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Issue 5, 2017
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Methyltransferase-directed covalent coupling of fluorophores to DNA

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Abstract

We report an assay for determining the number of fluorophores conjugated to single plasmid DNA molecules and apply this to compare the efficiency of fluorophore coupling strategies for covalent DNA labelling. We compare a copper-catalyzed azide–alkyne cycloaddition reaction, amine to N-hydroxysuccinimidyl ester coupling reaction and strain-promoted azide–alkyne cycloaddition reaction for fluorescent DNA labelling. We found increased labelling efficiency going from the amine to N-hydroxysuccinimidyl ester coupling reaction to the copper-catalyzed azide–alkyne cycloaddition and found the highest degree of DNA labelling with the strain-promoted azide–alkyne cycloaddition reaction. We also examined the effect of labelling on the DNA structure using atomic force microscopy. We observe no distortions or damage to the DNA that was labeled using the amine to N-hydroxysuccinimidyl ester and strain-promoted azide–alkyne cycloaddition coupling reactions. This was in contrast to the copper-catalyzed azide–alkyne cycloaddition reaction, which, despite the use of copper-coordinating ligands in the labelling mixture, leads to some structural DNA damage (single-stranded DNA breaks).

Graphical abstract: Methyltransferase-directed covalent coupling of fluorophores to DNA

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Publication details

The article was received on 21 Sep 2016, accepted on 13 Mar 2017 and first published on 14 Mar 2017


Article type: Edge Article
DOI: 10.1039/C6SC04229E
Citation: Chem. Sci., 2017,8, 3804-3811
  • Open access: Creative Commons BY license
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    Methyltransferase-directed covalent coupling of fluorophores to DNA

    M. H. Lauer, C. Vranken, J. Deen, W. Frederickx, W. Vanderlinden, N. Wand, V. Leen, M. H. Gehlen, J. Hofkens and R. K. Neely, Chem. Sci., 2017, 8, 3804
    DOI: 10.1039/C6SC04229E

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