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Updated: Feb 28, 2026

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
Published on: February 20, 2018
Structural determinants for GPCR-mediated inhibition of TASK K2P channels by diacylglycerol and its dysfunction in
Thibault R H Jouen-Tachoire1,2,3,4, Peter Proks1,2, David Seiferth5,2
1Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK.
Abstract:
Two-Pore Domain K+ (K2P) channels are crucial determinants of the resting membrane potential and of cellular electrical excitability in many different cell types. TASK-1 and TASK-3 K2P channel activity is also coupled to GPCR signalling pathways via Gαq and their subsequent inhibition is via direct interaction with diacylglycerol (DAG) generated from phosphatidylinositol-4,5-bisphosphate (PIP2) hydrolysis. This regulation is defective in two different neurodevelopmental disorders, but the molecular mechanisms underlying this inhibitory process and the reasons for the GPCR-insensitivity of these disease-causing mutations remain unclear. Here we show that GqPCR inhibition inversely correlates with channel open probability, and results from a state-dependent destabilisation of the open state by DAG promoting channel closure. We also identify a DAG interaction-site within a groove between the M2, M3 and M4 domains, and show the crucial role of residues within this site in mediating the inhibitory effect and defining channel sensitivity. These results not only reveal the structural and molecular mechanisms underlying GqPCR regulation of TASK channels, but also explain the pathogenic effect of a common regulatory defect linked to different K2P channelopathies.
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