6CNO

Cryo-EM structure of the human SK4/calmodulin channel complex in the Ca2+ bound state II

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Voltage-gated potassium channels	8093290	3000023	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Calmodulin binding domain (CaMBD)-like	8093288	3002034	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Voltage-gated potassium channels	8093290	3000023	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Calmodulin binding domain (CaMBD)-like	8093288	3002034	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Calmodulin binding domain (CaMBD)-like	8093288	3002034	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Voltage-gated potassium channels	8093290	3000023	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Voltage-gated potassium channels	8093290	3000023	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Calmodulin binding domain (CaMBD)-like	8093288	3002034	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	EF-hand	8033438	3001983	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	EF-hand	8033438	3001983	SCOP2B (2022-06-29)
H	SCOP2B Superfamily	EF-hand	8033438	3001983	SCOP2B (2022-06-29)
G	SCOP2B Superfamily	EF-hand	8033438	3001983	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
E	EF-hand_7_8	e6cnoE1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_8	ECOD (1.6)
E	EF-hand_7_5	e6cnoE2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_5	ECOD (1.6)
F	EF-hand_7_8	e6cnoF1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_8	ECOD (1.6)
F	EF-hand_7_5	e6cnoF2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_5	ECOD (1.6)
H	EF-hand_7_8	e6cnoH2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_8	ECOD (1.6)
H	EF-hand_7_5	e6cnoH1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_5	ECOD (1.6)
G	EF-hand_7_8	e6cnoG2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_8	ECOD (1.6)
G	EF-hand_7_5	e6cnoG1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_5	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF02888	Calmodulin binding domain (CaMBD)	Calmodulin binding domain	-	Family
A, B, C, D	PF07885	Ion channel (Ion_trans_2)	Ion channel	-	Family
E, F, G, H	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Intermediate conductance calcium-activated potassium channel protein 4	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 calcium-activated cation 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 calcium-activated cation channel activity gated channel activity monoatomic ion-gated channel activity calcium-activated potassium channel activity ligand-gated channel activity ligand-gated monoatomic ion channel activity intermediate conductance calcium-activated potassium channel activity ligand-gated monoatomic cation channel activity protein phosphatase binding phosphatase binding protein binding binding enzyme binding small conductance calcium-activated potassium channel activity calmodulin binding	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 multicellular organismal process regulation of body fluid levels system process secretion by tissue digestive system process secretion biological regulation body fluid secretion digestion saliva secretion regulation of biological quality regulation of cellular component size homeostatic process cell volume homeostasis cellular component organization cellular homeostasis cellular component organization or biogenesis regulation of cell size regulation of anatomical structure size response to stimulus defense response response to stress cellular localization establishment of localization in cell immune system process cellular response to stimulus positive regulation of cell communication immune response-regulating cell surface receptor signaling pathway regulation of cellular process positive regulation of signal transduction positive regulation of T cell receptor signaling pathway signaling positive regulation of biological process regulation of antigen receptor-mediated signaling pathway regulation of signal transduction cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process positive regulation of cellular process regulation of biological process regulation of signaling cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway immune response regulation of T cell receptor signaling pathway T cell receptor signaling pathway regulation of response to stimulus regulation of immune response regulation of cell communication antigen receptor-mediated signaling pathway activation of immune response positive regulation of antigen receptor-mediated signaling pathway positive regulation of signaling protein localization regulation of localization establishment of protein localization nitrogen compound transport regulation of protein localization positive regulation of establishment of protein localization positive regulation of secretion by cell protein localization to extracellular region positive regulation of protein transport regulation of secretion by cell secretion by cell positive regulation of secretion cellular macromolecule localization regulation of transport organic substance transport regulation of establishment of protein localization establishment of protein localization to extracellular region export from cell regulation of protein transport protein secretion positive regulation of protein secretion regulation of protein secretion regulation of secretion positive regulation of transport protein transport regulation of cellular localization macromolecule localization positive regulation of protein localization stabilization of membrane potential regulation of membrane potential calcium ion transport positive regulation of cation transmembrane transport regulation of potassium ion transport regulation of monoatomic ion transmembrane transport positive regulation of monoatomic ion transport positive regulation of transmembrane transport positive regulation of monoatomic ion transmembrane transport regulation of metal ion transport regulation of monoatomic ion transport regulation of potassium ion transmembrane transport positive regulation of potassium ion transport regulation of transmembrane transport positive regulation of potassium ion transmembrane transport regulation of monoatomic cation transmembrane transport membrane organization phospholipid translocation lipid localization phospholipid transport lipid transport lipid translocation regulation of membrane lipid distribution organophosphate ester transport	membrane-bounded organelle organelle cellular anatomical entity vesicle intracellular anatomical structure cytoplasm cytosol cell periphery plasma membrane membrane voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex potassium channel complex membrane-bounded organelle organelle cellular anatomical entity vesicle intracellular anatomical structure cytoplasm cytosol cell periphery plasma membrane membrane 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 cell projection neuron projection plasma membrane bounded cell projection somatodendritic compartment cell body neuronal cell body
E, F, G, H	Calmodulin-1	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 molecular function inhibitor activity channel regulator activity 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 molecular function inhibitor activity channel regulator activity transporter inhibitor activity calcium channel inhibitor activity ion channel inhibitor activity ion channel regulator activity calcium channel regulator activity transporter regulator activity channel inhibitor activity 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 enzyme binding protein kinase binding calcium-dependent protein binding	organelle localization by membrane tethering localization organelle localization cellular process membrane docking 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 organelle localization by membrane tethering localization organelle localization cellular process membrane docking 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 regulation of nitrogen compound 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 nitrogen compound 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 positive regulation of nitrogen compound metabolic 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 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 cellular component disassembly catabolic process macroautophagy protein-containing complex organization autophagy protein-containing complex disassembly cellular catabolic process cellular component organization autophagosome maturation autophagosome membrane docking cellular component organization or biogenesis process utilizing autophagic mechanism cellular response to stimulus response to interferon-beta response to organic substance response to cytokine cellular response to interferon-beta cellular response to chemical stimulus cellular response to cytokine stimulus cellular response to organic substance 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 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 mitochondrion-endoplasmic reticulum membrane tethering 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 nitrogen compound metabolic process 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 biological process involved in interspecies interaction between organisms response to type II interferon cellular response to type II interferon response to biotic stimulus response to stress innate immune response response to external biotic stimulus immune response response to other organism defense response defense response to symbiont response to external stimulus immune system process defense response to other organism 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 positive regulation of cell communication cell surface receptor signaling pathway via STAT positive regulation of signal transduction positive regulation of receptor signaling pathway via STAT regulation of signal transduction positive regulation of receptor signaling pathway via JAK-STAT positive regulation of response to stimulus regulation of receptor signaling pathway via JAK-STAT regulation of signaling cell surface receptor signaling pathway regulation of response to stimulus regulation of receptor signaling pathway via STAT cell surface receptor signaling pathway via JAK-STAT positive regulation of signaling regulation of intracellular signal transduction 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 cytoplasm cytosol membrane-bounded organelle cell projection intracellular organelle intracellular anatomical structure cytoskeleton spindle organelle intracellular non-membrane-bounded organelle spindle pole cellular anatomical entity microtubule cytoskeleton non-membrane-bounded organelle cytoplasm cytosol membrane-bounded organelle cell projection sperm midpiece cilium 9+2 motile cilium sperm flagellum motile cilium plasma membrane bounded cell projection 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 nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen voltage-gated potassium channel complex plasma membrane protein complex potassium channel complex extracellular region polymeric cytoskeletal fiber spindle microtubule microtubule

