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Published on: December 31, 2013
Site-specific contacts enable distinct modes of TRPV1 regulation by the potassium channel Kvβ1 subunit
Yuanyuan Wang1, Xiaoyi Mo1, Conghui Ping1
1State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Frontier Science Center for Immunology and Metabolism, Wuhan University, Wuhan, Hubei, China.
Abstract:
Transient receptor potential vanilloid 1 (TRPV1) channel is a multimodal receptor that is responsible for nociceptive, thermal, and mechanical sensations. However, which biomolecular partners specifically interact with TRPV1 remains to be elucidated. Here, we used cDNA library screening of genes from mouse dorsal root ganglia combined with patch-clamp electrophysiology to identify the voltage-gated potassium channel auxiliary subunit Kvβ1 physically interacting with TRPV1 channel and regulating its function. The interaction was validated in situ using endogenous dorsal root ganglia neurons, as well as a recombinant expression model in HEK 293T cells. The presence of Kvβ1 enhanced the expression stability of TRPV1 channels on the plasma membrane and the nociceptive current density. Surprisingly, Kvβ1 interaction also shifted the temperature threshold for TRPV1 thermal activation. Using site-specific mapping, we further revealed that Kvβ1 interacted with the membrane-distal domain and membrane-proximal domain of TRPV1 to regulate its membrane expression and temperature-activation threshold, respectively. Our data therefore suggest that Kvβ1 is a key element in the TRPV1 signaling complex and exerts dual regulatory effects in a site-specific manner.
Insights
The voltage-gated potassium channel subunit Kvβ1 interacts with the Transient Receptor Potential Vanilloid 1 (TRPV1) channel. This interaction enhances TRPV1 membrane expression and modulates its thermal activation, impacting pain sensation.
Area of Science:
- Neuroscience
- Molecular Biology
- Ion Channel Physiology
Background:
- Transient Receptor Potential Vanilloid 1 (TRPV1) channels mediate pain, thermal, and mechanical sensations.
- The specific biomolecular partners interacting with TRPV1 and their regulatory roles are not fully understood.
Purpose of the Study:
- To identify proteins interacting with TRPV1 and elucidate their function.
- To characterize the interaction between TRPV1 and Kvβ1 and its impact on TRPV1 channel activity.
Main Methods:
- cDNA library screening of mouse dorsal root ganglia.
- Patch-clamp electrophysiology.
- In situ validation in endogenous neurons and recombinant HEK 293T cells.
- Site-specific mapping of interaction domains.
Main Results:
- Kvβ1 was identified as a physical interactor of TRPV1.
- Kvβ1 enhances TRPV1 plasma membrane expression and nociceptive current density.
- Kvβ1 interaction alters the temperature threshold for TRPV1 activation.
- Kvβ1 interacts with distinct TRPV1 domains to regulate membrane expression and thermal gating.
Conclusions:
- Kvβ1 is a key component of the TRPV1 signaling complex.
- Kvβ1 exerts dual, site-specific regulatory effects on TRPV1 function.
- This interaction provides new insights into the molecular mechanisms of pain and thermal sensation.
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