ATP-sensitive inward rectifier potassium channel 1

NameATP-sensitive inward rectifier potassium channel 1
Synonyms
  • ATP-regulated potassium channel ROM-K
  • Inward rectifier K(+) channel Kir1.1
  • Potassium channel, inwardly rectifying subfamily J member 1
  • ROMK1
Gene NameKCNJ1
OrganismHuman
Amino acid sequence
>lcl|BSEQ0001284|ATP-sensitive inward rectifier potassium channel 1
MNASSRNVFDTLIRVLTESMFKHLRKWVVTRFFGHSRQRARLVSKDGRCNIEFGNVEAQS
RFIFFVDIWTTVLDLKWRYKMTIFITAFLGSWFFFGLLWYAVAYIHKDLPEFHPSANHTP
CVENINGLTSAFLFSLETQVTIGYGFRCVTEQCATAIFLLIFQSILGVIINSFMCGAILA
KISRPKKRAKTITFSKNAVISKRGGKLCLLIRVANLRKSLLIGSHIYGKLLKTTVTPEGE
TIILDQININFVVDAGNENLFFISPLTIYHVIDHNSPFFHMAAETLLQQDFELVVFLDGT
VESTSATCQVRTSYVPEEVLWGYRFAPIVSKTKEGKYRVDFHNFSKTVEVETPHCAMCLY
NEKDVRARMKRGYDNPNFILSEVNETDDTKM
Number of residues391
Molecular Weight44794.6
Theoretical pI9.04
GO Classification
Functions
  • phosphatidylinositol-4,5-bisphosphate binding
  • ATP binding
  • inward rectifier potassium channel activity
  • ATP-activated inward rectifier potassium channel activity
Processes
  • potassium ion import
  • tissue homeostasis
  • excretion
  • cardiovascular system development
  • regulation of G-protein activated inward rectifier potassium channel activity
  • regulation of ion transmembrane transport
  • potassium ion transport
  • renal sodium ion absorption
  • synaptic transmission
  • post-embryonic development
  • kidney development
Components
  • plasma membrane
  • voltage-gated potassium channel complex
  • integral component of plasma membrane
General FunctionPhosphatidylinositol-4,5-bisphosphate binding
Specific FunctionIn the kidney, probably plays a major role in potassium homeostasis. Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. Their voltage dependence is regulated by the concentration of extracellular potassium; as external potassium is raised, the voltage range of the channel opening shifts to more positive voltages. The inward rectification is mainly due to the blockage of outward current by internal magnesium. This channel is activated by internal ATP and can be blocked by external barium.
Pfam Domain Function
Transmembrane Regions78-102 156-177
GenBank Protein ID529313
UniProtKB IDP48048
UniProtKB Entry NameKCNJ1_HUMAN
Cellular LocationCell membrane
Gene sequence
>lcl|BSEQ0010449|ATP-sensitive inward rectifier potassium channel 1 (KCNJ1)
ATGAATGCTTCCAGTCGGAATGTGTTTGACACGTTGATCAGGGTGTTGACAGAAAGTATG
TTCAAACATCTTCGGAAATGGGTCGTCACTCGCTTTTTTGGGCATTCTCGGCAAAGAGCA
AGGCTAGTCTCCAAAGATGGAAGGTGCAACATAGAATTTGGCAATGTGGAGGCACAGTCA
AGGTTTATATTCTTTGTGGACATCTGGACAACGGTACTTGACCTCAAGTGGAGATACAAA
ATGACCATTTTCATCACAGCCTTCTTGGGGAGTTGGTTTTTCTTTGGTCTCCTGTGGTAT
GCAGTAGCGTACATTCACAAAGACCTCCCGGAATTCCATCCTTCTGCCAATCACACTCCC
TGTGTGGAGAATATTAATGGCTTGACCTCAGCTTTTCTGTTTTCTCTGGAGACTCAAGTG
ACCATTGGATATGGATTCAGGTGTGTGACAGAACAGTGTGCCACTGCCATTTTTCTGCTT
ATCTTTCAGTCTATACTTGGAGTTATAATCAATTCTTTCATGTGTGGGGCCATCTTAGCC
AAGATCTCCAGGCCCAAAAAACGTGCCAAGACCATTACGTTCAGCAAGAACGCAGTGATC
AGCAAACGGGGAGGGAAGCTTTGCCTCCTAATCCGAGTGGCTAATCTCAGGAAGAGCCTT
CTTATTGGCAGTCACATTTATGGAAAGCTTCTGAAGACCACAGTCACTCCTGAAGGAGAG
ACCATTATTTTGGACCAGATCAATATCAACTTTGTAGTTGACGCTGGGAATGAAAATTTA
TTCTTCATCTCCCCATTGACAATTTACCATGTCATTGATCACAACAGCCCTTTCTTCCAC
ATGGCAGCGGAGACCCTTCTCCAGCAGGACTTTGAATTAGTGGTGTTTTTAGATGGCACA
GTGGAGTCCACCAGTGCTACCTGCCAAGTCCGGACATCCTATGTCCCAGAGGAGGTGCTT
TGGGGCTACCGTTTTGCTCCCATAGTATCCAAGACAAAGGAAGGGAAATACCGAGTGGAT
TTCCATAACTTTAGCAAGACAGTGGAAGTGGAGACCCCTCACTGTGCCATGTGCCTTTAT
