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(Top) 1 Function 2 History 3 See also 4 References 5 Further reading

KCNN4

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KCNN4

Identifiers

Aliases

KCNN4, IK1, IKCA1, KCA4, KCa3.1, SK4, hIKCa1, hKCa4, hSK4, IK, DHS2, potassium calcium-activated channel subfamily N member 4

External IDs

OMIM: 602754; MGI: 1277957; HomoloGene: 1696; GeneCards: KCNN4; OMA:KCNN4 - orthologs

Gene location (Human)

Chr.	Chromosome 19 (human)^[1]

Band	19q13.31	Start	43,766,533 bp^[1]
Band	19q13.31	End	43,780,976 bp^[1]

Gene location (Mouse)

Chr.	Chromosome 7 (mouse)^[2]

Band	7\|7 A3	Start	24,069,688 bp^[2]
Band	7\|7 A3	End	24,086,115 bp^[2]

RNA expression pattern

Bgee

Human

Mouse (ortholog)

Top expressed in

olfactory zone of nasal mucosa

parotid gland

minor salivary glands

mucosa of transverse colon

granulocyte

skin of leg

trachea

skin of abdomen

placenta

lymph node

Top expressed in

parotid gland

Paneth cell

lacrimal gland

submandibular gland

fetal liver hematopoietic progenitor cell

crypt of lieberkuhn of small intestine

lumbar spinal ganglion

thymus

transitional epithelium of urinary bladder

lymph node

More reference expression data

BioGPS


More reference expression data

Gene ontology
Molecular function	protein binding protein phosphatase binding calcium-activated potassium channel activity potassium channel activity calmodulin binding small conductance calcium-activated potassium channel activity Intermediate conductance calcium-activated potassium channel activity
Cellular component	integral component of membrane membrane voltage-gated potassium channel complex plasma membrane vesicle neuronal cell body neuron projection
Biological process	calcium ion transport positive regulation of protein secretion cell volume homeostasis potassium ion transport saliva secretion ion transport positive regulation of T cell receptor signaling pathway immune system process defense response phospholipid translocation stabilization of membrane potential potassium ion transmembrane transport
Sources:Amigo / QuickGO

Orthologs

Species

Human

Mouse

Entrez


3783


16534

Ensembl


ENSG00000104783


ENSMUSG00000054342

UniProt


O15554


O89109

RefSeq (mRNA)


NM_002250


NM_001163510 NM_008433

RefSeq (protein)


NP_002241


NP_001156982 NP_032459

Location (UCSC)

Chr 19: 43.77 – 43.78 Mb

Chr 7: 24.07 – 24.09 Mb

PubMed search

^[3]

^[4]

Wikidata

View/Edit Human

View/Edit Mouse

Potassium intermediate/small conductance calcium-activated channel, subfamily N, member 4, also known as KCNN4, is a human gene encoding the K_Ca3.1 protein.^[5]

Function[edit]

The K_Ca3.1 protein is part of a potentially heterotetrameric voltage-independent potassium channel that is activated by intracellular calcium. Activation is followed by membrane hyperpolarization, which promotes calcium influx. The encoded protein may be part of the predominant calcium-activated potassium channelinT-lymphocytes. This gene is similar to other KCNN family potassium channel genes, but it differs enough to possibly be considered as part of a new subfamily.^[5]

History[edit]

The channel activity was first described in 1958 by György Gárdos in human erythrocytes.^[6] The channel is also named Gardos channel because of its discoverer.

References[edit]

^ ^a ^b ^c GRCh38: Ensembl release 89: ENSG00000104783 – Ensembl, May 2017

^ ^a ^b ^c GRCm38: Ensembl release 89: ENSMUSG00000054342 – Ensembl, May 2017

^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.

^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.

^ ^a ^b "Entrez Gene: KCNN4 potassium intermediate/small conductance calcium-activated channel, subfamily N, member 4".

^ Gardos G (1958). "The function of calcium in the potassium permeability of human erythrocytes". Biochim. Biophys. Acta. 30 (3): 653–4. doi:10.1016/0006-3002(58)90124-0. PMID 13618284.

