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Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Svobodova, B; Lichtenegger, M; Platzer, D; Di Giuro, CML; de la Cruz, GG; Glasnov, T; Schreibmayer, W; Groschner, K.
A single point mutation in the TRPC3 lipid-recognition window generates supersensitivity to benzimidazole channel activators.
CELL CALCIUM. 2019; 79(3): 27-34.
Doi: 10.1016/j.ceca.2019.02.007
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- Führende Autor*innen der Med Uni Graz
- Groschner Klaus
- Svobodova Barbora
- Co-Autor*innen der Med Uni Graz
- Di Giuro Cristiana Maria Loredana
- Lichtenegger Michaela
- Platzer Dieter
- Schreibmayer Wolfgang
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- Abstract:
- Mutation of a single residue within the recently identified lipid (diacylglycerol) recognition window of TRPC3 (G652A) was found to abolish channel activation via endogenous lipid mediators while retaining sensitivity to the non-lipid activator GSK1702934A (abb. GSK). The mechanism of this change in chemical sensing by TRPC3 was analysed by whole-cell and single channel electrophysiology as well as Ca2+ imaging. Currents initiated by GSK or the structural (benzimidazole) analog BI-2 were significantly larger in cells expressing the G652A mutant as compared to wild type (WT) channels. Whole cell patch-clamp experiments revealed that enhanced sensitivity to benzimidazoles was not due to augmented potency but reflected enhanced efficacy of benzimidazoles. Single channel analysis demonstrated that neither unitary conductance nor I-V characteristics were altered by the G652A mutation, precluding altered pore architecture as the basis of enhanced efficacy. These experiments uncovered a distinct gating pattern of BI-2-activated G652A mutant channels, featuring a unique, long-lived open state. Moreover, G652A mutant channels lacked PLC/diacylglycerol mediated cross-desensitization for GSK activation as typically observed for TRPC3. Lack of desensitization in G652A channels enabled large GSK/BI-2-induced Ca2+ signals in conditions that fully desensitized TRPC3 WT channels. We demonstrate that the lipid-recognition window of TRPC3 determines both sensitivity to lipid mediators and chemical gating by benzimidazoles. TRPC3 mutations within this lipid interaction site are suggested as a basis for chemogenetic targeting of TRPC3-signaling. Copyright © 2019 The Authors. Published by Elsevier Ltd.. All rights reserved.
- Find related publications in this database (Keywords)
- TRPC3
- Gating mechanism
- Benzimidazole agonists
- Lipid regulation