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• W2530084320 abstract "Firefly luciferase (Fluc) is frequently used to report circadian gene expression rhythms in mammalian cells and tissues. During longitudinal assays it is generally assumed that enzymatic substrates are in saturating excess, such that total bioluminescence is directly proportional to Fluc protein level. To test this assumption, we compared the enzyme kinetics of purified luciferase with its activity in mammalian cells. We found that Fluc activity in solution has a lower Michaelis constant (K m ) for luciferin, lower temperature dependence, and lower catalytic half-life than Fluc in cells. In consequence, extracellular luciferin concentration significantly affects the apparent circadian amplitude and phase of the widely used PER2::LUC reporter in cultured fibroblasts, but not in SCN, and we suggest that this arises from differences in plasma membrane luciferin transporter activity. We found that at very high concentrations (>1 mM), luciferin lengthens circadian period, in both fibroblasts and organotypic SCN slices. We conclude that the amplitude and phase of circadian gene expression inferred from bioluminescence recordings should be treated with some caution, and we suggest that optimal luciferin concentration should be determined empirically for each luciferase reporter and cell type." @default.
• W2530084320 created "2016-10-21" @default.
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• W2530084320 date "2016-10-10" @default.
• W2530084320 modified "2023-10-16" @default.
• W2530084320 title "In-depth Characterization of Firefly Luciferase as a Reporter of Circadian Gene Expression in Mammalian Cells" @default.
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• W2530084320 doi "https://doi.org/10.1177/0748730416668898" @default.
• W2530084320 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5117186" @default.
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