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How does the relative activity of Renilla Luciferase compare to Firefly Luciferase?
Firefly luciferase acts on luciferin in the presence of oxygen, magnesium, and ATP, while luciferase from the sea pansy (Renilla reniformis) acts on coelenterazine in the presence of oxygen. Dual-reporter assays combine Firefly luciferase and Renilla luciferase tests.
What are the advantages of Luciferase as a reporter gene compared to Fluorescent Proteins?
Luciferase sensitivity is 10-100 times higher than GFP, with a wider dynamic range, facilitating numerical analysis and comparison. It does not require a fluorescence microscope. In vivo, its luminescence has better tissue penetration than EGFP and other fluorescent proteins. Furthermore, due to the absence of endogenous activity, its background signal is very low.
The advantages of GFP and other fluorescent proteins compared to luciferase are the ability to perform subcellular localization and that observation does not require cell lysis, allowing for real-time observation.