Annotations: 6HIS

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	e6hisA2	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	e6hisA1	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 [auth E]	Neur_chan_LBD	e6hisE1	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 [auth E]	Neur_chan_memb	e6hisE2	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 [auth B]	Neur_chan_LBD	e6hisB1	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 [auth B]	Neur_chan_memb	e6hisB2	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 [auth C]	Neur_chan_LBD	e6hisC1	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 [auth C]	Neur_chan_memb	e6hisC2	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 [auth D]	Neur_chan_LBD	e6hisD2	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 [auth D]	Neur_chan_memb	e6hisD1	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)

Protein Family Annotation Pfam Database Homepage

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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B [auth E], C [auth B], D [auth C], E [auth D]	5-hydroxytryptamine receptor 3A	cation binding binding ion binding serotonin binding organic cyclic compound binding amine binding heterocyclic compound binding small molecule binding transmitter-gated monoatomic ion channel activity monoatomic cation transmembrane transporter activity molecular transducer activity gated channel activity monoatomic ion channel activity serotonin-gated monoatomic cation channel activity cation binding binding ion binding serotonin binding organic cyclic compound binding amine binding heterocyclic compound binding small molecule binding transmitter-gated monoatomic ion channel activity monoatomic cation transmembrane transporter activity molecular transducer activity gated channel activity monoatomic ion channel activity serotonin-gated monoatomic cation channel activity signaling receptor activity neurotransmitter receptor activity ligand-gated channel activity ligand-gated monoatomic ion channel activity extracellular ligand-gated monoatomic ion channel activity monoatomic cation channel activity passive transmembrane transporter activity serotonin receptor activity channel activity transmembrane signaling receptor activity transmitter-gated channel activity monoatomic ion transmembrane transporter activity transporter activity ligand-gated monoatomic cation channel activity transmembrane transporter activity ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential identical protein binding protein binding	cellular response to nitrogen compound cellular response to stimulus response to dopamine regulation of cellular process ligand-gated ion channel signaling pathway response to stimulus signaling cellular response to dopamine response to monoamine cell communication response to catecholamine serotonin-gated cation-selective signaling pathway cellular response to catecholamine stimulus signal transduction cellular response to nitrogen compound cellular response to stimulus response to dopamine regulation of cellular process ligand-gated ion channel signaling pathway response to stimulus signaling cellular response to dopamine response to monoamine cell communication response to catecholamine serotonin-gated cation-selective signaling pathway cellular response to catecholamine stimulus signal transduction response to organic cyclic compound regulation of biological process serotonin receptor signaling pathway cellular response to organic cyclic compound biological regulation response to oxygen-containing compound response to nitrogen compound cellular response to oxygen-containing compound cellular response to chemical stimulus cellular response to monoamine stimulus response to chemical cellular process transmembrane transport localization transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell division site cleavage furrow protein-containing complex serotonin-activated cation-selective channel complex cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane cell division site cleavage furrow protein-containing complex serotonin-activated cation-selective channel complex plasma membrane protein complex membrane protein complex cation channel complex transporter complex receptor complex neurotransmitter receptor complex transmembrane transporter complex plasma membrane signaling receptor complex serotonin receptor complex monoatomic ion channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR018000	Neurotransmitter-gated ion-channel, conserved site	Conserved Site
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR038050	Neuronal acetylcholine receptor	Homologous Superfamily
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR006202	Neurotransmitter-gated ion-channel ligand-binding domain	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR036719	Neurotransmitter-gated ion-channel transmembrane domain superfamily	Homologous Superfamily
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR049944	5-hydroxytryptamine 3 receptor, transmembrane domain	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR006029	Neurotransmitter-gated ion-channel transmembrane domain	Domain
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR008133	5-hydroxytryptamine 3 receptor, A subunit	Family
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR008132	5-hydroxytryptamine 3 receptor	Family
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR036734	Neurotransmitter-gated ion-channel ligand-binding domain superfamily	Homologous Superfamily
A, B [auth E], C [auth B], D [auth C], E [auth D]	IPR006201	Neurotransmitter-gated ion-channel	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B [auth E], C [auth B], D [auth C], E [auth D]	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 [auth E], C [auth B], D [auth C], E [auth D]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B [auth E], C [auth B], D [auth C], E [auth D]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Cys-Loop Receptor Family	Serotonin 5-HT_3A receptor with bound serotonin, F conformation

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729.