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- W1986242515 abstract "The ankyrin transient receptor potential channel TRPA1 is a non-selective cationic channel that is expressed by sensory neurons, where it can be activated by pungent chemicals, such as AITC (allyl isothiocyanate), cinnamon or allicin, by deep cooling (<18 °C) or highly depolarizing voltages (>+100 mV). From the cytoplasmic side, this channel can be regulated by negatively charged ligands such as phosphoinositides or inorganic polyphosphates, most likely through an interaction with as yet unidentified positively charged domain(s). In the present study, we mutated 27 basic residues along the C-terminal tail of TRPA1, trying to explore their role in AITC- and voltage-dependent gating. In the proximal part of the C-terminus, the function-affecting mutations were at Lys969, Arg975, Lys988 and Lys989. A second significant region was found in the predicted helix, centred around Lys1048 and Lys1052, in which single alanine mutations completely abolished AITC- and voltage-dependent activation. In the distal portion of the C-terminus, the charge neutralizations K1092A and R1099A reduced the AITC sensitivity, and, in the latter mutant, increased the voltage-induced steady-state responses. Taken together, our findings identify basic residues in the C-terminus that are strongly involved in TRPA1 voltage and chemical sensitivity, and some of them may represent possible interaction sites for negatively charged molecules that are generally considered to modulate TRPA1." @default.
- W1986242515 created "2016-06-24" @default.
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- W1986242515 date "2010-12-15" @default.
- W1986242515 modified "2023-10-16" @default.
- W1986242515 title "The C-terminal basic residues contribute to the chemical- and voltage-dependent activation of TRPA1" @default.
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- W1986242515 doi "https://doi.org/10.1042/bj20101256" @default.
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