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Chemical ligation of oligonucleotides using an electrophilic phosphorothioester.
Nucleic Acids Research 2017 July 8
We developed a new approach for chemical ligation of oligonucleotides using the electrophilic phosphorothioester (EPT) group. A nucleophilic phosphorothioate group on oligonucleotides was converted into the EPT group by treatment with Sanger's reagent (1-fluoro-2,4-dinitrobenzene). EPT oligonucleotides can be isolated, stored frozen, and used for the ligation reaction. The reaction of the EPT oligonucleotide and an amino-modified oligonucleotide took place without any extra reagents at pH 7.0-8.0 at room temperature, and resulted in a ligation product with a phosphoramidate bond with a 39-85% yield. This method has potential uses in biotechnology and chemical biology.
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