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- W2516608088 abstract "Photoswitchable fluorescent proteins are capable of changing their spectral properties upon light irradiation, thus allowing one to follow a chosen subpopulation of molecules in a biological system. Recently, we revealed a photoinduced absorption band shift of LSSmOrange, which was originally engineered to have a large energy gap between excitation and emission bands. Here, we evaluated the performance of LSSmOrange as a fluorescent tracer in living cells. The absorption maximum of LSSmOrange in HeLa cells shifted from 437 nm to 553 nm upon illumination with a 405-, 445-, 458-, or 488-nm laser on a laser-scanning microscope, whereas the emission band remained same (∼570 nm). LSSmOrange behaves as a freely diffusing protein in living cells, enabling the use of the protein as a fluorescence tag for studies of protein dynamics. By targeting LSSmOrange in mitochondria, we observed an exchange of soluble molecules between the matrices upon mitochondrial fusion. Since converted and unconverted LSSmOrange proteins have similar emission spectra, this tracer offers unique possibilities for multicolor imaging. The fluorescence emission from LSSmOrange was spectrally distinguishable from that of eYFP and mRFP, and could be separated completely by applying linear unmixing. Furthermore, by using a femtosecond laser at 850 nm, we showed that a two-photon process could evoke a light-induced red shift of the absorption band of LSSmOrange, providing a strict confinement of the conversion volume in a three-dimensional space." @default.
- W2516608088 created "2016-09-16" @default.
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- W2516608088 date "2016-09-01" @default.
- W2516608088 modified "2023-10-16" @default.
- W2516608088 title "Photoconvertible Behavior of LSSmOrange Applicable for Single Emission Band Optical Highlighting" @default.
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- W2516608088 doi "https://doi.org/10.1016/j.bpj.2016.07.033" @default.
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