Annotations: 9GU3

Human adult muscle nAChR in desensitised state in nanodisc with 1 mM acetylcholine

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
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F [auth C]	Beta-Casp	e9gu3C1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
H [auth G]	Beta-Casp	e9gu3G1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
G [auth F]	Beta-Casp	e9gu3F1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
I [auth H]	Beta-Casp	e9gu3H1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth C], H [auth G]	Light Chain	IGKV22	Kappa	acetylcholine receptor subunit alpha	SAbDab (2026-06-12)
G [auth F], I [auth H]	Heavy Chain	IGHV2	-	acetylcholine receptor subunit alpha	SAbDab (2026-06-12)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth 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
C [auth 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
D [auth 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
D [auth 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
B	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	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, E [auth L]	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, E [auth L]	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
C [auth D]	Acetylcholine receptor subunit delta	neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity cation binding acetylcholine binding ion binding binding small molecule binding transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity cation binding acetylcholine binding ion binding binding small molecule binding transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential 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 transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity excitatory extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity acetylcholine-gated monoatomic cation-selective channel activity ligand-gated monoatomic cation channel activity	transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction developmental process developmental growth skeletal muscle tissue development animal organ development growth tissue development striated muscle tissue development muscle structure development skeletal muscle organ development skeletal muscle tissue growth anatomical structure development muscle tissue development muscle organ development cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction cell communication trans-synaptic signaling synaptic signaling anterograde trans-synaptic signaling cell-cell signaling chemical synaptic transmission membrane depolarization regulation of biological quality regulation of membrane potential cellular response to nitrogen compound cellular response to acetylcholine response to oxygen-containing compound response to nitrogen compound acetylcholine receptor signaling pathway postsynaptic signal transduction cellular response to oxygen-containing compound cellular response to chemical stimulus response to chemical response to acetylcholine	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane postsynaptic specialization membrane postsynaptic specialization organelle cell projection cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane postsynaptic specialization membrane postsynaptic specialization organelle cell projection neuron projection plasma membrane bounded cell projection neuromuscular junction protein-containing complex plasma membrane protein complex membrane protein complex transporter complex acetylcholine-gated channel complex transmembrane transporter complex plasma membrane signaling receptor complex signaling receptor complex monoatomic ion channel complex
F [auth C], H [auth G]	Fab35 light chain	-	-	-
G [auth F], I [auth H]	Fab35 heavy chain	-	-	-
D [auth E]	Acetylcholine receptor subunit epsilon,Green fluorescent protein	neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity passive transmembrane transporter activity neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential 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 transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity excitatory extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity acetylcholine-gated monoatomic cation-selective channel activity ligand-gated monoatomic cation channel activity	transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction cell communication trans-synaptic signaling synaptic signaling anterograde trans-synaptic signaling cell-cell signaling chemical synaptic transmission membrane depolarization regulation of biological quality regulation of membrane potential cellular response to nitrogen compound cellular response to acetylcholine response to oxygen-containing compound response to nitrogen compound acetylcholine receptor signaling pathway postsynaptic signal transduction cellular response to oxygen-containing compound cellular response to chemical stimulus response to chemical response to acetylcholine synaptic transmission, cholinergic	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell projection neuron projection plasma membrane bounded cell projection neuromuscular junction cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell projection neuron projection plasma membrane bounded cell projection neuromuscular junction protein-containing complex plasma membrane protein complex membrane protein complex transporter complex acetylcholine-gated channel complex transmembrane transporter complex plasma membrane signaling receptor complex signaling receptor complex monoatomic ion channel complex
