Conformational plasticity in the selectivity filter of the TRPV2 ion channel.

Published

Journal Article

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. Combined with functional characterizations, our studies reveal a structural basis for permeation of Ca2+ and large organic cations in TRPV2.

Full Text

Duke Authors

Cited Authors

  • Zubcevic, L; Le, S; Yang, H; Lee, S-Y

Published Date

  • May 2018

Published In

Volume / Issue

  • 25 / 5

Start / End Page

  • 405 - 415

PubMed ID

  • 29728656

Pubmed Central ID

  • 29728656

Electronic International Standard Serial Number (EISSN)

  • 1545-9985

Digital Object Identifier (DOI)

  • 10.1038/s41594-018-0059-z

Language

  • eng

Conference Location

  • United States