Functional characteristic and molecular topology of voltage independent sodium channels]
Tsitologiia(1999)
Abstract
The channel proteins so far known are transmembrane oligomers arranged in a manner that the polar residues are lining the central ion-conducting hydrophilic pore. In the last decade, electrophysiology and molecular biology studies revealed the principal similarity in the functional properties and membrane topology within a large family of sodium-conducting channels. Amiloride-sensitive channels are expressed in the apical membranes of renal epithelia. Moreover, in different mammalian cells non-voltage-gated sodium-selective channels have been recently found. According to molecular cloning of the respective DNAs and amino acid sequence analysis, epithelial channel subunits, degenerins and some other channel proteins display a significant homology in the regions forming two presumable transmembrane domains. This paper reviews some relevant data and current opinions of the superfamily of sodium-conducting cation channels.
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Key words
independent sodium channels,voltage,molecular topology
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