Annotations: 6W2X

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Type 1 solute binding protein-like	8077987	3000125	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF00003	e6w2xA3	A: alpha bundles	X: Family A G protein-coupled receptor-like (From Topology)	H: Family A G protein-coupled receptor-like (From Topology)	T: Family A G protein-coupled receptor-like	F: PF00003	ECOD (1.6)
A	PF01094	e6w2xA1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Periplasmic binding protein-like I	F: PF01094	ECOD (1.6)
B	PF00003	e6w2xB3	A: alpha bundles	X: Family A G protein-coupled receptor-like (From Topology)	H: Family A G protein-coupled receptor-like (From Topology)	T: Family A G protein-coupled receptor-like	F: PF00003	ECOD (1.6)
B	PF01094	e6w2xB1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Periplasmic binding protein-like I	F: PF01094	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01094	Receptor family ligand binding region (ANF_receptor)	Receptor family ligand binding region	-	Family
A	PF00003	7 transmembrane sweet-taste receptor of 3 GCPR (7tm_3)	7 transmembrane sweet-taste receptor of 3 GCPR	This is a domain of seven transmembrane regions that forms the C-terminus of some subclass 3 G-coupled-protein receptors. It is often associated with a downstream cysteine-rich linker domain, NCD3G Pfam:PF07562, which is the human sweet-taste recepto ...	This is a domain of seven transmembrane regions that forms the C-terminus of some subclass 3 G-coupled-protein receptors. It is often associated with a downstream cysteine-rich linker domain, NCD3G Pfam:PF07562, which is the human sweet-taste receptor, and the N-terminal domain, ANF_receptor Pfam:PF01094. The seven TM regions assemble in such a way as to produce a docking pocket into which such molecules as cyclamate and lactisole have been found to bind and consequently confer the taste of sweetness [1].	Domain
B	PF01094	Receptor family ligand binding region (ANF_receptor)	Receptor family ligand binding region	-	Family
B	PF00003	7 transmembrane sweet-taste receptor of 3 GCPR (7tm_3)	7 transmembrane sweet-taste receptor of 3 GCPR	This is a domain of seven transmembrane regions that forms the C-terminus of some subclass 3 G-coupled-protein receptors. It is often associated with a downstream cysteine-rich linker domain, NCD3G Pfam:PF07562, which is the human sweet-taste recepto ...	This is a domain of seven transmembrane regions that forms the C-terminus of some subclass 3 G-coupled-protein receptors. It is often associated with a downstream cysteine-rich linker domain, NCD3G Pfam:PF07562, which is the human sweet-taste receptor, and the N-terminal domain, ANF_receptor Pfam:PF01094. The seven TM regions assemble in such a way as to produce a docking pocket into which such molecules as cyclamate and lactisole have been found to bind and consequently confer the taste of sweetness [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Gamma-aminobutyric acid type B receptor subunit 1	neurotransmitter receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity G protein-coupled neurotransmitter receptor activity G protein-coupled neurotransmitter receptor activity involved in regulation of presynaptic membrane potential G protein-coupled receptor activity involved in regulation of postsynaptic membrane potential postsynaptic neurotransmitter receptor activity neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential G protein-coupled neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential protein binding binding extracellular matrix protein binding neurotransmitter receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity G protein-coupled neurotransmitter receptor activity G protein-coupled neurotransmitter receptor activity involved in regulation of presynaptic membrane potential G protein-coupled receptor activity involved in regulation of postsynaptic membrane potential postsynaptic neurotransmitter receptor activity neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential G protein-coupled neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential protein binding binding extracellular matrix protein binding protein heterodimerization activity protein dimerization activity G protein-coupled GABA receptor activity GABA receptor activity	developmental process multicellular organismal process cellular developmental process ossification cell differentiation cellular process osteoblast differentiation regulation of biological process signaling biological regulation cell-cell signaling neuron-glial cell signaling cell communication gamma-aminobutyric acid signaling pathway developmental process multicellular organismal process cellular developmental process ossification cell differentiation cellular process osteoblast differentiation regulation of biological process signaling biological regulation cell-cell signaling neuron-glial cell signaling cell communication gamma-aminobutyric acid signaling pathway regulation of localization negative regulation of amino acid transport nitrogen compound transport