B	Acetylcholine receptor subunit beta	ligand-gated channel activity ligand-gated monoatomic ion channel activity passive transmembrane transporter activity gated channel activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity cation binding acetylcholine binding ion binding binding small molecule binding ligand-gated channel activity ligand-gated monoatomic ion channel activity passive transmembrane transporter activity gated channel activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity cation binding acetylcholine binding ion binding binding small molecule binding transmitter-gated monoatomic ion channel activity molecular transducer activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential signaling receptor activity neurotransmitter receptor activity extracellular ligand-gated monoatomic ion channel activity transmitter-gated channel activity monoatomic cation transmembrane transporter activity excitatory extracellular ligand-gated monoatomic ion channel activity postsynaptic neurotransmitter receptor activity monoatomic cation channel activity acetylcholine-gated monoatomic cation-selective channel activity ligand-gated monoatomic cation channel activity transmembrane signaling receptor activity	transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction monoatomic cation transport cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction cell communication trans-synaptic signaling cell-cell signaling chemical synaptic transmission synaptic signaling anterograde trans-synaptic signaling neuromuscular synaptic transmission membrane organization cellular component organization cell junction organization postsynapse organization cellular component organization or biogenesis synapse organization postsynaptic membrane organization regulation of biological quality regulation of membrane potential membrane depolarization behavior adult behavior response to chemical response to nicotine behavioral response to nicotine developmental process muscle structure development muscle cell development cellular developmental process cell differentiation anatomical structure development cell development muscle cell differentiation cellular response to nitrogen compound cellular response to acetylcholine response to oxygen-containing compound response to nitrogen compound acetylcholine receptor signaling pathway postsynaptic signal transduction cellular response to oxygen-containing compound cellular response to chemical stimulus response to acetylcholine synaptic transmission, cholinergic	cell periphery cellular anatomical structure plasma membrane membrane postsynaptic specialization membrane postsynaptic specialization synapse synaptic membrane postsynapse organelle postsynaptic membrane cell junction plasma membrane region cell projection cell periphery cellular anatomical structure plasma membrane membrane postsynaptic specialization membrane postsynaptic specialization synapse synaptic membrane postsynapse organelle postsynaptic membrane cell junction plasma membrane region cell projection neuron projection plasma membrane bounded cell projection neuromuscular junction protein-containing complex plasma membrane protein complex membrane protein complex transporter complex acetylcholine-gated channel complex transmembrane transporter complex plasma membrane signaling receptor complex signaling receptor complex monoatomic ion channel complex
A, E [auth L]	Acetylcholine receptor subunit alpha	neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity cation binding acetylcholine binding ion binding binding small molecule binding transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity neurotransmitter receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity signaling receptor activity transmembrane signaling receptor activity acetylcholine receptor activity cation binding acetylcholine binding ion binding binding small molecule binding transmitter-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential 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 transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity excitatory extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity acetylcholine-gated monoatomic cation-selective channel activity ligand-gated monoatomic cation channel activity	trans-synaptic signaling regulation of biological process regulation of signaling regulation of cellular process modulation of chemical synaptic transmission signaling biological regulation cell-cell signaling presynaptic modulation of chemical synaptic transmission chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling trans-synaptic signaling regulation of biological process regulation of signaling regulation of cellular process modulation of chemical synaptic transmission signaling biological regulation cell-cell signaling presynaptic modulation of chemical synaptic transmission chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication cellular process cellular component organization cell junction organization neuromuscular junction development synapse organization cellular component organization or biogenesis transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport establishment of localization multicellular organismal movement musculoskeletal movement multicellular organismal process system process nervous system process neuromuscular process skeletal muscle contraction muscle contraction muscle system process striated muscle contraction developmental process developmental growth skeletal muscle tissue development animal organ development growth tissue development striated muscle tissue development muscle structure development skeletal muscle organ development skeletal muscle tissue growth anatomical structure development muscle tissue development muscle organ development neuromuscular synaptic transmission action potential transmission of nerve impulse neuronal action potential regulation of biological quality regulation of membrane potential membrane depolarization response to stimulus response to chemical response to nicotine cellular response to nitrogen compound cellular response to stimulus cellular response to acetylcholine response to oxygen-containing compound response to nitrogen