Thermodynamic coupling between cold and heat activations of TRPV2
The homotetrameric thermosensitive transient receptor potential vanilloid 2 (TRPV2) channel is a biological macromolecule with unique high temperature threshold and sensitivity. However, the underlying thermodynamic basis has not been well understood. In this computational study, the 3D cryo-EM structures of rat TRPV2 in response to various chemical perturbations at different sites at low temperatures were quantified at the tertiary and quaternary levels using a highly sensit
Scientists have computationally investigated the TRPV2 channel, a protein known for its sensitivity to high temperatures. Using cryo-electron microscopy structures, they identified specific weak protein surface interactions that act as primary sensors for initial heat activation. These sensors, when undisturbed, allow for a pre-open closed state. Perturbing these sensors away from their native sites activates the channel but reduces its cold sensitivity. However, when these sensors are exposed to a mild detergent and charged residue hydrolysis, the channel exhibits high cold sensitivity, mirroring its heat activation response. Full channel opening at both upper and lower gates requires disruption of interactions between protein subunits near these heat sensors.
Understanding how TRPV2 senses temperature changes could lead to new therapeutic strategies for pain management and other conditions involving temperature-sensitive ion channels.
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