Hmdb loader

Showing Protein Inward rectifier potassium channel 2 (HMDBP02418)

IdentificationBiological propertiesGene propertiesProtein propertiesExternal linksReferencesXMLShow 2 metabolites
Identification
HMDB Protein ID HMDBP02418
Secondary Accession Numbers
  • 7912
Name Inward rectifier potassium channel 2
Synonyms
  1. Cardiac inward rectifier potassium channel
  2. IRK-1
  3. Inward rectifier K(+) channel Kir2.1
  4. Potassium channel, inwardly rectifying subfamily J member 2
  5. hIRK1
Gene Name KCNJ2
Protein Type Unknown
Biological Properties
General Function Involved in inward rectifier potassium channel activity
Specific Function Probably participates in establishing action potential waveform and excitability of neuronal and muscle tissues. 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. Can be blocked by extracellular barium or cesium
Pathways
  • Acebutolol Action Pathway
  • Alprenolol Action Pathway
  • Amiodarone Action Pathway
  • Amlodipine Action Pathway
  • Arbutamine Action Pathway
  • Atenolol Action Pathway
  • Betaxolol Action Pathway
  • Bevantolol Action Pathway
  • Bisoprolol Action Pathway
  • Bopindolol Action Pathway
  • Bupranolol Action Pathway
  • Carteolol Action Pathway
  • Carvedilol Action Pathway
  • Diltiazem Action Pathway
  • Disopyramide Action Pathway
  • Dobutamine Action Pathway
  • Epinephrine Action Pathway
  • Esmolol Action Pathway
  • Felodipine Action Pathway
  • Flecainide Action Pathway
  • Fosphenytoin (Antiarrhythmic) Action Pathway
  • Ibutilide Action Pathway
  • Isoprenaline Action Pathway
  • Isradipine Action Pathway
  • Labetalol Action Pathway
  • Levobunolol Action Pathway
  • Lidocaine (Antiarrhythmic) Action Pathway
  • Metipranolol Action Pathway
  • Metoprolol Action Pathway
  • Mexiletine Action Pathway
  • Muscle/Heart Contraction
  • Nadolol Action Pathway
  • Nebivolol Action Pathway
  • Nifedipine Action Pathway
  • Nimodipine Action Pathway
  • Nisoldipine Action Pathway
  • Nitrendipine Action Pathway
  • Oxprenolol Action Pathway
  • Penbutolol Action Pathway
  • Phenytoin (Antiarrhythmic) Action Pathway
  • Pindolol Action Pathway
  • Practolol Action Pathway
  • Procainamide (Antiarrhythmic) Action Pathway
  • Propranolol Action Pathway
  • Quinidine Action Pathway
  • Sotalol Action Pathway
  • Timolol Action Pathway
  • Tocainide Action Pathway
  • Verapamil Action Pathway
Reactions Not Available
GO Classification
Component
membrane
cell part
Function
transmembrane transporter activity
substrate-specific transmembrane transporter activity
ion transmembrane transporter activity
transporter activity
ion channel activity
inward rectifier potassium channel activity
