Annotations: 7CR3

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth F]	PF00036	e7cr3F1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF00036	ECOD (1.6)
B [auth F]	PF13499	e7cr3F2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF13499	ECOD (1.6)
D [auth C]	PF00036	e7cr3C1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF00036	ECOD (1.6)
D [auth C]	PF13499	e7cr3C2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF13499	ECOD (1.6)
F [auth E]	PF00036	e7cr3E2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF00036	ECOD (1.6)
F [auth E]	PF13499	e7cr3E1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF13499	ECOD (1.6)
H	PF00036	e7cr3H1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF00036	ECOD (1.6)
H	PF13499	e7cr3H2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: PF13499	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B [auth F], D [auth C], F [auth E], H	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair	-	Domain
A, C [auth B], E [auth D], G	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth F], D [auth C], F [auth E], H	Calmodulin-3	cytoskeletal protein binding titin binding protein binding binding enzyme regulator activity protein phosphatase activator activity enzyme activator activity phosphatase activator activity molecular function activator activity phosphatase regulator activity molecular function regulator activity protein phosphatase regulator activity enzyme binding adenylate cyclase binding cytoskeletal protein binding titin binding protein binding binding enzyme regulator activity protein phosphatase activator activity enzyme activator activity phosphatase activator activity molecular function activator activity phosphatase regulator activity molecular function regulator activity protein phosphatase regulator activity enzyme binding adenylate cyclase binding cyclase regulator activity cyclase activator activity adenylate cyclase regulator activity adenylate cyclase activator activity protein serine/threonine kinase activator activity kinase activator activity protein kinase activator activity protein kinase regulator activity kinase regulator activity cation binding ion binding calcium ion binding metal ion binding small molecule binding transmembrane transporter binding kinase binding protein kinase binding calcium-dependent protein binding	heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process regulation of biological quality heart contraction blood circulation regulation of heart rate heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process regulation of biological quality heart contraction blood circulation regulation of heart rate positive regulation of phosphoprotein phosphatase activity protein dephosphorylation regulation of cellular process regulation of phosphatase activity regulation of catalytic activity positive regulation of phosphate metabolic process regulation of primary metabolic process positive regulation of metabolic process regulation of phosphate metabolic process phosphate-containing compound metabolic process positive regulation of phosphatase activity positive regulation of macromolecule metabolic process phosphorus metabolic process protein modification process positive regulation of phosphorus metabolic process positive regulation of dephosphorylation regulation of dephosphorylation cellular metabolic process dephosphorylation regulation of protein metabolic process regulation of cellular metabolic process primary metabolic process regulation of molecular function regulation of hydrolase activity macromolecule modification regulation of phosphorus metabolic process metabolic process macromolecule metabolic process regulation of metabolic process regulation of protein modification process positive regulation of protein metabolic process positive regulation of biological process positive regulation of cellular metabolic process regulation of phosphoprotein phosphatase activity positive regulation of molecular function positive regulation of protein modification process organic substance metabolic process protein metabolic process positive regulation of cellular process organonitrogen compound metabolic process regulation of protein dephosphorylation positive regulation of catalytic activity positive regulation of protein dephosphorylation regulation of macromolecule metabolic process positive regulation of hydrolase activity cellular process regulation of calcium ion transmembrane transporter activity regulation of calcium ion transport regulation of localization negative regulation of ion transmembrane transporter activity negative regulation of calcium ion transmembrane transporter activity intracellular calcium ion homeostasis negative regulation of biological process negative regulation of ryanodine-sensitive calcium-release channel activity negative regulation of transport calcium ion transport localization negative regulation of cation transmembrane transport monoatomic cation homeostasis monoatomic cation transport intracellular monoatomic ion homeostasis regulation of release of sequestered calcium ion into cytosol regulation of monoatomic ion transport inorganic ion transmembrane transport establishment of localization regulation of cation channel activity inorganic cation transmembrane transport maintenance of location transmembrane transport release of sequestered calcium ion into cytosol regulation of transmembrane transport chemical homeostasis negative regulation of calcium ion transmembrane transport cellular localization inorganic ion homeostasis transport negative regulation of cation channel activity homeostatic process monoatomic ion transmembrane transport negative regulation of monoatomic ion transport regulation of transmembrane transporter activity calcium ion homeostasis regulation of monoatomic ion transmembrane transport negative regulation of sequestering of calcium ion metal ion transport negative regulation of transmembrane transport regulation of transporter activity maintenance of location in cell regulation of calcium ion transmembrane transport monoatomic cation transmembrane transport positive regulation of sequestering of calcium ion negative regulation of monoatomic ion transmembrane