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR015449	Potassium channel, calcium-activated, SK	Family
A, B, C, D	IPR013099	Potassium channel domain	Domain
A, B, C, D	IPR036122	SK, calmodulin-binding domain superfamily	Homologous Superfamily
A, B, C, D	IPR004178	Calmodulin-binding domain	Domain
E, F, G, H	IPR002048	EF-hand domain	Domain
E, F, G, H	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
E, F, G, H	IPR011992	EF-hand domain pair	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	Pharos: O15554	dehydrated hereditary stomatocytosis 2 familial hemolytic anemia pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis tinea pedis amyotrophic lateral sclerosis Xerocytosis, hereditary breast carcinoma dermatophytosis of groin and perianal area interstitial lung disease malignant mesothelioma pancreatic intraductal papillary-mucinous carcinoma pityriasis versicolor sinusitis dehydrated hereditary stomatocytosis 2 familial hemolytic anemia pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis tinea pedis amyotrophic lateral sclerosis Xerocytosis, hereditary breast carcinoma dermatophytosis of groin and perianal area interstitial lung disease malignant mesothelioma pancreatic intraductal papillary-mucinous carcinoma pityriasis versicolor sinusitis vulvovaginal candidiasis B-cell chronic lymphocytic leukemia hemolytic anemia lung adenocarcinoma malignant pancreatic neoplasm osteosarcoma pancreatic intraductal papillary-mucinous neoplasm tinea corporis breast cancer estrogen-receptor negative breast cancer interstitial cystitis malignant colon neoplasm oral candidiasis
E, F, G, H	Pharos: P0DP23	long QT syndrome catecholaminergic polymorphic ventricular tachycardia Alzheimer disease long QT syndrome 14 cocaine abuse Weight Gain cannabis dependence cocaine dependence phencyclidine abuse catecholaminergic polymorphic ventricular tachycardia 4 rheumatoid arthritis glioblastoma subependymal giant cell astrocytoma large cell medulloblastoma lung adenocarcinoma long QT syndrome catecholaminergic polymorphic ventricular tachycardia Alzheimer disease long QT syndrome 14 cocaine abuse Weight Gain cannabis dependence cocaine dependence phencyclidine abuse catecholaminergic polymorphic ventricular tachycardia 4 rheumatoid arthritis glioblastoma subependymal giant cell astrocytoma large cell medulloblastoma lung adenocarcinoma malignant colon neoplasm malignant pancreatic neoplasm myopathy astrocytic tumor osteosarcoma pituitary cancer Crohn disease primitive neuroectodermal tumor familial long QT syndrome schizophrenia lung cancer malignant ependymoma nasopharyngeal carcinoma atypical teratoid rhabdoid tumor ovarian cancer catecholaminergic polymorphic ventricular tachycardia 2 Pick disease plasma cell myeloma exocrine pancreatic carcinoma psoriasis sinusitis hepatocellular carcinoma ulcerative colitis lymphoplasmacytic lymphoma malignant glioma medulloblastoma amyotrophic lateral sclerosis oligodendroglioma breast cancer pilocytic astrocytoma

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	Calcium-activated SK potassium 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	small-conductance Ca²⁺-activated K⁺ (SK) channel calmodulin complex, Ca- bound state I

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.