Photoactivatable Fluorophore for Stimulated Emission Depletion (STED) Microscopy and Bioconjugation Technique for Hydrophobic Labels |
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Authors: | Michael Weber Dr Taukeer A Khan Dr Lukas J Patalag Dr Mariano Bossi Dr Marcel Leutenegger Dr Vladimir N Belov Prof Dr Dr hc mult Stefan W Hell |
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Institution: | 1. Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany;2. Department of Optical Nanoscopy, Max Planck Institute for Medical Research, Jahnstraße 29, 69120 Heidelberg, Germany |
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Abstract: | The use of photoactivatable dyes in STED microscopy has so far been limited by two-photon activation through the STED beam and by the fact that photoactivatable dyes are poorly solvable in water. Herein, we report ONB-2SiR, a fluorophore that can be both photoactivated in the UV and specifically de-excited by STED at 775 nm. Likewise, we introduce a conjugation and purification protocol to effectively label primary and secondary antibodies with moderately water-soluble dyes. Greatly reducing dye aggregation, our technique provides a defined and tunable degree of labeling, and improves the imaging performance of dye conjugates in general. |
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Keywords: | fluorescence optical superresolution photoactivation protein labelling stimulated emission depletion (STED) |
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