Annotations: 9HNT

a5b3 GABAAR bound to Etomidate, GABA, and Mb25 in a desensitized state in saposin nanodiscs

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)
F [auth P]	PAD_N	e9hntP1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
E	PAD_N	e9hntE1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
C	PAD_N	e9hntC1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
B	PAD_N	e9hntB1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
D	PAD_N	e9hntD1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
A	PAD_N	e9hntA1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth P]	Heavy Chain	IGHV1	-	gamma-aminobutyric acid receptor subunit beta-3,gamma-aminobutyric acid receptor subunit beta-3,gamma-aminobutyric acid receptor subunit beta-3,green fluorescent protein \| gamma-aminobutyric acid receptor subunit beta-3,gamma-aminobutyric acid receptor subunit beta-3,gamma-aminobutyric acid receptor subunit beta-3,green fluorescent protein	SAbDab (2026-09-25)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B, C, 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, 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	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	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 [auth P]	Megabody 25	-	-	-
B, C, E	Gamma-aminobutyric acid receptor subunit beta-3,Gamma-aminobutyric acid receptor subunit beta-3,Gamma-aminobutyric acid receptor subunit beta-3,Green fluorescent protein	protein binding binding signaling receptor binding 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 protein binding binding signaling receptor binding 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	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 sexual reproduction reproductive process cellular process involved in reproduction in multicellular organism developmental process involved in reproduction gamete generation chromatin organization chromatin remodeling regulation of biosynthetic process epigenetic programming of gene expression epigenetic regulation of gene expression multicellular organismal reproductive process regulation of macromolecule metabolic process gene expression genomic imprinting macromolecule biosynthetic process regulation of gene expression biosynthetic process germ cell development regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process 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	Green fluorescent protein,Gamma-aminobutyric acid receptor subunit alpha-5	molecular transducer activity signaling receptor activity transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity gated channel activity monoatomic ion channel 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 molecular transducer activity signaling receptor activity transmitter-gated monoatomic ion channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity GABA-gated chloride ion channel activity gated channel activity monoatomic ion channel 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 ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential protein binding binding signaling receptor binding GABA receptor binding GABA-A receptor activity GABA receptor activity transmembrane signaling receptor activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential	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 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 cellular response to stimulus regulation of cellular process response to stimulus 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 trans-synaptic signaling synaptic transmission, GABAergic chemical synaptic transmission synaptic signaling anterograde trans-synaptic signaling nerve development innervation	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane presynapse presynaptic membrane postsynaptic specialization membrane postsynaptic specialization cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane presynapse presynaptic membrane postsynaptic specialization membrane postsynaptic specialization organelle GABA receptor complex protein-containing complex signaling receptor complex GABA-A receptor complex GABA-ergic synapse 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 neuronal cell body membrane cell body cell body membrane neuronal cell body

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, C, E	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
B, C, E	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
B, C, E	IPR006028	Gamma-aminobutyric acid A receptor/Glycine receptor alpha	Family
B, C, E	IPR002289	Gamma-aminobutyric-acid A receptor, beta subunit	Family
B, C, E	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
B, C, E	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
B, C, E	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
B, C, E	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
B, C, E	IPR006201	Neurotransmitter-gated ion-channel	Family
A, D	IPR001390	Gamma-aminobutyric-acid A receptor, alpha subunit	Family
A, D	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
A, D	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
A, D	IPR006028	Gamma-aminobutyric acid A receptor/Glycine receptor alpha	Family
A, D	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
A, D	IPR005435	Gamma-aminobutyric-acid A receptor, alpha 5 subunit	Family
A, D	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
A, D	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
A, D	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
A, D	IPR047024	Gamma-aminobutyric acid receptor subunit alpha 1-6, transmembrane domain	Domain
A, D	IPR006201	Neurotransmitter-gated ion-channel	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B, C, 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 gastric carcinoma pilocytic astrocytoma glioblastoma primitive neuroectodermal tumor bipolar disorder interstitial cystitis brain injury juvenile absence epilepsy malignant glioma Sjogren syndrome mixed anxiety and depressive disorder epilepsy with generalized tonic-clonic seizures oligodendroglioma epilepsy, childhood absence, susceptibility to, 1 pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia peptic ulcer disease pituitary cancer psoriasis irritable bowel syndrome schizoaffective disorder large cell medulloblastoma lung carcinoma Crohn disease medulloblastoma alcohol withdrawal delirium early myoclonic encephalopathy tetanus panic disorder atypical teratoid rhabdoid tumor Pick disease generalized anxiety disorder Prader-Willi syndrome
A, D	: P31644	Social Communication Disorder epilepsy visual epilepsy status epilepticus mixed anxiety and depressive disorder duplication/inversion 15q11 oligodendroglioma pilocytic astrocytoma hydrolethalus syndrome primitive neuroectodermal tumor intellectual disability atypical teratoid rhabdoid tumor malignant ependymoma breast cancer tetanus Social Communication Disorder epilepsy visual epilepsy status epilepticus mixed anxiety and depressive disorder duplication/inversion 15q11 oligodendroglioma pilocytic astrocytoma hydrolethalus syndrome primitive neuroectodermal tumor intellectual disability atypical teratoid rhabdoid tumor malignant ependymoma breast cancer tetanus peptic ulcer disease glioblastoma schizoaffective disorder astrocytic tumor irritable bowel syndrome autism large cell medulloblastoma malignant glioma epilepsy with generalized tonic-clonic seizures panic disorder generalized anxiety disorder Pick disease alcohol withdrawal delirium insomnia schizophrenia autism spectrum disorder medulloblastoma bipolar disorder