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- W2022293360 abstract "The cold and menthol receptor, TRPM8, also designated CMR1, is a member of the transient receptor potential (TRP) family of excitatory ion channels. TRPM8 is a channel activated by cold temperatures, voltage, and menthol. In this study, we characterize the cold- and voltage-induced activation of TRPM8 channel in an attempt to identify the temperature- and voltage-dependent components involved in channel activation. Under equilibrium conditions, decreasing temperature has two effects. ( i ) It shifts the normalized conductance vs. voltage curves toward the left, along the voltage axis. This effect indicates that the degree of order is higher when the channel is in the open configuration. ( ii ) It increases the maximum channel open probability, suggesting that temperature affects both voltage-dependent and -independent pathways. In the temperature range between 18°C and 25°C, large changes in enthalpy (Δ H = -112 kcal/mol) and entropy (Δ S = -384 cal/mol K) accompany the activation process. The Q 10 calculated in the same temperature range is 24. This thermodynamic analysis strongly suggests that the process of opening involves large conformational changes of the channel-forming protein. Therefore, the highly temperature-dependent transition between open and closed configurations is possible because enthalpy and entropy are both large and compensate each other. Our data also demonstrate that temperature and voltage interact allosterically to enhance channel opening." @default.
- W2022293360 created "2016-06-24" @default.
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- W2022293360 date "2004-10-18" @default.
- W2022293360 modified "2023-10-03" @default.
- W2022293360 title "Clues to understanding cold sensation: Thermodynamics and electrophysiological analysis of the cold receptor TRPM8" @default.
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- W2022293360 doi "https://doi.org/10.1073/pnas.0406773101" @default.
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