Abstract
Photoswitchable fluorophores play an essential role in super-resolution fluorescence microscopy, including techniques such as photoactivated localizationmicroscopy (PALM). A determining factor in the precision of the images generated by PALM measurements is the photon numbers that can be detected from the fluorophores. Dronpa is a reversibly photoswitchable fluorescent protein that has been successfully used in PALM experiments. The number of photons per switching cycle that can be acquired for Dronpa depends on its off-switching rate, limiting the number of photons that can be recorded. In this study we report our discovery that the tetrameric ancestor of Dronpa, 22G, shows slower switching, and develop a mutant that displays switching kinetics between those of Dronpa and 22G. We show that the kinetics of the photoswitching are strongly related to self-association of the protein, supporting our view of dynamic flexibility as determining in the photoswitching. Similarly we find that higher-resolution PALM images can be acquired with slower-switching proteins due to their higher number of emitted photons per switching cycle.
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This paper is part of a themed issue on synthetic and natural photoswitches.
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Mizuno, H., Dedecker, P., Ando, R. et al. Higher resolution in localizationmicroscopy by slower switching of a photochromic protein. Photochem Photobiol Sci 9, 239–248 (2010). https://doi.org/10.1039/b9pp00124g
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DOI: https://doi.org/10.1039/b9pp00124g