Hydrophilic trans-cyclooctenylated noncanonical amino acids for fast intracellular protein labeling

Abstract Introduction of bioorthogonal functionalities (e.g., trans-cyclooctene-TCO) into a protein of interest by site-specific genetic encoding of non-canonical amino acids (ncAAs) creates uniquely targetable platforms for fluorescent labeling schemes in combination with tetrazine-functionalized d...

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Hauptverfasser: Kozma, Eszter (VerfasserIn) , Nikić, Ivana (VerfasserIn) , Varga, Balázs R. (VerfasserIn) , Aramburu, Iker Valle (VerfasserIn) , Kang, Jun Hee (VerfasserIn) , Fackler, Oliver Till (VerfasserIn) , Lemke, Edward A. (VerfasserIn) , Kele, Péter (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 25 May 2016
In: ChemBioChem
Year: 2016, Jahrgang: 17, Heft: 16, Pages: 1518-1524
ISSN:1439-7633
DOI:10.1002/cbic.201600284
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/cbic.201600284
Verlag, lizenzpflichtig, Volltext: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/cbic.201600284
Volltext
Verfasserangaben:Eszter Kozma, Ivana Nikić, Balázs R. Varga, Iker Valle Aramburu, Jun Hee Kang, Oliver T. Fackler, Edward A. Lemke, and Péter Kele

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520 |a Abstract Introduction of bioorthogonal functionalities (e.g., trans-cyclooctene-TCO) into a protein of interest by site-specific genetic encoding of non-canonical amino acids (ncAAs) creates uniquely targetable platforms for fluorescent labeling schemes in combination with tetrazine-functionalized dyes. However, fluorescent labeling of an intracellular protein is usually compromised by high background, arising from the hydrophobicity of ncAAs; this is typically compensated for by hours-long washout to remove excess ncAAs from the cellular interior. To overcome these problems, we designed, synthesized, and tested new, hydrophilic TCO-ncAAs. One derivative, DOTCO-lysine was genetically incorporated into proteins with good yield. The increased hydrophilicity shortened the excess ncAA washout time from hours to minutes, thus permitting rapid labeling and subsequent fluorescence microscopy. 
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