the fine-tuning of inhibitory synaptic transmission. Pre-synaptic GABA receptor inhibits neurotransmitter release by down-regulating high-voltage activated calcium channels, whereas postsynaptic GABA receptor decreases neuronal excitability by activating a prominent inwardly rectifying potassium (Kir) conductance that underlies the late inhibitory postsynaptic potentials. Not only implicated in synaptic inhibition but also in hippocampal long-term potentiation, slow wave sleep, muscle relaxation and antinociception.
GABAB receptors are metabotropic G-protein-coupled receptors responsible for mediating the inhibitory effects of GABA alongside ionotropic GABAA and GABAA-rho receptors. They exist as heterodimers of GABAB1 and GABAB2 subunits, with both required for function.