transport negative regulation of release of sequestered calcium ion into cytosol intracellular monoatomic cation homeostasis negative regulation of cellular process monoatomic ion homeostasis monoatomic ion transport intracellular chemical homeostasis regulation of metal ion transport regulation of sequestering of calcium ion regulation of monoatomic ion transmembrane transporter activity calcium ion transmembrane import into cytosol regulation of transport sequestering of calcium ion negative regulation of transporter activity negative regulation of molecular function negative regulation of calcium ion transport cellular homeostasis regulation of ryanodine-sensitive calcium-release channel activity regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport response to stimulus response to metal ion response to chemical response to calcium ion response to inorganic substance sarcoplasmic reticulum calcium ion transport release of sequestered calcium ion into cytosol by sarcoplasmic reticulum release of sequestered calcium ion into cytosol by endoplasmic reticulum regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum negative regulation of voltage-gated calcium channel activity regulation of voltage-gated calcium channel activity negative regulation of high voltage-gated calcium channel activity regulation of high voltage-gated calcium channel activity regulation of cytokinesis regulation of cell cycle process cytokinesis regulation of cell division cell division cell cycle regulation of cell cycle cell cycle process positive regulation of cyclic-nucleotide phosphodiesterase activity regulation of cyclic-nucleotide phosphodiesterase activity cellular response to stimulus cardiac muscle contraction intracellular signal transduction cell communication intracellular signaling cassette signal transduction regulation of cardiac muscle contraction muscle contraction regulation of striated muscle contraction calcium-mediated signaling regulation of muscle contraction signaling regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion striated muscle contraction regulation of cardiac muscle contraction by calcium ion signaling muscle system process regulation of muscle system process positive regulation of phosphorylation regulation of transferase activity positive regulation of protein serine/threonine kinase activity positive regulation of protein phosphorylation protein phosphorylation phosphorylation positive regulation of kinase activity regulation of kinase activity regulation of protein serine/threonine kinase activity regulation of protein phosphorylation positive regulation of protein kinase activity positive regulation of transferase activity regulation of protein kinase activity regulation of phosphorylation cell cycle G2/M phase transition mitotic cell cycle process G2/M transition of mitotic cell cycle cell cycle phase transition mitotic cell cycle mitotic cell cycle phase transition regulation of peptidyl-threonine phosphorylation negative regulation of phosphate metabolic process negative regulation of cellular metabolic process negative regulation of protein modification process peptidyl-amino acid modification peptidyl-threonine modification negative regulation of protein metabolic process negative regulation of macromolecule metabolic process negative regulation of metabolic process negative regulation of protein phosphorylation negative regulation of peptidyl-threonine phosphorylation negative regulation of phosphorus metabolic process negative regulation of phosphorylation peptidyl-threonine phosphorylation positive regulation of peptidyl-threonine phosphorylation cell communication by electrical coupling involved in cardiac conduction cell communication by electrical coupling regulation of cell communication by electrical coupling involved in cardiac conduction cardiac conduction regulation of cell communication cell communication involved in cardiac conduction regulation of cell communication by electrical coupling export across plasma membrane negative regulation of calcium ion export across plasma membrane regulation of calcium ion export across plasma membrane calcium ion export across plasma membrane export from cell positive regulation of cation transmembrane transport positive regulation of calcium ion transport positive regulation of monoatomic ion transport positive regulation of monoatomic ion transmembrane transport positive regulation of cation channel activity positive regulation of calcium ion transmembrane transporter activity positive regulation of calcium ion transmembrane transport positive regulation of transmembrane transport positive regulation of release of sequestered calcium ion into cytosol positive regulation of ryanodine-sensitive calcium-release channel activity positive regulation of transport positive regulation of transporter activity positive regulation of ion transmembrane transporter activity developmental process head development animal organ development brain development nervous system development substantia nigra development multicellular organism development central nervous system development midbrain development anatomical structure development neural nucleus development system development regulation of signaling regulation of signal transduction regulation of intracellular signal transduction regulation of response to stimulus regulation of calcium-mediated signaling regulation of action potential regulation of cardiac muscle cell action potential action potential cardiac muscle cell action potential regulation of membrane potential G protein-coupled receptor signaling pathway protein autophosphorylation regulation of protein autophosphorylation positive regulation of protein autophosphorylation detection of stimulus detection of chemical stimulus detection of calcium ion	intracellular organelle intracellular anatomical structure cytoskeleton spindle organelle intracellular non-membrane-bounded organelle spindle pole cellular anatomical entity microtubule cytoskeleton non-membrane-bounded organelle membrane-bounded organelle cell projection sperm midpiece cilium intracellular organelle intracellular anatomical structure cytoskeleton spindle organelle intracellular non-membrane-bounded organelle spindle pole cellular anatomical entity microtubule cytoskeleton non-membrane-bounded organelle membrane-bounded organelle cell projection sperm midpiece cilium 9+2 motile cilium sperm flagellum motile cilium plasma membrane bounded cell projection cytoplasm protein-containing complex transmembrane transporter complex membrane membrane protein complex cation channel complex transporter complex calcium channel complex monoatomic ion channel complex sarcomere contractile muscle fiber supramolecular fiber myofibril supramolecular polymer supramolecular complex myelin sheath vesicle centrosome microtubule organizing center cell periphery plasma membrane catalytic complex voltage-gated potassium channel complex plasma membrane protein complex potassium channel complex polymeric cytoskeletal fiber spindle microtubule microtubule nucleus intracellular membrane-bounded organelle
