Abstract
Protein conformation is critically linked to function and often controlled by interactions with regulatory factors. Here we report the selection of camelid-derived single-domain antibodies (nanobodies) that modulate the conformation and spectral properties of the green fluorescent protein (GFP). One nanobody could reversibly reduce GFP fluorescence by a factor of 5, whereas its displacement by a second nanobody caused an increase by a factor of 10. Structural analysis of GFP–nanobody complexes revealed that the two nanobodies induce subtle opposing changes in the chromophore environment, leading to altered absorption properties. Unlike conventional antibodies, the small, stable nanobodies are functional in living cells. Nanobody-induced changes were detected by ratio imaging and used to monitor protein expression and subcellular localization as well as translocation events such as the tamoxifen-induced nuclear localization of estrogen receptor. This work demonstrates that protein conformations can be manipulated and studied with nanobodies in living cells.
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Acknowledgements
A. Kirchhofer acknowledges support from the Deutsche Forschungsgemeinschaftgraduate school 1202. U.R., J.H. and K.S. were supported by the GO-Bio program (Bundesministeriums für Bildung und Forschung) and C.F. by the International Doctorate Program 'NanoBioTechnology' of the Elite Network of Bavaria. The authors thank J. Gregor for excellent technical assistance, K. Lammens for help with crystallographic data collection, R. Lewis for fluorescence lifetimes determination and K. Zolghadr and N. Hiller for helpful comments and suggestions. This work was supported by the Center for Integrated Protein Science (CIPSM), the Center for Nanoscience (CeNS), the Nanosystems Initiative Munich (NIM), the BioImaging Network (BIN) and grants from the Deutsche Forschungsgemeinschaft (DFG) to M.C.C., H.L. and K.-P.H. (SFB 684). A. Kirchhofer and K.-P.H. thank K. Römer and the Dr. Klaus Römer Foundation for financial support.
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U.R., M.C.C. and H.L. conceived and initiated the original project; A. Kirchhofer crystallized the GFP–nanobody complexes, determined the crystal structures, carried out life-time measurements and wrote the manuscript; S.C. and A. Karcher assisted in crystallization and structure determination; K.-P.H. helped with interpreting structural and functional data as well as determining crystal structures, designing research and helped with writing the manuscript; M.P. and S.M. provided the nanobodies; J.H. performed in vitro nanobody binding studies; K.S. carried out nanobody and GFP purification; J.H., C.S.C.-D. and M.C.C. carried out the ratio imaging experiments; C.F. performed the in vivo studies and data analysis; H.L. wrote the manuscript; M.C.C., S.M., H.L. and K.-P.H. revised the manuscript and oversaw research. U.R. carried out nanobody purification, in vitro analysis, translocation assays and wrote the manuscript.
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J.H., K.S., H.L. and U.R. are the founders and shareholders of ChromoTek, which is developing GFP-specific nanobodies for in vitro and in vivo applications.
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Kirchhofer, A., Helma, J., Schmidthals, K. et al. Modulation of protein properties in living cells using nanobodies. Nat Struct Mol Biol 17, 133–138 (2010). https://doi.org/10.1038/nsmb.1727
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DOI: https://doi.org/10.1038/nsmb.1727
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