Towards the elucidation of the structural-functional relationship of inward rectifying K+ channel family.
With recent cDNA cloning of members of the inward rectifying K+ channel family, it was revealed that they have only 2 putative transmembrane regions with no voltage-sensor element. Based on the deduced primary structure, possible schematic models to explain their characteristic features are proposed in this article. The features are (1) blocking by intracellular Mg2+, (2) intrinsic gating, (3) the triple barrel structure of the inward rectifier K+ channel and (4) the activation by the direct interaction with G-protein subunits of the muscarinic K+ channel. The recent findings of the mutagenesis study of voltage-gated K+ channels, which provide a clue for the structural-functional study of the inward rectifying K+ channels, are also looked at.
Kubo
Y
Y
Department of Neurophysiology, Tokyo Metropolitan Institute for Neuroscience, Japan.
D000595:Amino Acid Sequence; D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D003001:Cloning, Molecular; D004594:Electrophysiology; D006801:Humans; D008969:Molecular Sequence Data; D015221:Potassium Channels / Q000235:genetics* / Q000502:physiology*
D015221:Potassium Channels