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Title: Conformational plasticity in the selectivity filter of the TRPV2 ion channel

Journal Article · · Nature Structural & Molecular Biology

Transient receptor potential vanilloid (TRPV) channels are activated by ligands and heat and are involved in various physiological processes. In contrast to the architecturally related voltage-gated cation channels, TRPV1 and TRPV2 subtypes possess another activation gate at the selectivity filter that can open widely enough to permeate large organic cations. Despite recent structural advances, the mechanism of selectivity filter gating and permeation for both metal ions and large molecules by TRPV1 or TRPV2 is not well known. Here, we determined two crystal structures of rabbit TRPV2 in its Ca2+-bound and resiniferatoxin (RTx)- and Ca2+-bound forms, to 3.9 Å and 3.1 Å, respectively. Notably, our structures show that RTx binding leads to two-fold symmetric opening of the selectivity filter of TRPV2 that is wide enough for large organic cation permeation. Furthermore,combined with functional characterizations, our studies reveal a structural basis for permeation of Ca2+ and large organic cations in TRPV2.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH)
Grant/Contract Number:
W-31-109-Eng-38; NIH R35 NS097241; NIH R00 NS086916; NIH DP2 GM126898; P41GM103403; S10 RR029205
OSTI ID:
1438842
Journal Information:
Nature Structural & Molecular Biology, Vol. 25, Issue 5; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (21)

The TRPV2 cation channels: from urothelial cancer invasiveness to glioblastoma multiforme interactome signature journal October 2019
The conformational wave in capsaicin activation of transient receptor potential vanilloid 1 ion channel journal July 2018
Visualizing structural transitions of ligand-dependent gating of the TRPM2 channel journal August 2019
Structures of TRPV2 in distinct conformations provide insight into role of the pore turret journal December 2018
Human mutations highlight an intersubunit cation–π bond that stabilizes the closed but not open or inactivated states of TRPV channels journal April 2019
TRP ion channels: Proteins with conformational flexibility journal January 2019
Voltage vs. Ligand I: Structural basis of the intrinsic flexibility of S3 segment and its significance in ion channel activation journal January 2019
Structural mechanisms of transient receptor potential ion channels journal January 2020
A hypothetical molecular mechanism for TRPV1 activation that invokes rotation of an S6 asparagine journal October 2018
Transient Receptor Potential Channels and Calcium Signaling journal March 2019
Structural basis of cooling agent and lipid sensing by the cold-activated TRPM8 channel journal February 2019
New Insights Into Permeation of Large Cations Through ATP-Gated P2X Receptors journal July 2018
Ca2+ Signaling and IL-8 Secretion in Human Testicular Peritubular Cells Involve the Cation Channel TRPV2 journal September 2018
Symmetry transitions during gating of the TRPV2 ion channel in lipid membranes journal May 2019
Regulatory switch at the cytoplasmic interface controls TRPV channel gating journal May 2019
Molecular mechanism of TRPV2 channel modulation by cannabidiol journal September 2019
The ion selectivity filter is not an activation gate in TRPV1-3 channels journal November 2019
The Conformational Wave in Capsaicin Activation of Transient Receptor Potential Vanilloid 1 Ion Channel journal February 2019
Conformational Ensemble of the Human TRPV3 Ion Channel journal February 2019
Conserved allosteric pathways for activation of TRPV3 revealed through engineering vanilloid-sensitivity journal January 2019
Conformational ensemble of the human TRPV3 ion channel journal November 2018