cation channel activity
potassium channel activity
voltage-gated potassium channel activity
Process
establishment of localization
transport
monovalent inorganic cation transport
potassium ion transport
ion transport
cation transport
Cellular Location
  1. Membrane
  2. Multi-pass membrane protein
Gene Properties
Chromosome Location Chromosome:1
Locus 17q24.3
SNPs KCNJ2
Gene Sequence 
>1284 bp
ATGGGCAGTGTGCGAACCAACCGCTACAGCATCGTTTCTTCAGAAGAAGACGGTATGAAG
TTGGCCACCATGGCAGTTGCAAATGGCTTTGGGAACGGGAAGAGTAAAGTCCACACCCGA
CAACAGTGCAGGAGCCGCTTTGTGAAGAAAGATGGCCACTGTAATGTTCAGTTCATCAAT
GTGGGTGAGAAGGGGCAACGGTACCTCGCAGACATCTTCACCACGTGTGTGGACATTCGC
TGGCGGTGGATGCTGGTTATTTTCTGCCTGGCTTTCGTCCTGTCATGGCTGTTTTTTGGC
TGTGTGTTTTGGTTGATAGCTCTGCTCCATGGGGACCTGGATGCATCCAAAGAGGGCAAA
GCTTGTGTGTCCGAGGTCAACAGCTTCACGGCTGCCTTCCTCTTCTCCATTGAGACCCAG
ACAACCATAGGCTATGGTTTCAGATGTGTCACGGATGAATGCCCAATTGCTGTTTTCATG
GTGGTGTTCCAGTCAATCGTGGGCTGCATCATCGATGCTTTCATCATTGGCGCAGTCATG
GCCAAGATGGCAAAGCCAAAGAAGAGAAACGAGACTCTTGTCTTCAGTCACAATGCCGTG
ATTGCCATGAGAGACGGCAAGCTGTGTTTGATGTGGCGAGTGGGCAATCTTCGGAAAAGC
CACTTGGTGGAAGCTCATGTTCGAGCACAGCTCCTCAAATCCAGAATTACTTCTGAAGGG
GAGTATATCCCTCTGGATCAAATAGACATCAATGTTGGGTTTGACAGTGGAATCGATCGT
ATATTTCTGGTGTCCCCAATCACTATAGTCCATGAAATAGATGAAGACAGTCCTTTATAT
GATTTGAGTAAACAGGACATTGACAACGCAGACTTTGAAATCGTGGTCATACTGGAAGGC
ATGGTGGAAGCCACTGCCATGACGACACAGTGCCGTAGCTCTTATCTAGCAAATGAAATC
CTGTGGGGCCACCGCTATGAGCCTGTGCTCTTTGAAGAGAAGCACTACTACAAAGTGGAC
TATTCCAGGTTCCACAAAACTTACGAAGTCCCCAACACTCCCCTTTGTAGTGCCAGAGAC
TTAGCAGAAAAGAAATATATCCTCTCAAATGCAAATTCATTTTGCTATGAAAATGAAGTT
GCCCTCACAAGCAAAGAGGAAGACGACAGTGAAAATGGAGTTCCAGAAAGCACTAGTACG
GACACGCCCCCTGACATAGACCTTCACAACCAGGCAAGTGTACCTCTAGAGCCCAGGCCC
TTACGGCGAGAGTCGGAGATATGA
Protein Properties
Number of Residues 427
Molecular Weight 48287.8
Theoretical pI 5.47
Pfam Domain Function
Signals
  • None
Transmembrane Regions
  • 82-106
  • 157-178
Protein Sequence 
>Inward rectifier potassium channel 2
MGSVRTNRYSIVSSEEDGMKLATMAVANGFGNGKSKVHTRQQCRSRFVKKDGHCNVQFIN
VGEKGQRYLADIFTTCVDIRWRWMLVIFCLAFVLSWLFFGCVFWLIALLHGDLDASKEGK
ACVSEVNSFTAAFLFSIETQTTIGYGFRCVTDECPIAVFMVVFQSIVGCIIDAFIIGAVM
AKMAKPKKRNETLVFSHNAVIAMRDGKLCLMWRVGNLRKSHLVEAHVRAQLLKSRITSEG
EYIPLDQIDINVGFDSGIDRIFLVSPITIVHEIDEDSPLYDLSKQDIDNADFEIVVILEG
MVEATAMTTQCRSSYLANEILWGHRYEPVLFEEKHYYKVDYSRFHKTYEVPNTPLCSARD
LAEKKYILSNANSFCYENEVALTSKEEDDSENGVPESTSTDTPPDIDLHNQASVPLEPRP
LRRESEI
GenBank ID Protein Not Available
UniProtKB/Swiss-Prot ID P63252
UniProtKB/Swiss-Prot Entry Name IRK2_HUMAN
PDB IDs
GenBank Gene ID U24055
GeneCard ID KCNJ2
GenAtlas ID KCNJ2
HGNC ID HGNC:6263
References
General References
