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Ultrabright photoactivatable fluorophores created by reductive caging

Abstract

Sub–diffraction-limit imaging can be achieved by sequential localization of photoactivatable fluorophores, for which the image resolution depends on the number of photons detected per localization. We report a strategy for fluorophore caging that creates photoactivatable probes with high photon yields. Upon photoactivation, these probes can provide 104−106 photons per localization and allow imaging of fixed samples with resolutions of several nanometers. This strategy can be applied to many fluorophores across the visible spectrum.

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Figure 1: Bright photoactivatable dyes created by reductive caging.
Figure 2: STORM images of microtubules in cells stained by indirect immunofluorescence with blue, yellow and red dyes.
Figure 3: STORM image and transverse profile characterization of microtubules polymerized and labeled in vitro with Cy3B.

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Acknowledgements

We thank T. Mitchison, M. Ericsson and W. Wang for help during this project. This work is supported in part by the US National Institutes of Health and a Collaborative Innovation Award from the Howard Hughes Medical Institute (to X.Z.). J.C.V. is supported in part by a Burroughs-Wellcome Career Award at the Scientific Interface. X.Z. is a Howard Hughes Medical Institute investigator.

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Contributions

J.C.V. is primarily responsible for experimental design. J.C.V. and S.J. performed experiments and analysis. X.Z. supervised and guided the project. J.C.V. and X.Z. wrote the manuscript.

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Correspondence to Xiaowei Zhuang.

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The authors declare no competing financial interests.

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Supplementary Figures 1–9, Supplementary Note and Supplementary Protocol (PDF 9669 kb)

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Vaughan, J., Jia, S. & Zhuang, X. Ultrabright photoactivatable fluorophores created by reductive caging. Nat Methods 9, 1181–1184 (2012). https://doi.org/10.1038/nmeth.2214

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