Human Gene GABBR1 (uc011goy.2) Description and Page Index
  Description: Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1 (GABBR1), transcript variant 1, mRNA.
RefSeq Summary (NM_021903): Gamma-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the mammalian central nervous system. GABA exerts its effects through ionotropic [GABA(A/C)] receptors, to produce fast synaptic inhibition, and metabotropic [GABA(B)] receptors, to produce slow, prolonged inhibitory signals. The GABA(B) receptor consists of a heterodimer of two related 7-transmembrane receptors, GABA(B) receptor 1 and GABA(B) receptor 2. The GABA(B) receptor 1 gene is mapped to chromosome 6p21.3 within the HLA class I region close to the HLA-F gene. Susceptibility loci for multiple sclerosis, epilepsy, and schizophrenia have also been mapped in this region. Alternative splicing of this gene generates multiple transcript variants. [provided by RefSeq, Jun 2009].
Transcript (Including UTRs)
   Position: chr6_mann_hap4:873,029-903,954 Size: 30,926 Total Exon Count: 23 Strand: -
Coding Region
   Position: chr6_mann_hap4:874,344-898,375 Size: 24,032 Coding Exon Count: 18 

Page IndexSequence and LinksUniProtKB CommentsGenetic AssociationsCTDMicroarray
RNA StructureProtein StructureOther SpeciesmRNA DescriptionsPathwaysOther Names
Model InformationMethods
Data last updated: 2013-06-14

+  Sequence and Links to Tools and Databases
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-  Comments and Description Text from UniProtKB
DESCRIPTION: RecName: Full=Gamma-aminobutyric acid type B receptor subunit 1; Short=GABA-B receptor 1; Short=GABA-B-R1; Short=GABA-BR1; Short=GABABR1; Short=Gb1; Flags: Precursor;
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.
FUNCTION: Isoform 1E may regulate the formation of functional GABBR1/GABBR2 heterodimers by competing for GABBR2 binding. This could explain the observation that certain small molecule ligands exhibit differential affinity for central versus peripheral sites.
SUBUNIT: Heterodimer of GABBR1 and GABBR2. Homodimers may form, but are inactive. Isoform 1E (without C-terminal intracellular domain) is unable to dimerize via a coiled-coil interaction with GABBR2. Interacts with the leucine zipper of the C-terminal bZIP domain of ATF4 via its C-terminal region. Interacts with JAKMIP1.
INTERACTION: P61244:MAX; NbExp=3; IntAct=EBI-724156, EBI-751711; P16333:NCK1; NbExp=3; IntAct=EBI-724156, EBI-389883; P46459:NSF; NbExp=3; IntAct=EBI-724156, EBI-712251;
SUBCELLULAR LOCATION: Cell membrane; Multi-pass membrane protein. Cell junction, synapse, postsynaptic cell membrane; Multi-pass membrane protein. Cell projection, dendrite (By similarity). Note=Colocalizes with ATF4 in hippocampal neuron dendritic membranes (By similarity). Coexpression of GABBR1 and GABBR2 is required for GABBR1 maturation and transport to the plasma membrane.
SUBCELLULAR LOCATION: Isoform 1E: Secreted (Probable).
TISSUE SPECIFICITY: Highly expressed in brain and weakly in heart, small intestine and uterus. Isoform 1A is mostly expressed in granular cell and molecular layer. Isoform 1B is mostly expressed in Purkinje cells. Isoform 1E is predominantly expressed in peripheral tissues as kidney, lung, trachea, colon, small intestine, stomach, bone marrow, thymus and mammary gland.
DOMAIN: Alpha-helical parts of the C-terminal intracellular region mediate heterodimeric interaction with GABA-B receptor 2. The linker region between the transmembrane domain 3 (TM3) and the transmembrane domain 4 (TM4) probably play a role in the specificity for G-protein coupling.
SIMILARITY: Belongs to the G-protein coupled receptor 3 family. GABA-B receptor subfamily.
SIMILARITY: Contains 2 Sushi (CCP/SCR) domains.

-  Genetic Association Studies of Complex Diseases and Disorders
  Genetic Association Database: GABBR1
CDC HuGE Published Literature: GABBR1
Positive Disease Associations: schizophrenia , sleep apnea
Related Studies:
  1. schizophrenia
    Zai, G. et al. 2005, Possible association between the gamma-aminobutyric acid type B receptor 1 (GABBR1) gene and schizophrenia., European neuropsychopharmacology. 2005 May;15(3):347-52. [PubMed 15820424]
    Further investigations of the role of GABBR1 in SCZ are warranted.
  2. schizophrenia
    Zhao, X. et al. 2007, Systematic study of association of four GABAergic genes, Schizophr Res 2007. [PubMed 17412563]
  3. sleep apnea
    Bayazit, Y. A. et al. 2007, Association of GABA(B)R1 Receptor Gene Polymorphism with Obstructive Sleep Apnea Syndrome, ORL J Otorhinolaryngol Relat Spec 2007 69(3) 190-197. [PubMed 17264536]
    The Ala20Val polymorphism of the GABA(B)R1 gene may be associated with OSAS, whereas Gly489Ser polymorphism does not seem to be involved in OSAS.
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-  Comparative Toxicogenomics Database (CTD)
  The following chemicals interact with this gene           more ... click here to view the complete list

