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Photoactivatable Fluorophore for Stimulated Emission Depletion (STED) Microscopy and Bioconjugation Technique for Hydrophobic Labels
Author(s) -
Weber Michael,
Khan Taukeer A.,
Patalag Lukas J.,
Bossi Mariano,
Leutenegger Marcel,
Belov Vladimir N.,
Hell Stefan W.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004645
Subject(s) - sted microscopy , fluorophore , stimulated emission , bioconjugation , chemistry , microscopy , fluorescence , two photon excitation microscopy , fluorescence microscope , laser , optics , physics , combinatorial chemistry
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.