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- W2945416864 abstract "Inwardly rectifying potassium (Kir) channels play a variety of critical cellular roles including modulating membrane excitability in neurons, cardiomyocytes and muscle cells, and setting the resting membrane potential, heart rate, vascular tone, insulin release, and salt flow across epithelia. These processes are regulated by a variegated list of modulators. In particular, in recent years, cholesterol has been shown to modulate a growing number of Kir channels. Subsequent to the discovery that members of the Kir2 subfamily were down-regulated by cholesterol, we have shown that members of several other Kir subfamilies were also modulated by cholesterol. However, not all cholesterol sensitive Kir channels were down-regulated by cholesterol. Our recent studies focused on three Kir channels: Kir2.1 (IRK1), Kir3.2^ (GIRK2^) and Kir3.4* (GIRK4*). Among these, Kir2.1 was down-regulated by cholesterol whereas Kir3.2^ and Kir3.4* were both up-regulated by cholesterol. Despite the opposite impact of cholesterol on these Kir3 channels compared to Kir2.1, putative cholesterol binding sites in all three channels were identified in equivalent transmembrane domains. Interestingly, however, there are intriguing differences in the specific residues that interact with the cholesterol molecule in these Kir channels. Here we compare and contrast the molecular characteristics of the putative cholesterol binding sites in the three channels, and discuss the potential implications of the differences for the impact of cholesterol on ion channels." @default.
- W2945416864 created "2019-05-29" @default.
- W2945416864 creator A5018812721 @default.
- W2945416864 date "2019-01-01" @default.
- W2945416864 modified "2023-09-27" @default.
- W2945416864 title "Cholesterol Binding Sites in Inwardly Rectifying Potassium Channels" @default.
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- W2945416864 doi "https://doi.org/10.1007/978-3-030-14265-0_7" @default.
- W2945416864 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31098814" @default.
- W2945416864 hasPublicationYear "2019" @default.
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