-  Microarray Expression Data
Expression ratio colors:

GNF Expression Atlas 2 Data from U133A and GNF1H Chips


GNF Expression Atlas 1 Human Data on Affy U95 Chips


-  mRNA Secondary Structure of 3' and 5' UTRs
RegionFold EnergyBasesEnergy/Base
Display As
5' UTR -414.81803-0.517 Picture PostScript Text
3' UTR -433.891315-0.330 Picture PostScript Text

The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.

-  Protein Domain and Structure Information
  InterPro Domains: Graphical view of domain structure
IPR001828 - ANF_lig-bd_rcpt
IPR017978 - GPCR_3_C
IPR002455 - GPCR_3_GABA_rcpt_B
IPR002456 - GPCR_3_GABA_rcpt_B1
IPR028082 - Peripla_BP_I
IPR000436 - Sushi_SCR_CCP

Pfam Domains:
PF00003 - 7 transmembrane receptor (metabotropic glutamate family)
PF01094 - Receptor family ligand binding region

SCOP Domains:
53822 - Periplasmic binding protein-like I

ModBase Predicted Comparative 3D Structure on Q9UBS5
The pictures above may be empty if there is no ModBase structure for the protein. The ModBase structure frequently covers just a fragment of the protein. You may be asked to log onto ModBase the first time you click on the pictures. It is simplest after logging in to just click on the picture again to get to the specific info on that model.

-  Orthologous Genes in Other Species
  Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
MouseRatZebrafishD. melanogasterC. elegansS. cerevisiae
Genome BrowserGenome BrowserNo orthologNo orthologNo orthologNo ortholog
Gene DetailsGene Details    
Gene SorterGene Sorter    
Jackson LabRGD    
Protein Sequence     

-  Descriptions from all associated GenBank mRNAs
  BC051463 - Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1, mRNA (cDNA clone IMAGE:5299098), **** WARNING: chimeric clone ****.
AJ225028 - Homo sapiens mRNA for GABA-B R1a receptor.
Y11044 - Homo sapiens mRNA for GABA-BR1a (hGB1a) receptor.
BC050532 - Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1, mRNA (cDNA clone MGC:57575 IMAGE:5732186), complete cds.
AJ012288 - Homo sapiens mRNA for GABA-BR1.
BC023336 - Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1, mRNA (cDNA clone IMAGE:4934044).
BC042598 - Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1, mRNA (cDNA clone MGC:24911 IMAGE:4938491), complete cds.
BC041332 - Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1, mRNA (cDNA clone MGC:41792 IMAGE:5275467), complete cds.
AB208790 - Homo sapiens mRNA for gamma-aminobutyric acid (GABA) B receptor 1 isoform c precursor variant protein.
AK290191 - Homo sapiens cDNA FLJ77697 complete cds, highly similar to Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1 (GABBR1), transcript variant 2, mRNA.
AJ225029 - Homo sapiens mRNA for GABA-B R1b receptor.
AF099148 - Homo sapiens GABA-B1a receptor mRNA, complete cds.
AK223619 - Homo sapiens mRNA for gamma-aminobutyric acid (GABA) B receptor 1 isoform b precursor variant, clone: FCC134B02.
AJ012186 - Homo sapiens mRNA for GABAB receptor, subunit 1b.
AK312308 - Homo sapiens cDNA, FLJ92613, Homo sapiens gamma-aminobutyric acid (GABA) B receptor, 1 (GABBR1),transcript variant 2, mRNA.
AJ012185 - Homo sapiens mRNA for GABAB-receptor, subunit 1a.
AJ012187 - Homo sapiens mRNA for GABAB receptor, subunit 1c.
AB527851 - Synthetic construct DNA, clone: pF1KB8525, Homo sapiens GABBR1 gene for gamma-aminobutyric acid (GABA) B receptor, 1, without stop codon, in Flexi system.
AF301005 - Homo sapiens gamma-aminobutyric acid receptor GABA-B1e mRNA, complete cds.

-  Biochemical and Signaling Pathways
  KEGG - Kyoto Encyclopedia of Genes and Genomes
hsa04080 - Neuroactive ligand-receptor interaction

-  Other Names for This Gene
  Alternate Gene Symbols: AB208790, B0UXY7, GABR1_HUMAN, GPRC3A, NM_021903, NP_068703, O95375, O95468, O95975, O96022, Q5STL4, Q5SUJ8, Q5SUL3, Q86W60, Q9UBS5, Q9UQQ0
UCSC ID: uc011goy.2
RefSeq Accession: NM_021903
Protein: Q9UBS5 (aka GABR1_HUMAN