Abstract
The ideal fluorescent probe for bioimaging is bright, absorbs at long wavelengths and can be implemented flexibly in living cells and in vivo. However, the design of synthetic fluorophores that combine all of these properties has proved to be extremely difficult. Here, we introduce a biocompatible near-infrared silicon–rhodamine probe that can be coupled specifically to proteins using different labelling techniques. Importantly, its high permeability and fluorogenic character permit the imaging of proteins in living cells and tissues, and its brightness and photostability make it ideally suited for live-cell super-resolution microscopy. The excellent spectroscopic properties of the probe combined with its ease of use in live-cell applications make it a powerful new tool for bioimaging.
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Acknowledgements
This work was supported by the Swiss National Science Foundation, the Chemical National Centre of Competence in Research Biology, European Research Council grant no. 243016-PALMassembly and the École Polytechnique Fédérale de Lausanne. G.L. was supported by a Federation of European Biochemical Societies long-term fellowship. K.U. was supported by a Grant-in-Aid for Postdoctoral Fellowships for Foreign Researchers Fellows. C.S. is supported by TRR83, and T.P. by the Fonds der Chemischen Industrie. E.A.L. acknowledges funding from the Emmy Noether program of the Deutsche Forschungsgemeinschaft. E.A.L. and C.S. also acknowledge funding from the SPP 1623 of the Deutsche Forschungsgemeinschaft. The authors thank A. Schena, B. Mollwitz and P. Gönczy for sharing reagents and cell lines, S. Hell and S. Jakobs (MPI Göttingen) for excellent support, Tanja Gilat (Max-Planck Institut (MPI) Göttingen) for preparation of the cells and A. Schönle (MPI Göttingen) for support with the software ImSpector.
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All authors planned the experiments and co-wrote the paper. K.U. designed the structure of SiR-carboxyl. K.U., L.R. and I.C. performed the chemical syntheses. G.L., K.U. and L.R. characterized the dyes. G.L., A.H. and V.M. performed the confocal and STED microscopy with subsequent data analysis. N.O. and S.M. performed the GSDIM/STORM imaging and data analysis. T.P., C.S. and E.A.L performed the amber suppression experiments and analysis. G.Y., Z-G.L. and P.H. performed the labelling in brain sections.
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Lukinavičius, G., Umezawa, K., Olivier, N. et al. A near-infrared fluorophore for live-cell super-resolution microscopy of cellular proteins. Nature Chem 5, 132–139 (2013). https://doi.org/10.1038/nchem.1546
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DOI: https://doi.org/10.1038/nchem.1546
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