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Novel application of Macrolampis sp2 firefly luciferase for intracellular pH-biosensing in mammalian cells

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Abstract

Bioluminescence is widely used in biosensors. Firefly luciferase-based bioluminescent sensors are among the most popular ones. Firefly luciferases are pH-sensitive, displaying a large red shift at acidic pH, a property that has been considered undesirable for most applications. Currently, biosensors that can detect intracellular pH are in demand, and some fluorescent biosensors are available. However, pH sensors using bioluminescence have not been used yet. Thus, we decided to harness a firefly luciferase to measure the intracellular pH in mammalian cells. For this purpose, we engineered the luciferase derived from Macrolampis sp2 firefly to localize it on the cytosol or nucleus, in order to observe pH variation in these compartments during biological activities. We first calibrated the emission ratios (R = Igreen/Ired) at different pH values. As expected, we observed a red shift of light emission under acidic conditions when the cells were subjected to different pH conditions in the presence of the K+/H+ ionophore, nigericin. Based on these results, we concluded that this firefly luciferase can be used as a diagnostic tool for measuring the intracellular pH variation in pathogenic cells or in cells during apoptosis. This is the first example of real time-monitoring of pH change using color tuning luciferase.

Graphical abstract: Novel application of Macrolampis sp2 firefly luciferase for intracellular pH-biosensing in mammalian cells

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Publication details

The article was received on 15 Dec 2018, accepted on 19 Feb 2019 and first published on 28 Feb 2019


Article type: Paper
DOI: 10.1039/C8PP00573G
Citation: Photochem. Photobiol. Sci., 2019, Advance Article

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    Novel application of Macrolampis sp2 firefly luciferase for intracellular pH-biosensing in mammalian cells

    G. V. D. M. Gabriel, R. Yasuno, Y. Mitani, Y. Ohmiya and V. R. Viviani, Photochem. Photobiol. Sci., 2019, Advance Article , DOI: 10.1039/C8PP00573G

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