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UniProtKB/Swiss-Prot entry P18507


[Entry info] [Name and origin] [References] [Comments] [Cross-references] [Keywords] [Features] [Sequence] [Tools]

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Entry information
Entry name GBRG2_HUMAN
Primary accession number P18507
Secondary accession numbers Q6GRL6 Q9UN15
Integrated into Swiss-Prot on November 1, 1990
Sequence was last modified on October 17, 2006 (Sequence version 2)
Annotations were last modified on    July 22, 2008 (Entry version 96)
Name and origin of the protein
Protein name Gamma-aminobutyric acid receptor subunit gamma-2 [Precursor]
Synonym GABA(A) receptor subunit gamma-2
Gene name
Name: GABRG2
From
Homo sapiens (Human) [TaxID: 9606] 
Taxonomy Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.
Protein existence 1: Evidence at protein level;
References
[1]
NUCLEOTIDE SEQUENCE [MRNA].
TISSUE=Brain;
DOI=10.1038/338582a0; PubMed=2538761 [NCBI, ExPASy, EBI, Israel, Japan]
Pritchett D.B., Sontheimer H., Shivers B.D., Ymer S., Kettenmann H., Schofield P.R., Seeburg P.H.;
"Importance of a novel GABAA receptor subunit for benzodiazepine pharmacology.";
Nature 338:582-585(1989).
[2]
NUCLEOTIDE SEQUENCE [GENOMIC DNA].
PubMed=11328646 [NCBI, ExPASy, EBI, Israel, Japan]
Jiang S., Yu J., Wang J., Tan Z., Xue H., Feng G., He L., Yang H.;
"Complete genomic sequence of 195 Kb of human DNA containing the gene GABRG2.";
DNA Seq. 11:373-382(2000).
[3]
NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
DOI=10.1101/gr.2596504; PubMed=15489334 [NCBI, ExPASy, EBI, Israel, Japan]
The MGC Project Team;
"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).";
Genome Res. 14:2121-2127(2004).
[4]
INTERACTION WITH GABARAP.
DOI=10.1038/16264; PubMed=9892355 [NCBI, ExPASy, EBI, Israel, Japan]
Wang H., Bedford F.K., Brandon N.J., Moss S.J., Olsen R.W.;
"GABA(A)-receptor-associated protein links GABA(A) receptors and the cytoskeleton.";
Nature 397:69-72(1999).
[5]
VARIANT GEFS+3 MET-328.
DOI=10.1038/88254; PubMed=11326274 [NCBI, ExPASy, EBI, Israel, Japan]
Baulac S., Huberfeld G., Gourfinkel-An I., Mitropoulou G., Beranger A., Prud'homme J.-F., Baulac M., Brice A., Bruzzone R., LeGuern E.;
"First genetic evidence of GABA(A) receptor dysfunction in epilepsy: a mutation in the gamma2-subunit gene.";
Nat. Genet. 28:46-48(2001).
[6]
VARIANT ECA2/FEB8 GLN-82.
DOI=10.1038/88259; PubMed=11326275 [NCBI, ExPASy, EBI, Israel, Japan]
Wallace R.H., Marini C., Petrou S., Harkin L.A., Bowser D.N., Panchal R.G., Williams D.A., Sutherland G.R., Mulley J.C., Scheffer I.E., Berkovic S.F.;
"Mutant GABA(A) receptor gamma2-subunit in childhood absence epilepsy and febrile seizures.";
Nat. Genet. 28:49-52(2001).
[7]
VARIANT FEB8 GLY-177.
DOI=10.1212/01.wnl.0000230145.73496.a2; PubMed=16924025 [NCBI, ExPASy, EBI, Israel, Japan]
Audenaert D., Schwartz E., Claeys K.G., Claes L., Deprez L., Suls A., Van Dyck T., Lagae L., Van Broeckhoven C., Macdonald R.L., De Jonghe P.;
"A novel GABRG2 mutation associated with febrile seizures.";
Neurology 67:687-690(2006).
Comments
  • FUNCTION: GABA, the major inhibitory neurotransmitter in the vertebrate brain, mediates neuronal inhibition by binding to the GABA/benzodiazepine receptor and opening an integral chloride channel.
  • SUBUNIT: Generally pentameric. There are five types of GABA(A) receptor chains: alpha, beta, gamma, delta, and rho. Interacts with GABARAP.
  • SUBCELLULAR LOCATION: Cell junction, synapse, postsynaptic cell membrane; Multi-pass membrane protein. Cell membrane; Multi-pass membrane protein.
  • PTM: Palmitoylated by ZDHHC3/GODZ; which may affect presynaptic clustering and/or cell surface stability (By similarity).