A, C [auth B], E [auth D], G	Potassium voltage-gated channel subfamily KQT member 2	cytoskeletal protein binding ankyrin binding protein binding binding calmodulin 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 cytoskeletal protein binding ankyrin binding protein binding binding calmodulin 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 inorganic molecular entity transmembrane transporter activity channel activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity	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 localization monoatomic ion transport potassium ion transport cellular process monoatomic cation transport 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 localization monoatomic ion transport potassium ion transport cellular process monoatomic cation transport developmental process multicellular organism development multicellular organismal process anatomical structure development nervous system development system development trans-synaptic signaling synaptic signaling regulation of biological process signaling anterograde trans-synaptic signaling biological regulation cell-cell signaling chemical synaptic transmission cell communication	axon cell projection main axon neuron projection cellular anatomical entity node of Ranvier plasma membrane bounded cell projection synapse cell junction cell periphery plasma membrane membrane axon initial segment voltage-gated potassium channel complex axon cell projection main axon neuron projection cellular anatomical entity node of Ranvier plasma membrane bounded cell projection synapse cell junction cell periphery plasma membrane membrane axon initial segment voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex potassium channel complex membrane protein complex cation channel complex transporter complex transmembrane transporter complex monoatomic ion channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth F], D [auth C], F [auth E], H	IPR002048	EF-hand domain	Domain
B [auth F], D [auth C], F [auth E], H	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
B [auth F], D [auth C], F [auth E], H	IPR011992	EF-hand domain pair	Homologous Superfamily
A, C [auth B], E [auth D], G	IPR005821	Ion transport domain	Domain
A, C [auth B], E [auth D], G	IPR020969	Ankyrin-G binding site	Binding Site
A, C [auth B], E [auth D], G	IPR013821	Potassium channel, voltage dependent, KCNQ, C-terminal	Domain
A, C [auth B], E [auth D], G	IPR003947	Potassium channel, voltage dependent, KCNQ2	Family
A, C [auth B], E [auth D], G	IPR003937	Potassium channel, voltage dependent, KCNQ	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B [auth F], D [auth C], F [auth E], H	Pharos: P0DP25	catecholaminergic polymorphic ventricular tachycardia long QT syndrome subependymal giant cell astrocytoma Ventricular arrhythmia astrocytic tumor breast cancer glioblastoma malignant ependymoma oligodendroglioma Pick disease psoriasis atypical teratoid rhabdoid tumor large cell medulloblastoma malignant glioma osteosarcoma catecholaminergic polymorphic ventricular tachycardia long QT syndrome subependymal giant cell astrocytoma Ventricular arrhythmia astrocytic tumor breast cancer glioblastoma malignant ependymoma oligodendroglioma Pick disease psoriasis atypical teratoid rhabdoid tumor large cell medulloblastoma malignant glioma osteosarcoma pilocytic astrocytoma sclerosing cholangitis ulcerative colitis B-cell chronic lymphocytic leukemia Gaucher disease medulloblastoma ovarian cancer primitive neuroectodermal tumor
A, C [auth B], E [auth D], G	Pharos: O43526	developmental and epileptic encephalopathy, 7 epilepsy seizures, benign familial neonatal, 1 benign neonatal seizures intellectual disability brain disease benign familial neonatal epilepsy visual epilepsy nervous system disorder oligodendroglioma developmental and epileptic encephalopathy, 1 pilocytic astrocytoma developmental disability schizophrenia Epilepsy, Cryptogenic developmental and epileptic encephalopathy, 7 epilepsy seizures, benign familial neonatal, 1 benign neonatal seizures intellectual disability brain disease benign familial neonatal epilepsy visual epilepsy nervous system disorder oligodendroglioma developmental and epileptic encephalopathy, 1 pilocytic astrocytoma developmental disability schizophrenia Epilepsy, Cryptogenic seizures, benign familial infantile, 3 seizures, benign familial neonatal, 2 atypical teratoid rhabdoid tumor subependymal giant cell astrocytoma benign familial infantile epilepsy large cell medulloblastoma malignant glioma multiple sclerosis chronic obstructive pulmonary disease primitive neuroectodermal tumor astrocytic tumor glioblastoma major affective disorder 2 malignant mesothelioma nicotine dependence developmental and epileptic encephalopathy Pick disease rolandic epilepsy Lambert-Eaton myasthenic syndrome malignant ependymoma bipolar disorder medulloblastoma

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, C [auth B], E [auth D], G	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	KCNQ voltage-gated potassium channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, C [auth B], E [auth D], G	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	KCNQ2 rectifier K⁺ channel in complex with CaM, apo state

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.