negative regulation of amine transport transport negative regulation of biological process negative regulation of transport localization negative regulation of secretion gamma-aminobutyric acid transport negative regulation of gamma-aminobutyric acid secretion regulation of amino acid transport organic anion transport gamma-aminobutyric acid secretion carboxylic acid transport regulation of transport secretion regulation of gamma-aminobutyric acid secretion organic substance transport acid secretion establishment of localization regulation of secretion organic acid transport amino acid transport amine transport negative regulation of organic acid transport regulation of organic acid transport regulation of amine transport monoamine transport regulation of cellular process regulation of catecholamine secretion organic hydroxy compound transport dopamine transport secretion by cell regulation of secretion by cell catecholamine transport negative regulation of dopamine secretion signal release negative regulation of cellular process negative regulation of secretion by cell export from cell negative regulation of catecholamine secretion dopamine secretion catecholamine secretion regulation of dopamine secretion response to organic substance response to stimulus response to alcohol response to chemical response to oxygen-containing compound response to ethanol negative regulation of cell population proliferation cell population proliferation regulation of cell population proliferation epinephrine secretion epinephrine transport regulation of epinephrine secretion organic cation transport negative regulation of epinephrine secretion cellular response to stimulus adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction trans-synaptic signaling regulation of signaling negative regulation of signaling modulation of chemical synaptic transmission negative regulation of synaptic transmission negative regulation of cell communication chemical synaptic transmission synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication synaptic transmission, GABAergic response to nicotine positive regulation of cell communication regulation of biological quality regulation of peptide hormone secretion regulation of hormone levels positive regulation of peptide hormone secretion positive regulation of growth hormone secretion regulation of hormone secretion regulation of peptide secretion positive regulation of biological process positive regulation of secretion by cell hormone secretion peptide secretion positive regulation of hormone secretion positive regulation of secretion amide transport positive regulation of cellular process positive regulation of peptide secretion growth hormone secretion regulation of growth hormone secretion regulation of peptide transport peptide transport positive regulation of transport peptide hormone secretion hormone transport positive regulation of signaling regulation of glutamate secretion positive regulation of amine transport glutamate secretion positive regulation of glutamate secretion positive regulation of organic acid transport acidic amino acid transport positive regulation of amino acid transport dicarboxylic acid transport	cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane protein-containing complex plasma membrane protein complex membrane protein complex receptor complex cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane protein-containing complex plasma membrane protein complex membrane protein complex receptor complex GABA receptor complex G protein-coupled receptor dimeric complex plasma membrane signaling receptor complex G protein-coupled receptor complex G protein-coupled GABA receptor complex membrane-bounded organelle mitochondrial membrane intracellular anatomical structure mitochondrion intracellular membrane-bounded organelle intracellular organelle organelle envelope mitochondrial envelope organelle cytoplasm organelle membrane G protein-coupled receptor heterodimeric complex presynapse presynaptic membrane GABA-ergic synapse glutamatergic synapse organelle subcompartment endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum endoplasmic reticulum membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection dendritic shaft plasma membrane bounded cell projection neuron spine dendritic spine Schaffer collateral - CA1 synapse axon cell leading edge axolemma leading edge membrane neuron projection membrane main axon cell projection membrane cell body neuronal cell body extracellular region extracellular space transport vesicle intracellular vesicle cytoplasmic vesicle synaptic vesicle secretory vesicle vesicle exocytic vesicle
