Annotations: 8INZ

Cryo-EM structure of human HCN3 channel in apo state

External Resource: Annotation

Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: PDBTM
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)
D	V-set	e8inzD1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: V-set	ECOD (v295)
C [auth B]	V-set	e8inzB1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: V-set	ECOD (v295)
B [auth A]	V-set	e8inzA1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: V-set	ECOD (v295)
A [auth C]	Ribosomal_S3Ae	e8inzC01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Ribosomal_S3Ae	ECOD (v295)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth C], B [auth A], C [auth B], D	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family
A [auth C], B [auth A], C [auth B], 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 [auth C], B [auth A], C [auth B], D	Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 3	monoatomic cation transmembrane transporter activity voltage-gated sodium channel activity monoatomic ion channel activity sodium channel activity sodium ion transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity binding adenyl ribonucleotide binding monoatomic cation transmembrane transporter activity voltage-gated sodium channel activity monoatomic ion channel activity sodium channel activity sodium ion transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity binding adenyl ribonucleotide binding cyclic nucleotide binding nucleotide binding purine ribonucleotide binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding cAMP binding adenyl nucleotide binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding gated channel activity potassium ion transmembrane transporter activity voltage-gated channel activity voltage-gated monoatomic ion channel activity potassium channel activity voltage-gated monoatomic cation channel activity voltage-gated potassium channel activity	import into cell transport monoatomic ion transmembrane transport import across plasma membrane sodium ion import across plasma membrane sodium ion transmembrane transport establishment of localization inorganic cation import across plasma membrane metal ion transport monoatomic cation transmembrane transport transmembrane transport localization inorganic ion import across plasma membrane monoatomic ion transport import into cell transport monoatomic ion transmembrane transport import across plasma membrane sodium ion import across plasma membrane sodium ion transmembrane transport establishment of localization inorganic cation import across plasma membrane metal ion transport monoatomic cation transmembrane transport transmembrane transport localization inorganic ion import across plasma membrane monoatomic ion transport cellular process monoatomic cation transport sodium ion transport potassium ion transmembrane transport potassium ion transport biological regulation regulation of biological quality regulation of membrane potential potassium ion import across plasma membrane regulation of biological process regulation of cellular process regulation of membrane depolarization membrane depolarization cellular response to nitrogen compound cellular response to stimulus response to stimulus response to organophosphorus 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 heart process multicellular organismal process system process SA node cell to atrial cardiac muscle cell signaling regulation of heart contraction SA node cell to atrial cardiac muscle cell communication regulation of system process cell communication circulatory system process regulation of cardiac muscle cell action potential regulation of multicellular organismal process cell communication involved in cardiac conduction blood circulation regulation of action potential SA node cell action potential action potential regulation of blood circulation cardiac conduction regulation of SA node cell action potential regulation of cell communication cardiac muscle cell action potential heart contraction regulation of heart rate by cardiac conduction regulation of heart rate	voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex HCN channel complex membrane plasma membrane potassium channel complex membrane protein complex cation channel complex transporter complex cell periphery cellular anatomical structure transmembrane transporter complex monoatomic ion channel complex voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex HCN channel complex membrane plasma membrane potassium channel complex membrane protein complex cation channel complex transporter complex cell periphery cellular anatomical structure transmembrane transporter complex monoatomic ion channel complex axon cell projection neuron projection plasma membrane bounded cell projection somatodendritic compartment dendrite dendritic tree

InterPro: Protein Family Classification InterPro Database Homepage

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

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth C], B [auth A], C [auth B], D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	HCN3 hyperpolarization-activated channel

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.