Numerous physiological functions rely on distinguishing temperature through temperature-sensitive transient receptor potential channels (thermo-TRPs). Although the function of thermo-TRPs has been studied extensively, structural determination of their heat- and cold-activated states has remained a challenge. Here, we present cryo-EM structures of the nanodisc-reconstituted wild-type mouse TRPV3 in three distinct conformations: closed, heat-activated sensitized and open states. The heat-induced transformations of TRPV3 are accompanied by changes in the secondary structure of the S2-S3 linker and the N and C termini and represent a conformational wave that links these parts of the protein to a lipid occupying the vanilloid binding site. State-dependent differences in the behavior of bound lipids suggest their active role in thermo-TRP temperature-dependent gating. Our structural data, supported by physiological recordings and molecular dynamics simulations, provide an insight for understanding the molecular mechanism of temperature sensing.
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All data needed to evaluate the conclusions of the paper are provided in the paper or the Supplementary Information. Cryo-EM density maps have been deposited to the Electron Microscopy Data Bank (EMDB) under the accession codes EMD-23853 (mTRPV3 closed, 4 °C, MSP2N2), EMD-23854 (mTRPV3 closed, 42 °C, MSP2N2), EMD-23855 (mTRPV3 sensitized, 42 °C, MSP2N2), EMD-23856 (mTRPV3 closed, 4 °C, cNW11), EMD-23857 (mTRPV3 closed, 42 °C, cNW11) and EMD-23858 (mTRPV3 open, 42 °C, cNW11) (Table 1). The corresponding model coordinates have been deposited to the Protein Data Bank (PDB) under accession codes 7MIJ (mTRPV3 closed, 4 °C, MSP2N2), 7MIK (mTRPV3 closed, 42 °C, MSP2N2), 7MIL (mTRPV3 sensitized, 42 °C, MSP2N2), 7MIM (mTRPV3 closed, 4 °C, cNW11), 7MIN (mTRPV3 closed, 42 °C, cNW11) and 7MIO (mTRPV3 open, 42 °C, cNW11) (Table 1). Source data are provided with this paper.
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We thank S. Mulligan (Pacific Northwest Center for Cryo-EM), U. Baxa and T. Edwards (National Cancer Institute, The Frederick National Laboratory), R. Grassucci, Y.-C. Chi, Z. Zhang, C. Wang, J. Wang (Columbia University Cryo-Electron Microscopy Center) and H. Kuang (New York Structural Biology Center/National Center for CryoEM Access and Training) for help with microscope operation and data collection, personnel of the Supercomputer Center ‘Polytechnical’ at the St Petersburg Polytechnic University for access to the facility and D. Nolde for assistance with supercomputing. This research was, in part, supported by the National Cancer Institute’s National Cryo-EM Facility at the Frederick National Laboratory for Cancer Research under contract no. HSSN261200800001E. Some of this work was performed at the Columbia University Cryo-Electron Microscopy Center. A portion of this research was supported by NIH grant no. U24GM129547 and performed at the PNCC at OHSU and accessed through EMSL (grid.436923.9), a DOE Office of Science User Facility sponsored by the Office of Biological and Environmental Research. Some of this work was performed at the National Center for CryoEM Access and Training (NCCAT) and the Simons Electron Microscopy Center located at the New York Structural Biology Center, supported by the NIH Common Fund Transformative High Resolution Cryo-Electron Microscopy program (U24 GM129539) and by grants from the Simons Foundation (SF349247) and NY State Assembly Majority. MD simulations work was supported by the Russian Science Foundation (project #18-14-00375). Water and ion conductivity analysis was supported by the Russian Foundation for Basic Research (project #19-04-00350). Supercomputer calculations were supported within the framework of the HSE University Basic Research Program and the Russian Academic Excellence Project ‘5-100’. Whole-cell patch-clamp recordings were supported by Czech Science Foundation (project #19-03777 S). A.I.S. was supported by the NIH (R01 CA206573, R01 NS083660, R01 NS107253) and NSF (1818086).
The authors declare no competing interests.
Peer review information Nature Structural & Molecular Biology thanks Chia-Hsueh Lee and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Florian Ullrich was the primary editor on this article and managed its editorial process and peer review in collaboration with the rest of the editorial team.
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a, A representative continuous recording of current from multiple TRPV3 channels occasionally reconstituted into the synthetic lipid bilayer (black) in response to the temperature ramp from 22 to 42 °C (red), with the membrane potential alternating between +100 mV (red circles) and –100 mV (blue circles). Note the sharp increase in current activity in the 36–42 °C temperature range. b, Temperature dependence of the open probability Po at +100 mV calculated using single-channel recordings (see examples in Fig. 1b; n = 19 independent experiments; 189,976 events were analyzed; the data includes the previously published12 and new recordings). Fitting of the data allows estimation of the temperature coefficient, Q10 = 27.0 ± 7.4 (n = 19 independent experiments). c, Van’t Hoff plot of the equilibrium constant Keq calculated using the values of Po (see Methods). Linear fits in the 22–36 °C and 36–42 °C temperature ranges provide the values of changes in enthalpy and entropy for the temperature-induced activation of TRPV3. Data in b and c are presented as mean values ± SEM. Source data for b and c are available online.