Further reading[edit]

Wei AD, Gutman GA, Aldrich R, Chandy KG, Grissmer S, Wulff H (2005). "International Union of Pharmacology. LII. Nomenclature and molecular relationships of calcium-activated potassium channels". Pharmacol. Rev. 57 (4): 463–72. doi:10.1124/pr.57.4.9. PMID 16382103. S2CID 8290401.

Ishii TM, Silvia C, Hirschberg B, Bond CT, Adelman JP, Maylie J (1997). "A human intermediate conductance calcium-activated potassium channel". Proc. Natl. Acad. Sci. U.S.A. 94 (21): 11651–6. Bibcode:1997PNAS...9411651I. doi:10.1073/pnas.94.21.11651. PMC 23567. PMID 9326665.

Joiner WJ, Wang LY, Tang MD, Kaczmarek LK (1997). "hSK4, a member of a novel subfamily of calcium-activated potassium channels". Proc. Natl. Acad. Sci. U.S.A. 94 (20): 11013–8. Bibcode:1997PNAS...9411013J. doi:10.1073/pnas.94.20.11013. PMC 23566. PMID 9380751.

Logsdon NJ, Kang J, Togo JA, Christian EP, Aiyar J (1997). "A novel gene, hKCa4, encodes the calcium-activated potassium channel in human T lymphocytes". J. Biol. Chem. 272 (52): 32723–6. doi:10.1074/jbc.272.52.32723. PMID 9407042.

Ghanshani S, Coleman M, Gustavsson P, Wu AC, Gargus JJ, Gutman GA, Dahl N, Mohrenweiser H, Chandy KG (1998). "Human calcium-activated potassium channel gene KCNN4 maps to chromosome 19q13.2 in the region deleted in diamond-blackfan anemia". Genomics. 51 (1): 160–1. doi:10.1006/geno.1998.5333. PMID 9693050.

Fanger CM, Ghanshani S, Logsdon NJ, Rauer H, Kalman K, Zhou J, Beckingham K, Chandy KG, Cahalan MD, Aiyar J (1999). "Calmodulin mediates calcium-dependent activation of the intermediate conductance KCa channel, IKCa1". J. Biol. Chem. 274 (9): 5746–54. doi:10.1074/jbc.274.9.5746. PMID 10026195.

Liu QH, Williams DA, McManus C, Baribaud F, Doms RW, Schols D, De Clercq E, Kotlikoff MI, Collman RG, Freedman BD (2000). "HIV-1 gp120 and chemokines activate ion channels in primary macrophages through CCR5 and CXCR4 stimulation". Proc. Natl. Acad. Sci. U.S.A. 97 (9): 4832–7. Bibcode:2000PNAS...97.4832L. doi:10.1073/pnas.090521697. PMC 18318. PMID 10758170.

Ghanshani S, Wulff H, Miller MJ, Rohm H, Neben A, Gutman GA, Cahalan MD, Chandy KG (2000). "Up-regulation of the IKCa1 potassium channel during T-cell activation. Molecular mechanism and functional consequences". J. Biol. Chem. 275 (47): 37137–49. doi:10.1074/jbc.M003941200. PMID 10961988.

Wulff H, Miller MJ, Hansel W, Grissmer S, Cahalan MD, Chandy KG (2000). "Design of a potent and selective inhibitor of the intermediate-conductance Ca2+-activated K+ channel, IKCa1: a potential immunosuppressant". Proc. Natl. Acad. Sci. U.S.A. 97 (14): 8151–6. Bibcode:2000PNAS...97.8151W. doi:10.1073/pnas.97.14.8151. PMC 16685. PMID 10884437.

Wulff H, Gutman GA, Cahalan MD, Chandy KG (2001). "Delineation of the clotrimazole/TRAM-34 binding site on the intermediate conductance calcium-activated potassium channel, IKCa1". J. Biol. Chem. 276 (34): 32040–5. doi:10.1074/jbc.M105231200. PMID 11425865.

