Structural mechanisms of voltage sensing in G protein coupled receptors

Owen N. Vickery, Jan-Philipp Machtens, Giulia Tamburrino, Daniel Seeliger, Ulrich Zachariae (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
183 Downloads (Pure)

Abstract

G-protein-coupled receptors (GPCRs) form the largest superfamily of membrane proteins and one-third of all drug targets in humans. A number of recent studies have reported evidence for substantial voltage regulation of GPCRs. However, the structural basis of GPCR voltage sensing has remained enigmatic. Here, we present atomistic simulations on the δ-opioid and M2 muscarinic receptors, which suggest a structural and mechanistic explanation for the observed voltage-induced functional effects. The simulations reveal that the position of an internal Na+ ion, recently detected to bind to a highly conserved aqueous pocket in receptor crystal structures, strongly responds to voltage changes. The movements give rise to gating charges in excellent agreement with previous experimental recordings. Furthermore, free energy calculations show that these rearrangements of Na+ can be induced by physiological membrane voltages. Due to its role in receptor function and signal bias, the repositioning of Na+ has important general implications for signal transduction in GPCRs.
Original languageEnglish
Pages (from-to)997-1007
Number of pages11
JournalStructure
Volume24
Issue number6
Early online date19 May 2016
DOIs
Publication statusPublished - 7 Jun 2016

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