Journal
CHEMBIOCHEM
Volume 15, Issue 6, Pages 789-793Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.201400037
Keywords
azides; bioorthogonal functional groups; click chemistry; DNA replication; fluorescent probes; metabolic labeling
Funding
- Swiss National Science Foundation [146754]
- University of Zurich Forschungskredit [57131902]
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Metabolic incorporation of azido nucleoside analogues into living cells can enable sensitive detection of DNA replication through copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) and strain-promoted azide-alkyne cycloaddition (SPAAC) click reactions. One major limitation to this approach is the poor chemical stability of nucleoside derivatives containing an aryl azide group. For example, 5-azido-2-deoxyuridine (AdU) exhibits a 4 h half-life in water, and it gives little or no detectable labeling of cellular DNA. In contrast, the benzylic azide 5-(azidomethyl)-2-deoxyuridine (AmdU) is stable in solution at 37 degrees C, and it gives robust labeling of cellular DNA upon addition of fluorescent alkyne derivatives. In addition to providing the first examples of metabolic incorporation into and imaging of azide groups in cellular DNA, these results highlight the general importance of assessing azide group stability in bioorthogonal chemical reporter strategies.
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