Koegel H, Kaesler S, Burgstahler R, Werner S, Alzheimer C (2003). "Unexpected down-regulation of the hIK1 Ca2+-activated K+ channel by its opener 1-ethyl-2-benzimidazolinone in HaCaT keratinocytes. Inverse effects on cell growth and proliferation". J. Biol. Chem. 278 (5): 3323–30. doi:10.1074/jbc.M208914200. PMID 12421833.

Mazzone JN, Kaiser RA, Buxton IL (2002). "Calcium-activated potassium channel expression in human myometrium: effect of pregnancy". Proc. West. Pharmacol. Soc. 45: 184–6. PMID 12434576.

Syme CA, Hamilton KL, Jones HM, Gerlach AC, Giltinan L, Papworth GD, Watkins SC, Bradbury NA, Devor DC (2003). "Trafficking of the Ca2+-activated K+ channel, hIK1, is dependent upon a C-terminal leucine zipper". J. Biol. Chem. 278 (10): 8476–86. doi:10.1074/jbc.M210072200. PMID 12493744.

Hamilton KL, Syme CA, Devor DC (2003). "Molecular localization of the inhibitory arachidonic acid binding site to the pore of hIK1". J. Biol. Chem. 278 (19): 16690–7. doi:10.1074/jbc.M212959200. PMID 12609997.

Mall M, Gonska T, Thomas J, Schreiber R, Seydewitz HH, Kuehr J, Brandis M, Kunzelmann K (2003). "Modulation of Ca2+-activated Cl- secretion by basolateral K+ channels in human normal and cystic fibrosis airway epithelia". Pediatr. Res. 53 (4): 608–18. doi:10.1203/01.PDR.0000057204.51420.DC. PMID 12612194.

Hoffman JF, Joiner W, Nehrke K, Potapova O, Foye K, Wickrema A (2003). "The hSK4 (KCNN4) isoform is the Ca2+-activated K+ channel (Gardos channel) in human red blood cells". Proc. Natl. Acad. Sci. U.S.A. 100 (12): 7366–71. Bibcode:2003PNAS..100.7366H. doi:10.1073/pnas.1232342100. PMC 165881. PMID 12773623.

Bernard K, Bogliolo S, Soriani O, Ehrenfeld J (2003). "Modulation of calcium-dependent chloride secretion by basolateral SK4-like channels in a human bronchial cell line". J. Membr. Biol. 196 (1): 15–31. doi:10.1007/s00232-003-0621-3. PMID 14724753. S2CID 20530729.

Köhler R, Wulff H, Eichler I, Kneifel M, Neumann D, Knorr A, Grgic I, Kämpfe D, Si H, Wibawa J, Real R, Borner K, Brakemeier S, Orzechowski HD, Reusch HP, Paul M, Chandy KG, Hoyer J (2003). "Blockade of the intermediate-conductance calcium-activated potassium channel as a new therapeutic strategy for restenosis". Circulation. 108 (9): 1119–25. doi:10.1161/01.CIR.0000086464.04719.DD. PMID 12939222.

Toyama K, Wulff H, Chandy KG, Azam P, Raman G, Saito T, Fujiwara Y, Mattson DL, Das S, Melvin JE, Pratt PF, Hatoum OA, Gutterman DD, Harder DR, Miura H (2008). "The intermediate-conductance calcium-activated potassium channel KCa3.1 contributes to atherogenesis in mice and humans". J. Clin. Invest. 118 (9): 3025–37. doi:10.1172/JCI30836. PMC 2496961. PMID 18688283.

Jones HM, Hamilton KL, Papworth GD, Syme CA, Watkins SC, Bradbury NA, Devor DC (2004). "Role of the NH2 terminus in the assembly and trafficking of the intermediate conductance Ca2+-activated K+ channel hIK1". J. Biol. Chem. 279 (15): 15531–40. doi:10.1074/jbc.M400069200. PMID 14754884.

Gibson JS, Muzyamba MC (2004). "Modulation of Gardos channel activity by oxidants and oxygen tension: effects of 1-chloro-2,4-dinitrobenzene and phenazine methosulphate". Bioelectrochemistry. 62 (2): 147–52. doi:10.1016/j.bioelechem.2003.07.008. PMID 15039018.

