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Updated: Nov 24, 2025

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
Published on: February 20, 2018
Tctex-1 augments G protein-coupled receptor-mediated Gs signaling by activating adenylyl cyclase
Masaki Saito1, Ayano Chiba2, Takeya Sato3
1Department of Molecular Pharmacology, Tohoku University Graduate School of Medicine, Sendai, 980-8575, Japan; Department of Cellular Signaling, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, 980-8578, Japan.
Abstract:
Proteins interacting with G protein-coupled receptors (GPCRs) can modulate signal transduction of these receptors. However, the regulatory mechanisms of the interacting proteins are diverse and largely unknown. We have previously shown that Tctex-1 (or DYNLT1) can interact with the parathyroid hormone receptor (PTHR). In the present study, we investigated the role of Tctex-1 in the PTHR signaling and found that Tctex-1 augmented the PTHR-mediated Gs/adenylyl cyclase (AC) pathway by activating AC regardless of the binding to PTHR. Furthermore, Tctex-1 directly bound to AC type 6. These data demonstrate a novel mechanism underlying GPCR/Gs signaling regulated by Tctex-1.
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