compound acetylcholine receptor signaling pathway postsynaptic signal transduction cellular response to oxygen-containing compound cellular response to chemical stimulus response to acetylcholine signal transduction synaptic transmission, cholinergic cellular homeostasis homeostatic process muscle cell cellular homeostasis neuron cellular homeostasis	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell surface postsynaptic specialization membrane postsynaptic specialization organelle cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell surface postsynaptic specialization membrane postsynaptic specialization organelle presynapse cell projection neuron projection plasma membrane bounded cell projection neuromuscular junction protein-containing complex plasma membrane protein complex membrane protein complex transporter complex acetylcholine-gated channel complex transmembrane transporter complex plasma membrane signaling receptor complex signaling receptor complex monoatomic ion channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth D]	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
C [auth D]	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
C [auth D]	IPR002394	Nicotinic acetylcholine receptor	Family
C [auth D]	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
C [auth D]	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
C [auth D]	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
C [auth D]	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
C [auth D]	IPR006201	Neurotransmitter-gated ion-channel	Family
D [auth E]	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
D [auth E]	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
D [auth E]	IPR002394	Nicotinic acetylcholine receptor	Family
D [auth E]	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
D [auth E]	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
D [auth E]	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
D [auth E]	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
D [auth E]	IPR006201	Neurotransmitter-gated ion-channel	Family
B	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
B	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
B	IPR002394	Nicotinic acetylcholine receptor	Family
B	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
B	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
B	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
B	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
B	IPR006201	Neurotransmitter-gated ion-channel	Family
A, E [auth L]	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
A, E [auth L]	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
A, E [auth L]	IPR002394	Nicotinic acetylcholine receptor	Family
A, E [auth L]	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
A, E [auth L]	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
A, E [auth L]	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
A, E [auth L]	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
A, E [auth L]	IPR006201	Neurotransmitter-gated ion-channel	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth D]	: Q07001	congenital myasthenic syndrome congenital myasthenic syndrome 3A lethal multiple pterygium syndrome congenital myasthenic syndrome 3B congenital myasthenic syndrome 3C multiple pterygium syndrome Myasthenic Syndrome, Congenital, with Facial Dysmorphism, associated with Acetylcholine Receptor Deficiency myasthenic syndrome, congenital, 1B, fast-channel peripheral nervous system disease arthrogryposis palsy peripheral neuropathy congenital myasthenic syndrome 1A myopathy
D [auth E]	: Q04844	congenital myasthenic syndrome congenital myasthenic syndrome 4B congenital myasthenic syndrome 4A myasthenic syndrome, congenital, 1B, fast-channel congenital myasthenic syndrome 4C Skeletal Muscle Relaxation for Endotracheal Intubation in C-Section arthrogryposis peripheral neuropathy systemic lupus erythematosus attention deficit hyperactivity disorder, inattentive type congenital myasthenic syndrome 1A brain aneurysm peripheral nervous system disease
B	: P11230	congenital myasthenic syndrome congenital myasthenic syndrome 2A congenital myasthenic syndrome 2C Myasthenic Syndrome, Congenital, with Facial Dysmorphism, associated with Acetylcholine Receptor Deficiency uterine corpus leiomyoma arthrogryposis malignant mesothelioma atrial fibrillation congenital myasthenic syndrome 1A congenital myasthenic syndrome 4C cystic fibrosis peripheral nervous system disease central nervous system cancer peripheral neuropathy
A, E [auth L]	: P02708	congenital myasthenic syndrome myasthenic syndrome, congenital, 1B, fast-channel lethal multiple pterygium syndrome multiple pterygium syndrome congenital myasthenic syndrome 1A Fibrosis myopathy peripheral neuropathy amyotrophic lateral sclerosis Becker muscular dystrophy Emery-Dreifuss muscular dystrophy malignant glioma non-immune hydrops fetalis pituitary cancer arthrogryposis congenital myasthenic syndrome myasthenic syndrome, congenital, 1B, fast-channel lethal multiple pterygium syndrome multiple pterygium syndrome congenital myasthenic syndrome 1A Fibrosis myopathy peripheral neuropathy amyotrophic lateral sclerosis Becker muscular dystrophy Emery-Dreifuss muscular dystrophy malignant glioma non-immune hydrops fetalis pituitary cancer arthrogryposis juvenile dermatomyositis limb-girdle muscular dystrophy medulloblastoma peripheral nervous system disease psoriasis ulcerative colitis atrial fibrillation Duchenne muscular dystrophy large cell medulloblastoma lung cancer

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C [auth D], D [auth E], E [auth L]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C [auth D], D [auth E], E [auth L]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Cys-Loop Receptor Family	nicotinic acetylcholine receptor nAChR α₂βδε, resting state in detergent with alpha-bungarotoxin