Annotations: 6UQG

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	cNMP_binding_1	e6uqgA2	A: beta sandwiches	X: jelly-roll	H: Double-stranded beta-helix (From Topology)	T: Double-stranded beta-helix	F: cNMP_binding_1	ECOD (1.6)
A	Ion_trans_2_1	e6uqgA1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2_1	ECOD (1.6)
B	cNMP_binding_1	e6uqgB2	A: beta sandwiches	X: jelly-roll	H: Double-stranded beta-helix (From Topology)	T: Double-stranded beta-helix	F: cNMP_binding_1	ECOD (1.6)
B	Ion_trans_2_1	e6uqgB1	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2_1	ECOD (1.6)
C	cNMP_binding_1	e6uqgC1	A: beta sandwiches	X: jelly-roll	H: Double-stranded beta-helix (From Topology)	T: Double-stranded beta-helix	F: cNMP_binding_1	ECOD (1.6)
C	Ion_trans_2_1	e6uqgC2	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2_1	ECOD (1.6)
D	cNMP_binding_1	e6uqgD1	A: beta sandwiches	X: jelly-roll	H: Double-stranded beta-helix (From Topology)	T: Double-stranded beta-helix	F: cNMP_binding_1	ECOD (1.6)
D	Ion_trans_2_1	e6uqgD2	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans_2_1	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF08412	Ion transport protein N-terminal (Ion_trans_N)	Ion transport protein N-terminal	-	Family
A, B, C, D	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family
A, B, C, D	PF00027	Cyclic nucleotide-binding domain (cNMP_binding)	Cyclic nucleotide-binding domain	This domain sensor domain can bind cAMP, cGMP, c-di-GMP, oxygen and 2-oxoglutarate (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1	monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity intracellularly ligand-gated monoatomic ion channel activity monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity intracellularly ligand-gated monoatomic ion channel activity gated channel activity intracellularly cyclic nucleotide-activated monoatomic cation channel activity ligand-gated channel activity ligand-gated monoatomic ion channel activity intracellularly cAMP-activated cation channel activity intracellular cAMP-activated cation channel activity involved in regulation of presynaptic membrane potential ligand-gated monoatomic cation channel activity cyclic nucleotide-activated monoatomic ion channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic cation channel activity voltage-gated potassium channel activity voltage-gated sodium channel activity sodium channel activity sodium ion transmembrane transporter activity binding adenyl ribonucleotide binding cyclic nucleotide binding nucleotide binding purine ribonucleotide binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding cAMP binding adenyl nucleotide binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding identical protein binding protein binding	protein localization localization cellular localization apical protein localization cellular macromolecule localization macromolecule localization cellular process transport monoatomic ion transmembrane transport potassium ion transmembrane transport inorganic ion transmembrane transport establishment of localization metal ion transport inorganic cation transmembrane transport protein localization localization cellular localization apical protein localization cellular macromolecule localization macromolecule localization cellular process transport monoatomic ion transmembrane transport potassium ion transmembrane transport inorganic ion transmembrane transport establishment of localization metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport monoatomic ion transport potassium ion transport monoatomic cation transport behavior multicellular organismal process general adaptation syndrome response to stimulus response to stress general adaptation syndrome, behavioral process multicellular organismal response to stress protein-containing complex organization protein homotetramerization cellular component organization cellular component biogenesis cellular component assembly protein complex oligomerization protein tetramerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis regulation of biological process regulation of cellular process regulation of membrane depolarization membrane depolarization biological regulation regulation of biological quality regulation of membrane potential cellular response to nitrogen compound cellular response to stimulus response to organophosphorus cellular response to organic cyclic compound response to oxygen-containing compound response to nitrogen compound response to purine-containing compound response to cAMP cellular response to oxygen-containing compound cellular response to chemical stimulus response to chemical cellular response to cAMP response to organic cyclic compound sodium ion transmembrane transport sodium ion transport system process nervous system process action potential transmission of nerve impulse cell communication neuronal action potential cellular developmental process sensory organ development photoreceptor cell differentiation visual system development retina development in camera-type eye cell development neural retina development eye morphogenesis multicellular organism development neurogenesis neuron differentiation cell differentiation retinal cone cell differentiation eye photoreceptor cell differentiation anatomical structure development animal organ morphogenesis sensory system development system development photoreceptor cell development developmental process camera-type eye morphogenesis eye development eye photoreceptor cell development animal organ development retinal cone cell development nervous system development camera-type eye photoreceptor cell differentiation generation of neurons retina morphogenesis in camera-type eye anatomical structure morphogenesis sensory organ morphogenesis neuron development camera-type eye development	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane somatodendritic compartment cell projection dendrite dendritic tree cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection glutamatergic synapse presynaptic active zone membrane presynaptic membrane presynapse presynaptic active zone voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex HCN channel complex potassium channel complex membrane protein complex cation channel complex transporter complex transmembrane transporter complex monoatomic ion channel complex axon

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR013621	Ion transport N-terminal	Domain
A, B, C, D	IPR014710	RmlC-like jelly roll fold	Homologous Superfamily
A, B, C, D	IPR018488	Cyclic nucleotide-binding, conserved site	Conserved Site
A, B, C, D	IPR005821	Ion transport domain	Domain
A, B, C, D	IPR051413	Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel	Family
A, B, C, D	IPR003938	Potassium channel, voltage-dependent, EAG/ELK/ERG-like	Family
A, B, C, D	IPR000595	Cyclic nucleotide-binding domain	Domain
A, B, C, D	IPR018490	Cyclic nucleotide-binding domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	Pharos: O60741	developmental and epileptic encephalopathy, 24 epilepsy developmental and epileptic encephalopathy, 1 Ataxia visual epilepsy astrocytic tumor large cell medulloblastoma malignant glioma atypical teratoid rhabdoid tumor pilocytic astrocytoma depressive disorder intellectual disability lung carcinoma atrial fibrillation medulloblastoma developmental and epileptic encephalopathy, 24 epilepsy developmental and epileptic encephalopathy, 1 Ataxia visual epilepsy astrocytic tumor large cell medulloblastoma malignant glioma atypical teratoid rhabdoid tumor pilocytic astrocytoma depressive disorder intellectual disability lung carcinoma atrial fibrillation medulloblastoma breast carcinoma oligodendroglioma primitive neuroectodermal tumor developmental and epileptic encephalopathy glioblastoma malignant ependymoma attention deficit hyperactivity disorder, inattentive type autism spectrum disorder

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	Cyclic nucleotide-gated ion channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	HCN1 hyperpolarization-activated channel in hyperpolarized 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.