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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Methyltransferase-directed covalent coupling of fluorophores to DNA

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Author(s):
Lauer, Milena Helmer ; Vranken, Charlotte ; Deen, Jochem ; Frederickx, Wout ; Vanderlinden, Willem ; Wand, Nathaniel ; Leen, Volker ; Gehlen, Marcelo H. ; Hofkens, Johan ; Neely, Robert K.
Total Authors: 10
Document type: Journal article
Source: CHEMICAL SCIENCE; v. 8, n. 5, p. 3804-3811, MAY 2017.
Web of Science Citations: 7
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). (AU)

FAPESP's process: 13/09965-9 - Study of polymer systems and organic fluorescent probes by super-resolution optical microscopy
Grantee:Milena Helmer Lauer
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 11/08727-1 - Study of organic probes and strategies of DNA fluorescent labelling: from basic photochemistry to super-resolution optical microscopy
Grantee:Milena Helmer Lauer
Support type: Scholarships in Brazil - Doctorate (Direct)