5JON | pdb_00005jon

Crystal structure of the unliganded form of HCN2 CNBD

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	CagX	e5jonB4	A: a/b three-layered sandwiches	X: SMI1/KNR4-like	H: SMI1/KNR4-like	T: SMI1/KNR4-like	F: CagX	ECOD (v294.1)
A	Nqo3_Fer4	e5jonA1	A: a/b three-layered sandwiches	X: Rossmann-like	H: Formate dehydrogenase/DMSO reductase, domains 2 and 3	T: Formate dehydrogenase/DMSO reductase, domains 2 and 3	F: Nqo3_Fer4	ECOD (v294.1)
A	KWL1	e5jonA2	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KWL1	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.120.10	Mainly Beta	Sandwich	Jelly Rolls	Jelly Rolls	CATH (utative)
A	2.60.120.10	Mainly Beta	Sandwich	Jelly Rolls	Jelly Rolls	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01547	Bacterial extracellular solute-binding protein (SBP_bac_1)	Bacterial extracellular solute-binding protein	-	Family
A, B	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	Maltose-binding periplasmic protein,Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2	protein binding binding PDZ domain binding protein domain specific binding monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion 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 monoatomic cation channel activity passive transmembrane transporter activity protein binding binding PDZ domain binding protein domain specific binding monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion 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 monoatomic cation channel activity passive transmembrane transporter activity voltage-gated potassium channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity voltage-gated sodium channel activity sodium channel activity sodium ion transmembrane transporter activity 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 protein-containing complex binding molecular adaptor activity intracellularly ligand-gated monoatomic ion 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 ligand-gated monoatomic cation channel activity cyclic nucleotide-activated monoatomic ion channel activity identical protein binding carbohydrate transmembrane transporter activity oligosaccharide binding disaccharide binding carbohydrate binding maltose binding	transmembrane transport localization nitrogen compound transport transport ammonium transmembrane transport cellular process establishment of localization response to stimulus response to chemical response to xenobiotic stimulus monoatomic ion transmembrane transport potassium ion transmembrane transport metal ion transport monoatomic cation transmembrane transport transmembrane transport localization nitrogen compound transport transport ammonium transmembrane transport cellular process establishment of localization response to stimulus response to chemical response to xenobiotic stimulus monoatomic ion transmembrane transport potassium ion transmembrane transport metal ion transport monoatomic cation transmembrane transport monoatomic ion transport potassium ion transport monoatomic cation transport cellular response to stimulus response to ketone response to lipid cellular response to mineralocorticoid stimulus response to mineralocorticoid cellular response to endogenous stimulus cellular response to aldehyde response to hormone response to steroid hormone cellular response to ketone cellular response to steroid hormone stimulus cellular response to hormone stimulus cellular response to aldosterone response to aldosterone response to endogenous stimulus response to alcohol response to oxygen-containing compound cellular response to oxygen-containing compound cellular response to corticosteroid stimulus response to corticosteroid cellular response to chemical stimulus cellular response to alcohol cellular response to lipid 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 response to organophosphorus response to nitrogen compound response to purine-containing compound response to cAMP cellular response to cAMP sodium ion transmembrane transport sodium ion transport import into cell import across plasma membrane sodium ion import across plasma membrane inorganic cation import across plasma membrane inorganic ion import across plasma membrane potassium ion import across plasma membrane cellular response to cGMP response to cGMP carbohydrate transport oligosaccharide transport disaccharide transport maltose transport polysaccharide localization dextrin transport macromolecule localization maltodextrin transmembrane transport polysaccharide transport	somatodendritic compartment cellular anatomical structure membrane cell periphery plasma membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection cell leading edge leading edge membrane neuron projection membrane dendrite membrane somatodendritic compartment cellular anatomical structure membrane cell periphery plasma membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection cell leading edge leading edge membrane neuron projection membrane dendrite membrane plasma membrane region cell projection membrane dendritic shaft 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 cell body neuronal cell body axon ATPase dependent transmembrane transport complex ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing ATP-binding cassette (ABC) transporter complex extracellular region outer membrane-bounded periplasmic space cell envelope periplasmic space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013621	Ion transport N-terminal	Domain
A, B	IPR014710	RmlC-like jelly roll fold	Homologous Superfamily
A, B	IPR018488	Cyclic nucleotide-binding, conserved site	Conserved Site
A, B	IPR005821	Ion transport domain	Domain
A, B	IPR051413	Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel	Family
A, B	IPR003938	Potassium channel, voltage-dependent, EAG/ELK/ERG-like	Family
A, B	IPR000595	Cyclic nucleotide-binding domain	Domain
A, B	IPR018490	Cyclic nucleotide-binding domain superfamily	Homologous Superfamily
A, B	IPR006060	Maltose/Cyclodextrin ABC transporter, substrate-binding protein	Family
A, B	IPR006059	Bacterial-type extracellular solute-binding protein	Family
A, B	IPR006061	Solute-binding family 1, conserved site	Conserved Site

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.