  • DISEASE: Defects in GABRG2 are the cause of childhood absence epilepsy type 2 (ECA2) [MIM:607681]. ECA2 is a subtype of idiopathic generalized epilepsy (IGE) characterized by an onset at age 6-7 years, frequent absence seizures (several per day) and bilateral, synchronous, symmetric 3-Hz spike waves on EEG. During adolescence, tonic-clonic and myoclonic seizures develop. Some individuals manifest ECA2 occurring in combination with febrile convulsions [MIM:611277].
  • DISEASE: Defects in GABRG2 are the cause of familial febrile convulsions type 8 (FEB8) [MIM:611277]. A febrile convulsion is defined as a seizure event in infancy or childhood, usually occurring between 6 months and 6 years of age, associated with fever but without any evidence of intracranial infection or defined pathologic or traumatic cause. Febrile convulsions affect 5-12% of infants and children up to 6 years of age. There is epidemiological evidence that febrile seizures are associated with subsequent afebrile and unprovoked seizures in 2% to 7% of patients.
  • DISEASE: Defects in GABRG2 are the cause of generalized epilepsy with febrile seizures plus type 3 (GEFS+3) [MIM:604233]. Generalized epilepsy with febrile seizures-plus refers to a rare autosomal dominant, familial condition with incomplete penetrance and large intrafamilial variability. Patients display febrile seizures persisting sometimes beyond the age of 6 years and/or a variety of afebrile seizure types. GEFS+ is a disease combining febrile seizures, generalized seizures often precipitated by fever at age 6 years or more, and partial seizures, with a variable degree of severity.
  • DISEASE: Defects in GABRG2 are a cause of severe myoclonic epilepsy in infancy (SMEI) [MIM:607208]; also called Dravet syndrome. SMEI is a rare disorder characterized by generalized tonic, clonic, and tonic-clonic seizures that are initially induced by fever and begin during the first year of life. Later, patients also manifest other seizure types, including absence, myoclonic, and simple and complex partial seizures. Psychomotor development delay is observed around the second year of life. SMEI is considered to be the most severe phenotype within the spectrum of generalized epilepsies with febrile seizures-plus.
  • MISCELLANEOUS: This subunit carries the benzodiazepine binding site.
  • SIMILARITY: Belongs to the ligand-gated ionic channel (TC 1.A.9) family [view classification].
  • WEB RESOURCE: Name=Protein Spotlight; Note=Forbidden fruit - Issue 56 of March 2005; URL="http://www.expasy.org/spotlight/back_issues/sptlt056.shtml";.
Copyright
Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.
Cross-references
Sequence databases
EMBL
X15376; CAA33437.1; -; mRNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
AF165124; AAD50273.1; -; Genomic_DNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
BC069348; AAH69348.1; -; mRNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
BC074795; AAH74795.1; -; mRNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
PIR S03905; S03905.
RefSeq NP_000807.2; -.
UniGene Hs.7195
3D structure databases
ModBase P18507.
PTM databases
PhosphoSite P18507; -.
Organism-specific databases
H-InvDB HIX0024813; -.
HGNC HGNC:4087; GABRG2.
GenAtlas GABRG2.
MIM 137164; gene. [NCBI / EBI]
604233; phenotype. [NCBI / EBI]
607208; phenotype. [NCBI / EBI]
607681; phenotype. [NCBI / EBI]
611277; phenotype. [NCBI / EBI]
Orphanet 33069; Dravet syndrome.
64280; Epilepsy, childhood absence.
36387; Generalized epilepsy with febrile seizures-plus context.
PharmGKB PA28501; -.
GeneCards P18507.
Gene expression databases
ArrayExpress P18507; -.
CleanEx HS_GABRG2; -.
GermOnline ENSG00000113327; Homo sapiens.
Ontologies
GO
GO:0005887; Cellular component: integral to plasma membrane (traceable author statement from ProtInc).
GO:0008503; Molecular function: benzodiazepine receptor activity (traceable author statement from ProtInc).
GO:0005515; Molecular function: protein binding (inferred from physical interaction from UniProtKB).