AATGAGAAAGATGTTAGAGCCAGGATGAAGAGAGGCTATGACAACCCCAACTTCATCTTG
TCAGAAGTCAATGAAACAGATGACACCAAAATGTAA
GenBank Gene IDU12541
GeneCard IDNot Available
GenAtlas IDKCNJ1
HGNC IDHGNC:6255
Chromosome Location11
Locus11q24
References
  1. Shuck ME, Bock JH, Benjamin CW, Tsai TD, Lee KS, Slightom JL, Bienkowski MJ: Cloning and characterization of multiple forms of the human kidney ROM-K potassium channel. J Biol Chem. 1994 Sep 30;269(39):24261-70. 7929082
  2. Yano H, Philipson LH, Kugler JL, Tokuyama Y, Davis EM, Le Beau MM, Nelson DJ, Bell GI, Takeda J: Alternative splicing of human inwardly rectifying K+ channel ROMK1 mRNA. Mol Pharmacol. 1994 May;45(5):854-60. 8190102
  3. Bock JH, Shuck ME, Benjamin CW, Chee M, Bienkowski MJ, Slightom JL: Nucleotide sequence analysis of the human KCNJ1 potassium channel locus. Gene. 1997 Mar 25;188(1):9-16. 9099852
  4. Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. 15489334
  5. Krishnan SN, Desai T, Ward DC, Haddad GG: Isolation and chromosomal localization of a human ATP-regulated potassium channel. Hum Genet. 1995 Aug;96(2):155-60. 7635463
  6. Pabon A, Chan KW, Sui JL, Wu X, Logothetis DE, Thornhill WB: Glycosylation of GIRK1 at Asn119 and ROMK1 at Asn117 has different consequences in potassium channel function. J Biol Chem. 2000 Sep 29;275(39):30677-82. 10889209
  7. Palmada M, Embark HM, Yun C, Bohmer C, Lang F: Molecular requirements for the regulation of the renal outer medullary K(+) channel ROMK1 by the serum- and glucocorticoid-inducible kinase SGK1. Biochem Biophys Res Commun. 2003 Nov 21;311(3):629-34. 14623317
  8. Yoo D, Kim BY, Campo C, Nance L, King A, Maouyo D, Welling PA: Cell surface expression of the ROMK (Kir 1.1) channel is regulated by the aldosterone-induced kinase, SGK-1, and protein kinase A. J Biol Chem. 2003 Jun 20;278(25):23066-75. Epub 2003 Apr 8. 12684516
  9. Leng Q, Kahle KT, Rinehart J, MacGregor GG, Wilson FH, Canessa CM, Lifton RP, Hebert SC: WNK3, a kinase related to genes mutated in hereditary hypertension with hyperkalaemia, regulates the K+ channel ROMK1 (Kir1.1). J Physiol. 2006 Mar 1;571(Pt 2):275-86. Epub 2005 Dec 15. 16357011
  10. Simon DB, Karet FE, Rodriguez-Soriano J, Hamdan JH, DiPietro A, Trachtman H, Sanjad SA, Lifton RP: Genetic heterogeneity of Bartter's syndrome revealed by mutations in the K+ channel, ROMK. Nat Genet. 1996 Oct;14(2):152-6. 8841184
  11. Authors unspecified: Mutations in the gene encoding the inwardly-rectifying renal potassium channel, ROMK, cause the antenatal variant of Bartter syndrome: evidence for genetic heterogeneity. International Collaborative Study Group for Bartter-like Syndromes. Hum Mol Genet. 1997 Jan;6(1):17-26. 9002665
  12. Derst C, Wischmeyer E, Preisig-Muller R, Spauschus A, Konrad M, Hensen P, Jeck N, Seyberth HW, Daut J, Karschin A: A hyperprostaglandin E syndrome mutation in Kir1.1 (renal outer medullary potassium) channels reveals a crucial residue for channel function in Kir1.3 channels. J Biol Chem. 1998 Sep 11;273(37):23884-91. 9727001
  13. Sjoblom T, Jones S, Wood LD, Parsons DW, Lin J, Barber TD, Mandelker D, Leary RJ, Ptak J, Silliman N, Szabo S, Buckhaults P, Farrell C, Meeh P, Markowitz SD, Willis J, Dawson D, Willson JK, Gazdar AF, Hartigan J, Wu L, Liu C, Parmigiani G, Park BH, Bachman KE, Papadopoulos N, Vogelstein B, Kinzler KW, Velculescu VE: The consensus coding sequences of human breast and colorectal cancers. Science. 2006 Oct 13;314(5797):268-74. Epub 2006 Sep 7. 16959974