Methyltransferase-directed covalent coupling of fluorophores to DNA

Autor(es)

Lauer, Milena Helmer ; Vranken, Charlotte ; Deen, Jochem ; Frederickx, Wout ; Vanderlinden, Willem ; Wand, Nathaniel ; Leen, Volker ; Gehlen, Marcelo H. ; Hofkens, Johan ; Neely, Robert K.

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL SCIENCE; v. 8, n. 5, p. 3804-3811, MAY 2017.
• Citações Web of Science: 7

Resumo

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)

• Processo FAPESP: 11/08727-1 - Estudo de sondas orgânicas e estratégias de marcação fluorescente de DNA: da fotoquímica básica à microscopia óptica de super-resolução
• Beneficiário: Milena Helmer Lauer
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 13/09965-9 - Estudo de sistemas poliméricos e de sondas fluorescentes por microscopia óptica de super-resolução
• Beneficiário: Milena Helmer Lauer
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto