KCNA4

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KCNA4
Identifiers
AliasesKCNA4, HBK4, HK1, HPCN2, HUKII, KCNA4L, KCNA8, KV1.4, PCN2, potassium voltage-gated channel subfamily A member 4, MCIDDS
External IDsOMIM: 176266 MGI: 96661 HomoloGene: 20514 GeneCards: KCNA4
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_002233

NM_021275

RefSeq (protein)

NP_002224

NP_067250

Location (UCSC)Chr 11: 30.01 – 30.02 MbChr 2: 107.12 – 107.13 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse
Potassium channel Kv1.4 tandem inactivation domain
solution structure of the tandem inactivation domain (residues 1-75) of potassium channel rck4 (kv1.4)
Identifiers
SymbolK_channel_TID
PfamPF07941
InterProIPR012897
SCOP21kn7 / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

Potassium voltage-gated channel subfamily A member 4 also known as Kv1.4 is a protein that in humans is encoded by the KCNA4 gene.[5][6][7] It contributes to the cardiac transient outward potassium current (Ito1), the main contributing current to the repolarizing phase 1 of the cardiac action potential.[8]

Description

Template:PBB Summary

KCNA4 (Kv1.4) contains a tandem inactivation domain at the N terminus. It is composed of two subdomains. Inactivation domain 1 (ID1, residues 1-38) consists of a flexible N terminus anchored at a 5-turn helix, and is thought to work by occluding the ion pathway, as is the case with a classical ball domain. Inactivation domain 2 (ID2, residues 40-50) is a 2.5 turn helix with a high proportion of hydrophobic residues that probably serves to attach ID1 to the cytoplasmic face of the channel. In this way, it can promote rapid access of ID1 to the receptor site in the open channel. ID1 and ID2 function together to bring about fast inactivation of the Kv1.4 channel, which is important for the role of the channel in short-term plasticity.[9]

Interactions

KCNA4 has been shown to interact with DLG4,[10][11][12][13] KCNA2[14] and DLG1.[10][12][15]

See also

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000182255Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000042604Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Philipson LH, Schaefer K, LaMendola J, Bell GI, Steiner DF (Feb 1991). "Sequence of a human fetal skeletal muscle potassium channel cDNA related to RCK4". Nucleic Acids Res. 18 (23): 7160. doi:10.1093/nar/18.23.7160. PMC 332806. PMID 2263489.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ^ Gutman GA, Chandy KG, Grissmer S, Lazdunski M, McKinnon D, Pardo LA, Robertson GA, Rudy B, Sanguinetti MC, Stuhmer W, Wang X (Dec 2005). "International Union of Pharmacology. LIII. Nomenclature and molecular relationships of voltage-gated potassium channels". Pharmacol Rev. 57 (4): 473–508. doi:10.1124/pr.57.4.10. PMID 16382104.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. ^ "Entrez Gene: KCNA4 potassium voltage-gated channel, shaker-related subfamily, member 4".
  8. ^ Oudit GY, Kassiri Z, Sah R, Ramirez RJ, Zobel C, Backx PH (May 2001). "The molecular physiology of the cardiac transient outward potassium current (I(to)) in normal and diseased myocardium". J. Mol. Cell. Cardiol. 33 (5): 851–72. doi:10.1006/jmcc.2001.1376. PMID 11343410.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  9. ^ Wissmann R, Bildl W, Oliver D, Beyermann M, Kalbitzer HR, Bentrop D, Fakler B (May 2003). "Solution structure and function of the "tandem inactivation domain" of the neuronal A-type potassium channel Kv1.4". J. Biol. Chem. 278 (18): 16142–50. doi:10.1074/jbc.M210191200. PMID 12590144.{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: unflagged free DOI (link)
  10. ^ a b Inanobe, Atsushi; Fujita Akikazu; Ito Minoru; Tomoike Hitonobu; Inageda Kiyoshi; Kurachi Yoshihisa (Jun 2002). "Inward rectifier K+ channel Kir2.3 is localized at the postsynaptic membrane of excitatory synapses". Am. J. Physiol., Cell Physiol. 282 (6). United States: C1396–403. doi:10.1152/ajpcell.00615.2001. ISSN 0363-6143. PMID 11997254. {{cite journal}}: Cite has empty unknown parameters: |laydate=, |laysource=, and |laysummary= (help)
  11. ^ Niethammer, M; Valtschanoff J G; Kapoor T M; Allison D W; Weinberg R J; Craig A M; Sheng M (Apr 1998). "CRIPT, a novel postsynaptic protein that binds to the third PDZ domain of PSD-95/SAP90". Neuron. 20 (4). UNITED STATES: 693–707. doi:10.1016/S0896-6273(00)81009-0. ISSN 0896-6273. PMID 9581762. {{cite journal}}: Cite has empty unknown parameters: |laydate=, |laysource=, and |laysummary= (help)
  12. ^ a b Kim, E; Sheng M (1996). "Differential K+ channel clustering activity of PSD-95 and SAP97, two related membrane-associated putative guanylate kinases". Neuropharmacology. 35 (7). ENGLAND: 993–1000. doi:10.1016/0028-3908(96)00093-7. ISSN 0028-3908. PMID 8938729. {{cite journal}}: Cite has empty unknown parameters: |laysummary=, |laydate=, and |laysource= (help)
  13. ^ Eldstrom, Jodene; Doerksen Kyle W; Steele David F; Fedida David (Nov 2002). "N-terminal PDZ-binding domain in Kv1 potassium channels". FEBS Lett. 531 (3). Netherlands: 529–37. doi:10.1016/S0014-5793(02)03572-X. ISSN 0014-5793. PMID 12435606. {{cite journal}}: Cite has empty unknown parameters: |laydate=, |laysource=, and |laysummary= (help)
  14. ^ Coleman, S K; Newcombe J; Pryke J; Dolly J O (Aug 1999). "Subunit composition of Kv1 channels in human CNS". J. Neurochem. 73 (2). UNITED STATES: 849–58. doi:10.1046/j.1471-4159.1999.0730849.x. ISSN 0022-3042. PMID 10428084. {{cite journal}}: Cite has empty unknown parameters: |laydate=, |laysource=, and |laysummary= (help)
  15. ^ Eldstrom, Jodene; Choi Woo Sung; Steele David F; Fedida David (Jul 2003). "SAP97 increases Kv1.5 currents through an indirect N-terminal mechanism". FEBS Lett. 547 (1–3). Netherlands: 205–11. doi:10.1016/S0014-5793(03)00668-9. ISSN 0014-5793. PMID 12860415. {{cite journal}}: Cite has empty unknown parameters: |laydate=, |laysource=, and |laysummary= (help)

Further reading

External links

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


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This article incorporates text from the public domain Pfam and InterPro: IPR012897