Annotations: 5KXI

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Neur_chan_LBD	e5kxiA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Nicotinic receptor ligand binding domain-like (From Topology)	T: Nicotinic receptor ligand binding domain-like	F: Neur_chan_LBD	ECOD (1.6)
A	Neur_chan_memb	e5kxiA1	A: alpha bundles	X: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	H: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	T: Neurotransmitter-gated ion-channel transmembrane pore	F: Neur_chan_memb	ECOD (1.6)
D	Neur_chan_LBD	e5kxiD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Nicotinic receptor ligand binding domain-like (From Topology)	T: Nicotinic receptor ligand binding domain-like	F: Neur_chan_LBD	ECOD (1.6)
D	Neur_chan_memb	e5kxiD2	A: alpha bundles	X: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	H: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	T: Neurotransmitter-gated ion-channel transmembrane pore	F: Neur_chan_memb	ECOD (1.6)
B	Neur_chan_LBD	e5kxiB2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Nicotinic receptor ligand binding domain-like (From Topology)	T: Nicotinic receptor ligand binding domain-like	F: Neur_chan_LBD	ECOD (1.6)
B	Neur_chan_memb	e5kxiB1	A: alpha bundles	X: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	H: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	T: Neurotransmitter-gated ion-channel transmembrane pore	F: Neur_chan_memb	ECOD (1.6)
C	Neur_chan_LBD	e5kxiC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Nicotinic receptor ligand binding domain-like (From Topology)	T: Nicotinic receptor ligand binding domain-like	F: Neur_chan_LBD	ECOD (1.6)
C	Neur_chan_memb	e5kxiC2	A: alpha bundles	X: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	H: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	T: Neurotransmitter-gated ion-channel transmembrane pore	F: Neur_chan_memb	ECOD (1.6)
E	Neur_chan_LBD	e5kxiE2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Nicotinic receptor ligand binding domain-like (From Topology)	T: Nicotinic receptor ligand binding domain-like	F: Neur_chan_LBD	ECOD (1.6)
E	Neur_chan_memb	e5kxiE1	A: alpha bundles	X: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	H: Neurotransmitter-gated ion-channel transmembrane pore (From Topology)	T: Neurotransmitter-gated ion-channel transmembrane pore	F: Neur_chan_memb	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.70.170.10	Mainly Beta	Distorted Sandwich	Acetylcholine Binding Protein	Chain: A,	CATH (utative)
D	2.70.170.10	Mainly Beta	Distorted Sandwich	Acetylcholine Binding Protein	Chain: A,	CATH (utative)
B	2.70.170.10	Mainly Beta	Distorted Sandwich	Acetylcholine Binding Protein	Chain: A,	CATH (utative)
C	2.70.170.10	Mainly Beta	Distorted Sandwich	Acetylcholine Binding Protein	Chain: A,	CATH (utative)
E	2.70.170.10	Mainly Beta	Distorted Sandwich	Acetylcholine Binding Protein	Chain: A,	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Identifier	Description	Comments	Source
A, D	PF02932	Neurotransmitter-gated ion-channel transmembrane region (Neur_chan_memb)	Neurotransmitter-gated ion-channel transmembrane region	-	Family
A, D	PF02931	Neurotransmitter-gated ion-channel ligand binding domain (Neur_chan_LBD)	Neurotransmitter-gated ion-channel ligand binding domain	-	Family
B, C, E	PF02932	Neurotransmitter-gated ion-channel transmembrane region (Neur_chan_memb)	Neurotransmitter-gated ion-channel transmembrane region	-	Family
B, C, E	PF02931	Neurotransmitter-gated ion-channel ligand binding domain (Neur_chan_LBD)	Neurotransmitter-gated ion-channel ligand binding domain	-	Family

Gene Product Annotation Gene Product Annotation

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, D	Neuronal acetylcholine receptor subunit alpha-4	binding neurotransmitter binding acetylcholine binding ion binding cation binding quaternary ammonium group binding transmembrane signaling receptor activity acetylcholine receptor activity neurotransmitter receptor activity signaling receptor activity molecular transducer activity postsynaptic neurotransmitter receptor activity transporter activity monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity excitatory extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity monoatomic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity channel activity ligand-gated monoatomic ion channel activity passive transmembrane transporter activity transmitter-gated monoatomic ion channel activity ligand-gated channel activity transmitter-gated channel activity gated channel activity monoatomic ion gated channel activity acetylcholine-gated monoatomic cation-selective channel activity transmembrane transporter activity ligand-gated monoatomic cation channel activity neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential	regulation of membrane potential membrane depolarization biological regulation regulation of biological quality response to nicotine response to chemical response to stimulus	plasma membrane acetylcholine-gated channel complex membrane protein-containing complex monoatomic ion channel complex receptor complex cell periphery membrane protein complex plasma membrane protein complex plasma membrane signaling receptor complex cellular anatomical entity transmembrane transporter complex transporter complex cell junction anchoring junction dendrite somatodendritic compartment cell projection neuron projection dendritic tree plasma membrane bounded cell projection external side of plasma membrane cell surface side of membrane neuronal cell body cell body synapse postsynaptic membrane synaptic membrane plasma membrane region postsynapse
B, C, E	Neuronal acetylcholine receptor subunit beta-2	binding neurotransmitter binding acetylcholine binding ion binding cation binding quaternary ammonium group binding transmembrane signaling receptor activity acetylcholine receptor activity neurotransmitter receptor activity signaling receptor activity molecular transducer activity postsynaptic neurotransmitter receptor activity transporter activity monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity excitatory extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity monoatomic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity channel activity ligand-gated monoatomic ion channel activity passive transmembrane transporter activity transmitter-gated monoatomic ion channel activity ligand-gated channel activity transmitter-gated channel activity gated channel activity monoatomic ion gated channel activity acetylcholine-gated monoatomic cation-selective channel activity transmembrane transporter activity ligand-gated monoatomic cation channel activity neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential heterocyclic compound binding protein-containing complex binding	regulation of membrane potential membrane depolarization biological regulation regulation of biological quality response to organic substance response to organonitrogen compound response to chemical response to stimulus response to nitrogen compound response to oxygen-containing compound response to salt response to acetylcholine response to organic cyclic compound response to cocaine response to alkaloid response to ethanol response to alcohol response to nicotine	plasma membrane acetylcholine-gated channel complex membrane protein-containing complex monoatomic ion channel complex receptor complex cell periphery membrane protein complex plasma membrane protein complex plasma membrane signaling receptor complex cellular anatomical entity transmembrane transporter complex transporter complex cell junction anchoring junction synapse cholinergic synapse external side of plasma membrane cell surface side of membrane cell projection neuron projection plasma membrane bounded cell projection plasma membrane raft membrane raft plasma membrane region membrane microdomain

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D, E	OPM	Transmembrane	Alpha-helical polytopic	Pentameric ligand-gated ion channels	Ligand-gated ion channel of neurotransmitter receptors

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D, E	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Cys-Loop Receptor Family	Nicotinic Acetylcholine α4β2 Receptor

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.