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• W2044888394 abstract "The transient receptor potential vanilloid receptor subtype I (TRPV1) channel acts as a polymodal sensory receptor gated by chemical and physical stimuli. Like other TRP channels, TRPV1 contains in its C terminus a short, conserved domain called the TRP box, which is necessary for channel gating. Substitution of two TRP box residues—I696 and W697—with Ala markedly affects TRPV1’s response to all activating stimuli, which indicates that these two residues play a crucial role in channel gating. We systematically replaced I696 and W697 with 18 native l-amino acids (excluding cysteine) and evaluated the effect on voltage- and capsaicin-dependent gating. Mutation of I696 decreased channel activation by either voltage or capsaicin; furthermore, gating was only observed with substitution of hydrophobic amino acids. Substitution of W697 with any of the 18 amino acids abolished gating in response to depolarization alone, shifting the threshold to unreachable voltages, but not capsaicin-mediated gating. Moreover, vanilloid-activated responses of W697X mutants showed voltage-dependent gating along with a strong voltage-independent component. Analysis of the data using an allosteric model of activation indicates that mutation of I696 and W697 primarily affects the allosteric coupling constants of the ligand and voltage sensors to the channel pore. Together, our findings substantiate the notion that inter- and/or intrasubunit interactions at the level of the TRP box are critical for efficient coupling of stimulus sensing and gate opening. Perturbation of these interactions markedly reduces the efficacy and potency of the activating stimuli. Furthermore, our results identify these interactions as potential sites for pharmacological intervention." @default.
• W2044888394 created "2016-06-24" @default.
• W2044888394 creator A5008264149 @default.
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• W2044888394 date "2014-02-24" @default.
• W2044888394 modified "2023-10-14" @default.
• W2044888394 title "Mutation of I696 and W697 in the TRP box of vanilloid receptor subtype I modulates allosteric channel activation" @default.
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• W2044888394 doi "https://doi.org/10.1085/jgp.201311070" @default.
• W2044888394 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3933934" @default.
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