Map versus model FSC curves with and without mask were calculated using Mtriage as part of Phenix package59.
a, Stereo view of an ARD fragment of the 1.98-Å resolution cryo-EM map of TRPV3 reconstituted in MSP2N2 nanodiscs and incubated at 4 °C. b, Fragments of the same map for the membrane segments and TRP helix.
a, Pore-forming domains of TRPV3 in the sensitized state with the residues lining the pore shown as sticks. Only two of four subunits are shown, with the front and back subunits omitted for clarity. The pore profile is shown as a space-filling model (light blue). b, Distribution of water (blue mesh) and ions (red mesh) during MD simulations of TRPV3 in the sensitized state, illustrating the lack of pore permeation. c, The pore radius for different TRPV3 structures calculated using HOLE79. The vertical dashed line denotes the radius of a water molecule, 1.4 Å. d, Superposition of a single subunit from different closed-state structures of TRPV3, with the main structural elements labeled. The root-mean-square deviation (RMSD) calculated for each pair of these subunits ranges between 0.314 and 0.441 Å. e-f, Superposition of TRPV3 structures in the closed (MSP2N2, 4 °C; green) and sensitized (pink) states (RMSD, 3.098 Å) viewed parallel to the membrane (e) or intracellularly (f). g-h, Superposition of TRPV3 structures in the closed (MSP2N2, 4 °C; green) and open (orange) states (RMSD, 3.293 Å) viewed parallel to the membrane (g) or intracellularly (h). Only two of four subunits are shown in (e) and (g) with the front and back subunits omitted for clarity. Note (e-h) that TRPV3 in the sensitized and open states becomes shorter and its intracellular skirt undergoes a clockwise rotation when viewed intracellularly.
Extended Data Fig. 6 Overview of cryo-EM data collected for mTRPV3 in cNW11 nanodiscs at 42 °C and 3D reconstruction workflow.
Representative micrographs with example particles circled in yellow and reference-free 2D class averages in different orientations are shown. Three datasets were collected and joined after particle clean-up. All processing steps were done in Relion, except the 2D/3D particle clean-up that was done in cryoSPARC.
a, Conductance of water and Na+ ions through the selectivity filter and gate of the closed, sensitized and open TRPV3 plotted against the time course of MD simulation. Note that the closed state shows no permeation, the sensitized state permeates water through the selectivity filter only and the open state permeates water and Na+ ions through both selectivity filter and gate. b-g, Averaged MD density distributions (yellow) for non-hydrogen atoms of phosphatidylethanolamine (PE, b), phosphatidylinositol (PI, c), phosphatidylserine (PS, d), phosphatidylcholine (PC, e), phosphatidylglycerol (PG, f) and cholesterol (g) lipids nested in the vanilloid site of the closed TRPV3 at the beginning of 500-ns simulations. Black mesh shows cryo-EM density. MD snapshots of lipid molecules and residues coordinating their heads are shown in sticks. Chemical structures of the lipid molecules are shown to the left of each structural panel. The overlap of MD and EM densities are 26% for PE, 30% for PI, 36% for PS, 30% for PC, 33% for PG and 24% for cholesterol, calculated by multiplying the overlapping volume of MD and cryo-EM densities by two and dividing by their sum.
a-b, Overall superposition (RMSD, 2.131 Å) of the open-state structures of wild-type TRPV3 (orange) and previously published Y564A mutant12 (blue, PDB ID: 6PVP) viewed parallel to the membrane (a) and extracellularly (b). c, Single-subunit superposition based on the transmembrane domains (RMSD, 0.943 Å). Note, the most pronounced conformational differences are observed for the S1-S2, S2-S3, S5-P and ARD loops, while the transmembrane domains and TRP helices superpose closely.
α helices and β strands are depicted above the sequences as cylinders and arrows, respectively. The * symbols indicate residues in the ARD and linker domain that interact with residues in the C-terminus (¥ symbols). Red rectangular outlines denote regions involved in the interaction of the C-terminus with the ARD and linker domain, including residues conserved in thermo-TRPVs, and the AR5 and linker domain loops, which are present in thermo-TRPVs and absent in TRPV5–6. The location of the selectivity filter (S.F.) is indicated by a red box. Identical residues are colored red and highlighted in light pink. Positions of the previously identified mutations in TRPV3 that are critical for thermal sensitivity are highlighted in dark pink.
Extended Data Fig. 10 Conformational changes accompanying temperature-induced opening of wild-type TRPV3.
Superposition of the closed- and heat-activated open-state structures of TRPV3 (cNW11, 42 °C) viewed parallel to the membrane is shown in the centre. Insets show select regions with the arrows indicating the displacement of domains in the open relative to the closed state. The lipid at the vanilloid site is shown in sticks (pink).
Structural heterogeneity of particles in a cryo-EM sample subjected to temperature cycles. 3D variability analysis of TRPV3 particles in cNW11 nanodiscs. Morph transition between open and closed states was calculated in cryoSPARC.
Structural transitions between closed, sensitized and open states. Regions involved in gating dynamics are highlighted in pink, with the elements undergoing the strongest structural changes highlighted in dark pink.
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Nadezhdin, K.D., Neuberger, A., Trofimov, Y.A. et al. Structural mechanism of heat-induced opening of a temperature-sensitive TRP channel. Nat Struct Mol Biol 28, 564–572 (2021). https://doi.org/10.1038/s41594-021-00615-4
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