KCNJ15

KCNJ15
Identifiers
Aliases KCNJ15, IRKK, KIR1.3, KIR4.2, potassium voltage-gated channel subfamily J member 15
External IDs MGI: 1310000 HomoloGene: 1690 GeneCards: KCNJ15
RNA expression pattern


More reference expression data
Orthologs
Species Human Mouse
Entrez

3772

16516

Ensembl

ENSG00000157551

ENSMUSG00000062609

UniProt

Q99712

O88932

RefSeq (mRNA)
RefSeq (protein)
Location (UCSC) Chr 21: 38.16 – 38.31 Mb Chr 16: 95.26 – 95.3 Mb
PubMed search [1] [2]
Wikidata
View/Edit HumanView/Edit Mouse

Potassium inwardly-rectifying channel, subfamily J, member 15, also known as KCNJ15 is a human gene, which encodes the Kir4.2 protein.[3]

Function

Potassium channels are present in most mammalian cells, where they participate in a wide range of physiologic responses. Kir4.2 is an integral membrane protein and inward-rectifier type potassium channel. Kir4.2 has a greater tendency to allow potassium to flow into a cell rather than out of a cell. Three transcript variants encoding the same protein have been found for this gene.[3]

The existing literature describing KCNJ15 and Kir4.2 is sparse. In spite of some initial channel nomenclature confusion, in which the gene was referred to as Kir1.3[4] the channel was first cloned from human kidney by Shuck and coworkers in 1997.[5] Shortly thereafter it was shown that mutation of an extracellular lysine residue resulted in 6-fold increase in K+ current.[6] Two years later, in 1999, voltage clamp measurements in xenopus oocytes found that intracellular acidification decreased the potassium current of Kir4.2. Also activation of protein kinase C decreased the current although in a non-reversible fashion. Furthermore, it was found that coexpression with related potassium channel Kir5.1, changed these results somewhat, which the authors concluded was likely to be a result of heterodimerization.[4] Further voltage clamp investigations found the exact pH sensitivity (pKa = 7.1), open probability (high) and conductance of ~25 pS.[7] In 2007 the channel was found to interact with the Calcium-sensing receptor in human kidney, using a yeast-two-hybrid system. This co-localization was verified at the protein level using both immunofluorescence techniques and coimmunoprecipitation of Kir4.2 and the Calcium-sensing receptor.[8] Also a mutational study of Kir4.2 has demonstrated that removal of a c-terminal tyrosine increased the K+ current more than 10-fold.[9] Because the channel has a very high open probability, the authors of this last article conclude that this increase is mediated by increased trafficking of the protein to the membrane and not increased single-channel conductance. This same line of reasoning is applicable to the initial work of Derst and coworkers.[6]

Interactions

KCNJ15 has been shown to interact with Interleukin 16.[10]

See also

References

  1. ↑ "Human PubMed Reference:".
  2. ↑ "Mouse PubMed Reference:".
  3. 1 2 "Entrez Gene: KCNJ15 potassium inwardly-rectifying channel, subfamily J, member 15".
  4. 1 2 Pearson WL, Dourado M, Schreiber M, Salkoff L, Nichols CG (1999). "Expression of a functional Kir4 family inward rectifier K+ channel from a gene cloned from mouse liver". J. Physiol. (Lond.). 514 ( Pt 3) (3): 639–653. doi:10.1111/j.1469-7793.1999.639ad.x. PMC 2269105Freely accessible. PMID 9882736.
  5. ↑ Shuck ME, Piser TM, Bock JH, Slightom JL, Lee KS, Bienkowski MJ (1997). "Cloning and characterization of two K+ inward rectifier (Kir) 1.1 potassium channel homologs from human kidney (Kir1.2 and Kir1.3)". J. Biol. Chem. 272 (1): 586–593. doi:10.1074/jbc.272.1.586. PMID 8995301.
  6. 1 2 Derst C, Wischmeyer E, Preisig-Müller R, et al. (1998). "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. 273 (37): 23884–23891. doi:10.1074/jbc.273.37.23884. PMID 9727001.
  7. ↑ Pessia M, Imbrici P, D'Adamo MC, Salvatore L, Tucker SJ (2001). "Differential pH sensitivity of Kir4.1 and Kir4.2 potassium channels and their modulation by heteropolymerisation with Kir5.1". J. Physiol. (Lond.). 532 (Pt 2): 359–367. doi:10.1111/j.1469-7793.2001.0359f.x. PMC 2278540Freely accessible. PMID 11306656.
  8. ↑ Huang C, Sindic A, Hill CE, et al. (2007). "Interaction of the Ca2+-sensing receptor with the inwardly rectifying potassium channels Kir4.1 and Kir4.2 results in inhibition of channel function". Am. J. Physiol. Renal Physiol. 292 (3): F1073–F1081. doi:10.1152/ajprenal.00269.2006. PMID 17122384.
  9. ↑ Pearson WL, Skatchkov SN, Eaton MJ, Nichols CG (2006). "C-terminal determinants of Kir4.2 channel expression". J. Membr. Biol. 213 (3): 187–193. doi:10.1007/s00232-006-0058-6. PMID 17468958.
  10. ↑ Kurschner, C; Yuzaki, M (Sep 1999). "Neuronal interleukin-16 (NIL-16): a dual function PDZ domain protein". J. Neurosci. 19 (18): 7770–80. PMID 10479680.

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

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