GO:0007214; Biological process: gamma-aminobutyric acid signaling pathway (traceable author statement from ProtInc).
GO:0006810; Biological process: transport (traceable author statement from ProtInc).
QuickGo view.
Family and domain databases
InterPro IPR006028; GABAA_rcpt.
IPR005439; GABBAg2_rcpt.
IPR005437; GABBAg_rcpt.
IPR006029; Neu_channel_TM.
IPR006202; Neur_chan_lig_bd.
IPR006201; Neur_channel.
Graphical view of domain structure.
Gene3D G3DSA:2.70.170.10; Neur_chan_lig_bd; 1.
PANTHER PTHR18945; Neur_channel; 1.
Pfam PF02931; Neur_chan_LBD; 1.
PF02932; Neur_chan_memb; 1.
Pfam graphical view of domain structure.
PRINTS PR00253; GABAARECEPTR.
PR01620; GABAARGAMMA.
PR01622; GABAARGAMMA2.
PR00252; NRIONCHANNEL.
TIGRFAMs TIGR00860; LIC; 1.
PROSITE PS00236; NEUROTR_ION_CHANNEL; 1.
BLOCKS P18507.
Genome annotation databases
Ensembl ENSG00000113327; Homo sapiens. [Contig view]
GeneID 2566; -.
KEGG hsa:2566; -.
Phylogenomic databases
HOVERGEN P18507; -.
Other
SOURCE GABRG2; Homo sapiens.
ProtoNet P18507.
UniRef View cluster of proteins with at least 50% / 90% / 100% identity.
Keywords
Cell junction; Cell membrane; Chloride; Chloride channel; Disease mutation; Epilepsy; Glycoprotein; Ion transport; Ionic channel; Lipoprotein; Membrane; Palmitate; Postsynaptic cell membrane; Signal; Synapse; Transmembrane; Transport.
Features
SEVIEWER logo Feature table viewer FT aligner logo Feature aligner
KeyFrom   To Length Description FTId
SIGNAL   1    39  39     Potential. 
CHAIN   40   467  428     Gamma-aminobutyric acid receptor subunit gamma-2. PRO_0000000477
TOPO_DOM   40   273  234     Extracellular (Probable). 
TRANSMEM   274   296  23     Probable. 
TRANSMEM   300   322  23     Probable. 
TRANSMEM   334   356  23     Probable. 
TOPO_DOM   357   443  87     Cytoplasmic (Probable). 
TRANSMEM   444   466  23     Probable. 
REGION   425   442  18     Interaction with GABARAP (Potential). 
CARBOHYD   52    52        N-linked (GlcNAc...) (Potential). 
CARBOHYD   129   129        N-linked (GlcNAc...) (Potential). 
CARBOHYD   247   247        N-linked (GlcNAc...) (Potential). 
DISULFID   190   204        By similarity. 
VARIANT   82    82  1     R -> Q (in ECA2 and FEB8; abolishes in vitro sensitivity to diazepam). VAR_014265 
VARIANT   177   177  1     R -> G (in FEB8). VAR_038602 
VARIANT   328   328  1     K -> M (in GEFS+3). VAR_014266 
CONFLICT   120   120        T -> M (in Ref. 1; CAA33437). 
CONFLICT   181   181        T -> S (in Ref. 1; CAA33437). 
Sequence information
Length: 467 AA [This is the length of the unprocessed precursor] Molecular weight: 54162 Da [This is the MW of the unprocessed precursor] CRC64: 7450DFE1157C9224 [This is a checksum on the sequence]
        10         20         30         40         50         60 
MSSPNIWSTG SSVYSTPVFS QKMTVWILLL LSLYPGFTSQ KSDDDYEDYA SNKTWVLTPK 

        70         80         90        100        110        120 
VPEGDVTVIL NNLLEGYDNK LRPDIGVKPT LIHTDMYVNS IGPVNAINME YTIDIFFAQT 

       130        140        150        160        170        180 
WYDRRLKFNS TIKVLRLNSN MVGKIWIPDT FFRNSKKADA HWITTPNRML RIWNDGRVLY 

       190        200        210        220        230        240 
TLRLTIDAEC QLQLHNFPMD EHSCPLEFSS YGYPREEIVY QWKRSSVEVG DTRSWRLYQF 

       250        260        270        280        290        300 
SFVGLRNTTE VVKTTSGDYV VMSVYFDLSR RMGYFTIQTY IPCTLIVVLS WVSFWINKDA 

       310        320        330        340        350        360 
VPARTSLGIT TVLTMTTLST IARKSLPKVS YVTAMDLFVS VCFIFVFSAL VEYGTLHYFV 

       370        380        390        400        410        420 
SNRKPSKDKD KKKKNPAPTI DIRPRSATIQ MNNATHLQER DEEYGYECLD GKDCASFFCC 

       430        440        450        460 
FEDCRTGAWR HGRIHIRIAK MDSYARIFFP TAFCLFNLVY WVSYLYL 

P18507 in FASTA format

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