KCNN4

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) Band 19q13.31 Start 43,766,533 bp End 43,780,976 bp
Gene location (Mouse) Chr. Chromosome 7 (mouse) Band 7|7 A3 Start 24,069,688 bp End 24,086,115 bp
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
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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.

Function

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 channel in T-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.

History

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

See also

• SK channel
• Voltage-gated potassium channel
• Senicapoc

Further reading

• 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.