Annotations: 8PET

Cryo-EM structure of the full-length human alpha1beta3 GABA(A) receptor (babba arrangement) in complex with nanobody Nb25, expressed with a 5-fold excess of beta3 over alpha1

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth C]	DNA_topoisoIV	e8petC1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: DNA_topoisoIV	ECOD (v295)
A	DNA_topoisoIV	e8petA1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: DNA_topoisoIV	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F	Heavy Chain	IGHV1	-	gamma-aminobutyric acid receptor subunit beta-3 \| gamma-aminobutyric acid receptor subunit beta-3	SAbDab (2026-06-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, C [auth D], E	PF02932	Neurotransmitter-gated ion-channel transmembrane region (Neur_chan_memb)	Neurotransmitter-gated ion-channel transmembrane region	This family includes the four transmembrane helices that form the ion channel.	Domain
B, C [auth D], E	PF02931	Neurotransmitter-gated ion-channel ligand binding domain (Neur_chan_LBD)	Neurotransmitter-gated ion-channel ligand binding domain	This family is the extracellular ligand binding domain of these ion channels [1]. This domain forms a pentameric arrangement in the known structure.	Domain
A, D [auth C]	PF02932	Neurotransmitter-gated ion-channel transmembrane region (Neur_chan_memb)	Neurotransmitter-gated ion-channel transmembrane region	This family includes the four transmembrane helices that form the ion channel.	Domain
A, D [auth C]	PF02931	Neurotransmitter-gated ion-channel ligand binding domain (Neur_chan_LBD)	Neurotransmitter-gated ion-channel ligand binding domain	This family is the extracellular ligand binding domain of these ion channels [1]. This domain forms a pentameric arrangement in the known structure.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F	Nanobody Nb25	-	-	-
B, C [auth D], E	Gamma-aminobutyric acid receptor subunit beta-3	transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity molecular transducer activity gated channel activity monoatomic ion channel activity signaling receptor activity ligand-gated monoatomic anion channel activity neurotransmitter receptor activity ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity passive transmembrane transporter activity channel activity transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity molecular transducer activity gated channel activity monoatomic ion channel activity signaling receptor activity ligand-gated monoatomic anion channel activity neurotransmitter receptor activity ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity passive transmembrane transporter activity channel activity transmitter-gated channel activity monoatomic ion transmembrane transporter activity monoatomic anion channel activity transporter activity transmembrane transporter activity chloride channel activity GABA-A receptor activity GABA receptor activity transmembrane signaling receptor activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential identical protein binding protein binding binding	developmental process ear development sensory organ development inner ear development cochlea development anatomical structure development animal organ development animal gross anatomical part developmental process transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization developmental process ear development sensory organ development inner ear development cochlea development anatomical structure development animal organ development animal gross anatomical part developmental process transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport cellular response to nitrogen compound cellular response to stimulus cellular response to chemical stimulus response to histamine response to stimulus response to chemical cellular response to histamine response to nitrogen compound multicellular organismal process mechanoreceptor differentiation inner ear receptor cell development cellular developmental process cell development nervous system development inner ear receptor cell differentiation generation of neurons neurogenesis multicellular organism development neuron differentiation cell differentiation neuron development system development regulation of biological process signaling biological regulation cell-cell signaling gamma-aminobutyric acid signaling pathway cell communication regulation of cellular process signal transduction inhibitory synapse assembly cellular component organization cellular component biogenesis cell junction organization cellular component assembly cell junction assembly synapse organization cellular component organization or biogenesis synapse assembly regulation of postsynaptic membrane potential system process chemical synaptic transmission, postsynaptic synaptic signaling regulation of biological quality trans-synaptic signaling cell surface receptor signaling pathway nervous system process chemical synaptic transmission anterograde trans-synaptic signaling inhibitory postsynaptic potential regulation of membrane potential synaptic transmission, GABAergic nerve development innervation negative regulation of synaptic transmission, GABAergic negative regulation of signaling modulation of chemical synaptic transmission negative regulation of biological process negative regulation of synaptic transmission negative regulation of cell communication negative regulation of cellular process regulation of signaling regulation of trans-synaptic signaling regulation of cell communication regulation of synaptic transmission, GABAergic extrasynaptic signaling via GABA roof of mouth development	protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex cell periphery postsynapse postsynaptic membrane synapse cell junction plasma membrane protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex cell periphery postsynapse postsynaptic membrane synapse cell junction plasma membrane plasma membrane region synaptic membrane cell surface postsynaptic specialization membrane postsynaptic specialization organelle GABA receptor complex signaling receptor complex GABA-A receptor complex GABA-ergic synapse membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle membrane vesicle membrane cytoplasmic vesicle cytoplasm vesicle organelle membrane neuron spine neuron projection dendritic spine plasma membrane bounded cell projection somatodendritic compartment cell projection dendrite dendritic tree
A, D [auth C]	Gamma-aminobutyric acid receptor subunit alpha-1	transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity molecular transducer activity gated channel activity monoatomic ion channel activity signaling receptor activity ligand-gated monoatomic anion channel activity neurotransmitter receptor activity ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity passive transmembrane transporter activity channel activity transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity molecular transducer activity gated channel activity monoatomic ion channel activity signaling receptor activity ligand-gated monoatomic anion channel activity neurotransmitter receptor activity ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity passive transmembrane transporter activity channel activity transmitter-gated channel activity monoatomic ion transmembrane transporter activity monoatomic anion channel activity transporter activity transmembrane transporter activity chloride channel activity GABA-A receptor activity GABA receptor activity transmembrane signaling receptor activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential	transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport regulation of biological process signaling transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport regulation of biological process signaling biological regulation cell-cell signaling gamma-aminobutyric acid signaling pathway cell communication developmental process multicellular organismal process inhibitory synapse assembly nervous system development cellular component organization cellular component biogenesis multicellular organism development cell junction organization cellular component assembly cell junction assembly anatomical structure development synapse organization cellular component organization or biogenesis synapse assembly animal gross anatomical part developmental process system development trans-synaptic signaling synaptic transmission, GABAergic chemical synaptic transmission synaptic signaling anterograde trans-synaptic signaling extrasynaptic signaling via GABA	protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex GABA receptor complex signaling receptor complex cell periphery plasma membrane postsynaptic specialization membrane postsynaptic specialization protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex GABA receptor complex signaling receptor complex cell periphery plasma membrane postsynaptic specialization membrane postsynaptic specialization synapse synaptic membrane postsynapse organelle postsynaptic membrane cell junction plasma membrane region GABA-A receptor complex GABA-ergic synapse membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle membrane vesicle membrane cytoplasmic vesicle cytoplasm vesicle organelle membrane cell leading edge neuron projection leading edge membrane plasma membrane bounded cell projection somatodendritic compartment neuron projection membrane cell projection dendrite membrane dendrite dendritic tree cell projection membrane neuron spine dendritic spine

