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ASIC4

Protein found in humans

Summary

Protein found in humans

Acid-sensing ion channel 4 (ASIC4) also known as amiloride-sensitive cation channel 4 (ACCN4) is a protein that in humans is encoded by the ASIC4 gene. The ASIC4 gene is one of the five paralogous genes that encode proteins that form trimeric acid-sensing ion channels (ASICs) in mammals. The cDNA of this gene was first cloned in 2000. The ASIC genes have splicing variants that encode different proteins that are called isoforms.

These genes are mainly expressed in the central and peripheral nervous system.

ASICs can form both homotrimeric (meaning composed of three identical subunits) and heterotrimeric channels.

Structure and function

This gene encodes a member of the ASIC/ENaC superfamily of proteins. The members of this family are amiloride-sensitive sodium channels that contain intracellular N and C termini, 2 hydrophobic transmembrane (TM) regions, and a large extracellular loop, which has many cysteine residues with conserved spacing. The TM regions are generally symbolized as TM1 (clone to N-terminus) and TM2 (close to C-terminus).

The pore of the channel through which ions selectively flow from the extracellular side into the cytoplasm is formed by the three TM2 regions of the trimer.

References

References

  1. (Feb 2017). "ASIC and ENaC type sodium channels: Conformational states and the structures of the ion selectivity filters". The FEBS Journal.
  2. (Jun 2000). "A new member of acid-sensing ion channels from pituitary gland". NeuroReport.
  3. (Sep 2001). "Acid-sensing ion channel (ASIC) 4 gene: physical mapping, genomic organisation, and evaluation as a candidate for paroxysmal dystonia". European Journal of Human Genetics.
  4. (Sep 2000). "Mammalian ASIC2a and ASIC3 subunits co-assemble into heteromeric proton-gated channels sensitive to Gd3+". The Journal of Biological Chemistry.
  5. (Jan 2016). "Epithelial sodium channel (ENaC) family: Phylogeny, structure-function, tissue distribution, and associated inherited diseases.". Gene.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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