  1. Rikova K, Guo A, Zeng Q, Possemato A, Yu J, Haack H, Nardone J, Lee K, Reeves C, Li Y, Hu Y, Tan Z, Stokes M, Sullivan L, Mitchell J, Wetzel R, Macneill J, Ren JM, Yuan J, Bakalarski CE, Villen J, Kornhauser JM, Smith B, Li D, Zhou X, Gygi SP, Gu TL, Polakiewicz RD, Rush J, Comb MJ: Global survey of phosphotyrosine signaling identifies oncogenic kinases in lung cancer. Cell. 2007 Dec 14;131(6):1190-203. [PubMed:18083107 ]
  2. Raab-Graham KF, Radeke CM, Vandenberg CA: Molecular cloning and expression of a human heart inward rectifier potassium channel. Neuroreport. 1994 Dec 20;5(18):2501-5. [PubMed:7696590 ]
  3. Wood LS, Tsai TD, Lee KS, Vogeli G: Cloning and functional expression of a human gene, hIRK1, encoding the heart inward rectifier K+-channel. Gene. 1995 Oct 3;163(2):313-7. [PubMed:7590287 ]
  4. Tare M, Prestwich SA, Gordienko DV, Parveen S, Carver JE, Robinson C, Bolton TB: Inwardly rectifying whole cell potassium current in human blood eosinophils. J Physiol. 1998 Jan 15;506 ( Pt 2):303-18. [PubMed:9490857 ]
  5. Derst C, Karschin C, Wischmeyer E, Hirsch JR, Preisig-Muller R, Rajan S, Engel H, Grzeschik K, Daut J, Karschin A: Genetic and functional linkage of Kir5.1 and Kir2.1 channel subunits. FEBS Lett. 2001 Mar 2;491(3):305-11. [PubMed:11240146 ]
  6. Ashen MD, O'Rourke B, Kluge KA, Johns DC, Tomaselli GF: Inward rectifier K+ channel from human heart and brain: cloning and stable expression in a human cell line. Am J Physiol. 1995 Jan;268(1 Pt 2):H506-11. [PubMed:7840300 ]
  7. Plaster NM, Tawil R, Tristani-Firouzi M, Canun S, Bendahhou S, Tsunoda A, Donaldson MR, Iannaccone ST, Brunt E, Barohn R, Clark J, Deymeer F, George AL Jr, Fish FA, Hahn A, Nitu A, Ozdemir C, Serdaroglu P, Subramony SH, Wolfe G, Fu YH, Ptacek LJ: Mutations in Kir2.1 cause the developmental and episodic electrical phenotypes of Andersen's syndrome. Cell. 2001 May 18;105(4):511-9. [PubMed:11371347 ]
  8. Andelfinger G, Tapper AR, Welch RC, Vanoye CG, George AL Jr, Benson DW: KCNJ2 mutation results in Andersen syndrome with sex-specific cardiac and skeletal muscle phenotypes. Am J Hum Genet. 2002 Sep;71(3):663-8. Epub 2002 Jul 29. [PubMed:12148092 ]
  9. Tristani-Firouzi M, Jensen JL, Donaldson MR, Sansone V, Meola G, Hahn A, Bendahhou S, Kwiecinski H, Fidzianska A, Plaster N, Fu YH, Ptacek LJ, Tawil R: Functional and clinical characterization of KCNJ2 mutations associated with LQT7 (Andersen syndrome). J Clin Invest. 2002 Aug;110(3):381-8. [PubMed:12163457 ]
  10. Priori SG, Pandit SV, Rivolta I, Berenfeld O, Ronchetti E, Dhamoon A, Napolitano C, Anumonwo J, di Barletta MR, Gudapakkam S, Bosi G, Stramba-Badiale M, Jalife J: A novel form of short QT syndrome (SQT3) is caused by a mutation in the KCNJ2 gene. Circ Res. 2005 Apr 15;96(7):800-7. Epub 2005 Mar 10. [PubMed:15761194 ]