Fluorescent reporter proteins such as green fluorescent protein are valuable noninvasive molecular tools for in vivo real- time imaging of living specimens. However, their use is generally restricted to aerobic systems, as the formation of their chromophores strictly requires oxygen. Starting with blue- light photoreceptors from Bacillus subtilis and Pseudomonas putida that contain light- oxygen- voltage - sensing domains, we engineered flavin mononucleotide - based fluorescent proteins that can be used as fluorescent reporters in both aerobic and anaerobic biological systems.
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