B	Gamma-aminobutyric acid type B receptor subunit 2	protein heterodimerization activity protein binding binding protein dimerization activity G protein-coupled GABA receptor activity GABA receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity	regulation of biological process signaling biological regulation cell-cell signaling neuron-glial cell signaling cellular process cell communication gamma-aminobutyric acid signaling pathway regulation of catalytic activity negative regulation of molecular function negative regulation of catalytic activity negative regulation of adenylate cyclase activity regulation of molecular function regulation of lyase activity regulation of biological process signaling biological regulation cell-cell signaling neuron-glial cell signaling cellular process cell communication gamma-aminobutyric acid signaling pathway regulation of catalytic activity negative regulation of molecular function negative regulation of catalytic activity negative regulation of adenylate cyclase activity regulation of molecular function regulation of lyase activity negative regulation of lyase activity regulation of adenylate cyclase activity negative regulation of cyclase activity regulation of cyclase activity trans-synaptic signaling synaptic signaling anterograde trans-synaptic signaling chemical synaptic transmission cellular response to stimulus regulation of cellular process response to stimulus adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction synaptic transmission, GABAergic	cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane protein-containing complex plasma membrane protein complex membrane protein complex receptor complex cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region cellular anatomical entity synaptic membrane protein-containing complex plasma membrane protein complex membrane protein complex receptor complex GABA receptor complex G protein-coupled receptor dimeric complex plasma membrane signaling receptor complex G protein-coupled receptor complex G protein-coupled GABA receptor complex G protein-coupled receptor heterodimeric complex intracellular anatomical structure cytoplasm cell projection neuron projection plasma membrane bounded cell projection

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR017978	GPCR family 3, C-terminal	Domain
A	IPR000436	Sushi/SCR/CCP domain	Domain
A	IPR002455	GPCR family 3, GABA-B receptor	Family
A	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily
A	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
A	IPR002456	GPCR family 3, gamma-aminobutyric acid receptor, type B1	Family
A	IPR001828	Receptor, ligand binding region	Domain
B	IPR017978	GPCR family 3, C-terminal	Domain
B	IPR017979	GPCR, family 3, conserved site	Conserved Site
B	IPR002457	GPCR family 3, gamma-aminobutyric acid receptor, type B2	Family
B	IPR000337	GPCR, family 3	Family
B	IPR002455	GPCR family 3, GABA-B receptor	Family
B	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
B	IPR041689	Gamma-aminobutyric acid type B receptor subunit 2, coiled-coil domain	Domain
B	IPR001828	Receptor, ligand binding region	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: Q9UBS5	alcohol abuse cocaine dependence cocaine abuse lymphoplasmacytic lymphoma medulloblastoma narcolepsy pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma atypical teratoid rhabdoid tumor psoriatic arthritis Autistic Disorder tuberculosis endogenous depression lung cancer malignant ependymoma alcohol abuse cocaine dependence cocaine abuse lymphoplasmacytic lymphoma medulloblastoma narcolepsy pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma atypical teratoid rhabdoid tumor psoriatic arthritis Autistic Disorder tuberculosis endogenous depression lung cancer malignant ependymoma nasopharyngeal disease pancreatic intraductal papillary-mucinous neoplasm primitive neuroectodermal tumor autism schizophrenia glioblastoma lung carcinoma malignant glioma osteosarcoma Pick disease psoriasis autism spectrum disorder subependymal giant cell astrocytoma cutaneous lupus erythematosus large cell medulloblastoma
B	Pharos: O75899	Muscle spasticity of spinal origin nicotine dependence pituitary cancer subependymal giant cell astrocytoma adrenal cortex adenoma atypical teratoid rhabdoid tumor interstitial cystitis major depressive disorder medulloblastoma narcolepsy oligodendroglioma primitive neuroectodermal tumor astrocytic tumor autism developmental and epileptic encephalopathy, 59 Muscle spasticity of spinal origin nicotine dependence pituitary cancer subependymal giant cell astrocytoma adrenal cortex adenoma atypical teratoid rhabdoid tumor interstitial cystitis major depressive disorder medulloblastoma narcolepsy oligodendroglioma primitive neuroectodermal tumor astrocytic tumor autism developmental and epileptic encephalopathy, 59 glioblastoma interstitial lung disease malignant ependymoma neurodevelopmental disorder with poor language and loss of hand skills pilocytic astrocytoma psoriasis atypical Rett syndrome epilepsy intellectual disability large cell medulloblastoma malignant glioma

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Transmembrane	Alpha-helical polytopic	Rhodopsin-like receptors and pumps	GPCR Metabotropic glutamate receptor (C) family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class C	GABA_B1 homodimeric receptor in an inactive state

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.