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, C [auth D], E	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
B, C [auth D], E	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
B, C [auth D], E	IPR006028	Gamma-aminobutyric acid A receptor/Glycine receptor alpha	Family
B, C [auth D], E	IPR002289	Gamma-aminobutyric-acid A receptor, beta subunit	Family
B, C [auth D], E	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
B, C [auth D], E	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
B, C [auth D], E	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
B, C [auth D], E	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
B, C [auth D], E	IPR006201	Neurotransmitter-gated ion-channel	Family
A, D [auth C]	IPR001390	Gamma-aminobutyric-acid A receptor, alpha subunit	Family
A, D [auth C]	IPR005431	Gamma-aminobutyric-acid A receptor, alpha 1 subunit	Family
A, D [auth C]	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
A, D [auth C]	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
A, D [auth C]	IPR006028	Gamma-aminobutyric acid A receptor/Glycine receptor alpha	Family
A, D [auth C]	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
A, D [auth C]	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
A, D [auth C]	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
A, D [auth C]	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
A, D [auth C]	IPR047024	Gamma-aminobutyric acid receptor subunit alpha 1-6, transmembrane domain	Domain
A, D [auth C]	IPR047079	Gamma-aminobutyric acid receptor subunit alpha-1, extracellular domain	Domain
A, D [auth C]	IPR006201	Neurotransmitter-gated ion-channel	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B, C [auth D], E	: P28472	Angelman syndrome epilepsy childhood absence epilepsy Lennox-Gastaut syndrome developmental and epileptic encephalopathy, 43 epilepsy, childhood absence, susceptibility to, 5 absence epilepsy autism insomnia autism spectrum disorder intellectual disability schizophrenia malignant ependymoma depressive disorder duplication/inversion 15q11 Angelman syndrome epilepsy childhood absence epilepsy Lennox-Gastaut syndrome developmental and epileptic encephalopathy, 43 epilepsy, childhood absence, susceptibility to, 5 absence epilepsy autism insomnia autism spectrum disorder intellectual disability schizophrenia malignant ependymoma depressive disorder duplication/inversion 15q11 status epilepticus pancreatic intraductal papillary-mucinous neoplasm astrocytic tumor pilocytic astrocytoma gastric carcinoma glioblastoma primitive neuroectodermal tumor bipolar disorder brain injury interstitial cystitis juvenile absence epilepsy malignant glioma Sjogren syndrome mixed anxiety and depressive disorder oligodendroglioma epilepsy with generalized tonic-clonic seizures pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia epilepsy, childhood absence, susceptibility to, 1 peptic ulcer disease pituitary cancer psoriasis schizoaffective disorder irritable bowel syndrome large cell medulloblastoma lung carcinoma Crohn disease medulloblastoma alcohol withdrawal delirium early myoclonic encephalopathy tetanus panic disorder atypical teratoid rhabdoid tumor Pick disease Prader-Willi syndrome generalized anxiety disorder
A, D [auth C]	: P14867	developmental and epileptic encephalopathy, 19 juvenile myoclonic epilepsy hepatic encephalopathy essential tremor epilepsy childhood absence epilepsy epilepsy, idiopathic generalized, susceptibility to, 13 hepatic coma amyotrophic lateral sclerosis type 1 Ataxia pilocytic astrocytoma atypical teratoid rhabdoid tumor generalized anxiety disorder primitive neuroectodermal tumor bipolar disorder developmental and epileptic encephalopathy, 19 juvenile myoclonic epilepsy hepatic encephalopathy essential tremor epilepsy childhood absence epilepsy epilepsy, idiopathic generalized, susceptibility to, 13 hepatic coma amyotrophic lateral sclerosis type 1 Ataxia pilocytic astrocytoma atypical teratoid rhabdoid tumor generalized anxiety disorder primitive neuroectodermal tumor bipolar disorder irritable bowel syndrome Lennox-Gastaut syndrome malignant glioma Dravet syndrome mixed anxiety and depressive disorder EJM1 oligodendroglioma epilepsy with generalized tonic-clonic seizures anxiety disorder Parkinson disease peptic ulcer disease autism glioblastoma pseudotumor cerebri insomnia alcohol abuse status epilepticus developmental and epileptic encephalopathy, 6 medulloblastoma tetanus ovarian cyst astrocytic tumor partial epilepsy Pick disease schizophrenia intellectual disability corpus luteum cyst large cell medulloblastoma alcohol withdrawal delirium subependymal giant cell astrocytoma malignant ependymoma early myoclonic encephalopathy panic disorder