Lew VL, Tiffert T, Etzion Z, Perdomo D, Daw N, Macdonald L, Bookchin RM (2005). "Distribution of dehydration rates generated by maximal Gardos-channel activation in normal and sickle red blood cells". Blood. 105 (1): 361–7. doi:10.1182/blood-2004-01-0125. PMID 15339840.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Membrane transport protein: ion channels (TC 1A)

Ca²⁺: Calcium channel

Ligand-gated

Inositol trisphosphate receptor
- 1
- 2
- 3
Ryanodine receptor
- 1
- 2
- 3

Voltage-gated

L-type/Ca_vα
- 1.1
- 1.2
- 1.3
- 1.4
N-type/Ca_vα2.2
P-type/Ca_vα
- 2.1
Q-type/Ca_vα2.1
R-type/Ca_vα2.3
T-type/Ca_vα
- 3.1
- 3.2
- 3.3

α₂δ-subunits
- 1
- 2
β-subunits
- β1
- β2
- β3
- β4
γ-subunits
- γ1
- γ2
- γ3
- γ4

Cation channels of sperm
- 1
- 2
- 3
- 4
Two-pore channel
- 1
- 2

Na⁺: Sodium channel

Constitutively active

Epithelial sodium channel
- α
- β
- γ
- δ

Proton-gated

Amiloride-sensitive cation channel
- 1
- 2
- 3
- 4

Voltage-gated

Na_vα
- 1.1
- 1.2
- 1.3
- 1.4
- 1.5
- 1.6
- 1.7
- 1.8
- 1.9
- 7A
Na_vβ
- 1
- 2
- 3
- 4

K⁺: Potassium channel

Calcium-activated	BK channel α1 β1 β2 β3 β4 SK channel SK1 SK2 SK3 IK channel IK1 K_Ca 1.1 2.1 2.2 2.3 3.1 4.1 4.2 5.1
Inward-rectifier	K_ATP K_ir 1.1 2.1 2.2 2.3 2.4 2.6 GIRK/K_ir 3.1 3.2 3.3 3.4 K_ir 4.1 4.2 5.1 6.1 6.2 7.1
Tandem pore domain	K2P 1 2 3 4 5 6 7 9 10 12 13 15 16 17 18
Voltage-gated	K_vα1-6 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 2.1 2.2 3.1 3.2 3.3 3.4 4.1 4.2 4.3 5.1 6.1 6.2 6.3 6.4 K_vα7-12 7.1 7.2 7.3 7.4 7.5 8.1 8.2 9.1 9.2 9.3 10.1 10.2 11.1/hERG 11.2 11.3 12.1 12.2 12.3 K_vβ 1 2 3 KCNIP 1 2 3 4 minK/ISK minK/ISK-like MiRP 1 2 3 Shaker (gene)

Miscellaneous

Cl⁻: Chloride channel	Calcium-activated chloride channels Anoctamin ANO1 Bestrophin 1 2 Chloride Channel Accessory 1 2 3 4 CFTR CLCN 1 2 3 4 5 6 7 KA KB CLIC 1 2 3 4 5 6 L1 CLNS 1A 1B
H⁺: Proton channel	HVCN1
M⁺: CNG cation channel	α 1 2 3 4 β 1 2 3 HCN FC 1 2 3 4
M⁺: TRP cation channel	TRPA (1) TRPC 1 2 3 4 4AP 5 6 7 TRPM 1 2 3 4 5 6 7 8 TRPML 1 2 3 TRPN TRPP 1 2 TRPV 1 2 3 4 5 6
H₂O (+ solutes): Porin	Aquaporin 0 1 2 3 4 5 6 7 8 9 Voltage-dependent anion channel 1 2 3 General bacterial porin family
Cytoplasm: Gap junction	Connexin A GJA1 GJA3 GJA4 GJA5 GJA8 GJA9 GJA10 B GJB1 GJB2 GJB3 GJB4 GJB5 GJB6 GJB7 C GJC1 GJC2 GJC3 D GJD2 GJD3 GJD4 Innexin

By gating mechanism

Ion channel class

see also disorders

This membrane protein–related article is a stub. You can help Wikipedia by expanding it.

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