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• W2143918706 abstract "Abstract Background Controlling enzyme activity by ligand binding to a regulatory domain of choice may have many applications e.g. as biosensors and as tools in regulating cellular functions. However, until now only a small number of ligand-binding domains have been successfully linked to enzyme activity. G protein-coupled receptors (GPCR) are capable of recognizing an extraordinary structural variety of extracellular signals including inorganic and organic molecules. Ligand binding to GPCR results in conformational changes involving the transmembrane helices. Here, we assessed whether ligand-induced conformational changes within the GPCR helix bundle can be utilized to control the activity of an integrated enzyme. Results As a proof of principle, we inserted the luciferase amino acid sequence into the third intracellular loop of the M 3 muscarinic acetylcholine receptor. This fusion protein retained both receptor and enzyme function. Receptor blockers slightly but significantly reduced enzyme activity. By successive deletion mutagenesis the enzyme activity was optimally coupled to ligand-induced conformational helix movements. Conclusion Our results demonstrate that in engineered GPCR-enzyme chimeras, intracellular enzyme activity can be directly controlled by a GPCR serving as the extracellular ligand-binding domain." @default.
• W2143918706 created "2016-06-24" @default.
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• W2143918706 date "2009-05-18" @default.
• W2143918706 modified "2023-10-17" @default.
• W2143918706 title "Luciferase activity under direct ligand-dependent control of a muscarinic acetylcholine receptor" @default.
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• W2143918706 doi "https://doi.org/10.1186/1472-6750-9-46" @default.
• W2143918706 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2689208" @default.
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