Abstract
IrisFP is a photoactivatable fluorescent protein that combines irreversible photoconversion from a green- to a red-emitting form with reversible photoswitching between a fluorescent and a nonfluorescent state in both forms. Here we introduce a monomeric variant, mIrisFP, and demonstrate how its multiple photoactivation modes can be used for pulse-chase experiments combined with subdiffraction-resolution imaging in living cells by using dual-color photoactivation localization microscopy (PALM).
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Acknowledgements
We thank F. Schmitt for his help with generating the A69V variant of EosFP. The expression vector pmRuby–α-actinin was provided by M.W. Davidson (Florida State University). This work was supported by the Deutsche Forschungsgemeinschaft and the State of Baden-Württemberg through the Center for Functional Nanostructures, by Deutsche Forschungsgemeinschaft grant NI 291/9, Landesstiftung Baden-Württemberg and Fonds der Chemischen Industrie.
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G.U.N. supervised the project in conception and discussion. S.B. and M.K. generated mIrisFP. S.B. carried out biophysical characterization of mIrisFP. F.O. produced fusion constructs, transfected HeLa cells and performed widefield microscopy. J.W. supplied materials. J.F. and P.N.H. collected and analyzed PALM images. S.B., J.F., F.O. and G.U.N. wrote the manuscript.
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Supplementary Text and Figures
Supplementary Figures 1–15 and Supplementary Tables 1–3 (PDF 2585 kb)
Supplementary Video 1
Paxillin-mIrisFP migration in a live HeLa cell. A time sequence of PALM images shows protein migration after pulse labeling. (MOV 971 kb)
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Fuchs, J., Böhme, S., Oswald, F. et al. A photoactivatable marker protein for pulse-chase imaging with superresolution. Nat Methods 7, 627–630 (2010). https://doi.org/10.1038/nmeth.1477
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DOI: https://doi.org/10.1038/nmeth.1477
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