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• W2796608944 endingPage "20180108" @default.
• W2796608944 startingPage "20180108" @default.
• W2796608944 abstract "Voltage-gated proton channels are unique ion channels, membrane proteins that allow protons but no other ions to cross cell membranes. They are found in diverse species, from unicellular marine life to humans. In all cells, their function requires that they open and conduct current only under certain conditions, typically when the electrochemical gradient for protons is outwards. Consequently, these proteins behave like rectifiers, conducting protons out of cells. Their activity has electrical consequences and also changes the pH on both sides of the membrane. Here we summarize what is known about the way these proteins sense the membrane potential and the pH inside and outside the cell. Currently, it is hypothesized that membrane potential is sensed by permanently charged arginines (with very high p K a ) within the protein, which results in parts of the protein moving to produce a conduction pathway. The mechanism of pH sensing appears to involve titratable side chains of particular amino acids. For this purpose their p K a needs to be within the operational pH range. We propose a ‘counter-charge’ model for pH sensing in which electrostatic interactions within the protein are selectively disrupted by protonation of internally or externally accessible groups." @default.
• W2796608944 created "2018-04-24" @default.
• W2796608944 creator A5016708890 @default.
• W2796608944 date "2018-04-01" @default.
• W2796608944 modified "2023-10-17" @default.
• W2796608944 title "Voltage and pH sensing by the voltage-gated proton channel, H_V1" @default.
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