UniProt Protein Function: | 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. Calcium is required for high affinity binding to GABA. 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. Activated by (-)-baclofen, cgp27492 and blocked by phaclofen. |
NCBI Summary: | This gene encodes a receptor for gamma-aminobutyric acid (GABA), which is the main inhibitory neurotransmitter in the mammalian central nervous system. This receptor functions as a heterodimer with GABA(B) receptor 2. Defects in this gene may underlie brain disorders such as schizophrenia and epilepsy. Alternative splicing generates multiple transcript variants, but the full-length nature of some of these variants has not been determined. [provided by RefSeq, Jan 2016] |
UniProt Code: | Q9UBS5 |
NCBI GenInfo Identifier: | 12643873 |
NCBI Gene ID: | 2550 |
NCBI Accession: | Q9UBS5.1 |
UniProt Secondary Accession: | Q9UBS5,O95375, O95468, O95975, O96022, Q5STL4, Q5SUJ8 Q5SUL3, Q71SG6, Q86W60, Q9UQQ0, B0UXY7, |
UniProt Related Accession: | Q9UBS5 |
Molecular Weight: | 65,082 Da |
NCBI Full Name: | Gamma-aminobutyric acid type B receptor subunit 1 |
NCBI Synonym Full Names: | gamma-aminobutyric acid type B receptor subunit 1 |
NCBI Official Symbol: | GABBR1 |
NCBI Official Synonym Symbols: | GB1; GPRC3A; GABABR1; GABBR1-3 |
NCBI Protein Information: | gamma-aminobutyric acid type B receptor subunit 1 |
UniProt Protein Name: | Gamma-aminobutyric acid type B receptor subunit 1 |
Protein Family: | Gamma-aminobutyric acid type B receptor |
UniProt Gene Name: | GABBR1 |
UniProt Entry Name: | GABR1_HUMAN |