Names & Taxonomy
- Uniprot ID:
- O75899
- Entry Name:
- GABR2_HUMAN
- Status:
- reviewed
- Protein Names:
- Gamma-aminobutyric acid type B receptor subunit 2 (GABA-B receptor 2) (GABA-B-R2) (GABA-BR2) (GABABR2) (Gb2) (G-protein coupled receptor 51) (HG20)
- Gene Names:
- GABBR2 GPR51 GPRC3B
- Gene Names Primary:
- GABBR2
- Organism:
- Homo sapiens (Human)
Structure
- Length:
- 941
- Sequence:
- MASPRSSGQPGPPPPPPPPPARLLLLLLLPLLLPLAPGAWGWARGAPRPPPSSPPLSIMGLMPLTKEVAKGSIGRGVLPAVELAIEQIRNESLLRPYFLDLRLYDTECDNAKGLKAFYDAIKYGPNHLMVFGGVCPSVTSIIAESLQGWNLVQLSFAATTPVLADKKKYPYFFRTVPSDNAVNPAILKLLKHYQWKRVGTLTQDVQRFSEVRNDLTGVLYGEDIEISDTESFSNDPCTSVKKLKGNDVRIILGQFDQNMAAKVFCCAYEENMYGSKYQWIIPGWYEPSWWEQVHTEANSSRCLRKNLLAAMEGYIGVDFEPLSSKQIKTISGKTPQQYEREYNNKRSGVGPSKFHGYAYDGIWVIAKTLQRAMETLHASSRHQRIQDFNYTDHTLGRIILNAMNETNFFGVTGQVVFRNGERMGTIKFTQFQDSREVKVGEYNAVADTLEIINDTIRFQGSEPPKDKTIILEQLRKISLPLYSILSALTILGMIMASAFLFFNIKNRNQKLIKMSSPYMNNLIILGGMLSYASIFLFGLDGSFVSEKTFETLCTVRTWILTVGYTTAFGAMFAKTWRVHAIFKNVKMKKKIIKDQKLLVIVGGMLLIDLCILICWQAVDPLRRTVEKYSMEPDPAGRDISIRPLLEHCENTHMTIWLGIVYAYKGLLMLFGCFLAWETRNVSIPALNDSKYIGMSVYNVGIMCIIGAAVSFLTRDQPNVQFCIVALVIIFCSTITLCLVFVPKLITLRTNPDAATQNRRFQFTQNQKKEDSKTSTSVTSVNQASTSRLEGLQSENHRLRMKITELDKDLEEVTMQLQDTPEKTTYIKQNHYQELNDILNLGNFTESTDGGKAILKNHLDQNPQLQWNTTEPSRTCKDPIEDINSPEHIQRRLSLQLPILHHAYLPSIGGVDASCVSPCVSPTASPRHRHVPPSFRVMVSGL
- Proteomes:
- UP000005640
Subcellular location
- Subcellular Location:
- Cell membrane; Multi-pass membrane protein. Cell junction, synapse, postsynaptic cell membrane; Multi-pass membrane protein. Note=Coexpression of GABBR1 and GABBR2 is required for GABBR1 maturation and transport to the plasma membrane. In contrast, GABBR2 does not depend on GABBR1 for transport to the cell membrane.
Function
- 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. 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.
- Cross Reference Drug Bank:
- DB00181
- Gene Ontology Go:
- cell junction
cytoplasm
G-protein coupled receptor heterodimeric complex
integral component of plasma membrane
neuron projection
plasma membrane
postsynaptic membrane
G-protein coupled GABA receptor activity
G-protein coupled receptor signaling pathway
gamma-aminobutyric acid signaling pathway
negative regulation of adenylate cyclase activity
synaptic transmission - Gene Ontology Biological Process:
- gamma-aminobutyric acid signaling pathway
G-protein coupled receptor signaling pathway
negative regulation of adenylate cyclase activity
synaptic transmission - Gene Ontology Molecular Function:
- G-protein coupled GABA receptor activity
- Gene Ontology Cellular Component:
- cell junction
cytoplasm
G-protein coupled receptor heterodimeric complex
integral component of plasma membrane
neuron projection
plasma membrane
postsynaptic membrane - Keywords:
- 3D-structure
Cell junction
Cell membrane
Coiled coil
Complete proteome
Direct protein sequencing
Disulfide bond
G-protein coupled receptor
Glycoprotein
Membrane
Phosphoprotein
Polymorphism
Postsynaptic cell membrane
Receptor
Reference proteome
Signal
Synapse
Transducer
Transmembrane
Transmembrane helix - Interacts With:
- Q9UBS5; P46459