Enzymatic Synthesis of 7′,5′-Bicyclo-DNA Oligonucleotides

Diafa, Stella; Evéquoz, Damien; Leumann, Christian; Hollenstein, Marcel (2017). Enzymatic Synthesis of 7′,5′-Bicyclo-DNA Oligonucleotides. Chemistry - an Asian journal, 12(12), pp. 1347-1352. Asian Chemical Editorial Society 10.1002/asia.201700374

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The selection of artificial genetic polymers with tailor-made properties for their application in synthetic biology requires the exploration of new nucleosidic scaffolds that can be used in selection experiments. Herein, we describe the synthesis of a bicyclo-DNA triphosphate (i.e., 7′,5′-bc-TTP) and show its potential to serve for the generation of new xenonucleic acids (XNAs) based on this scaffold. 7′,5′-bc-TTP is a good substrate for Therminator DNA polymerase, and up to seven modified units can be incorporated into a growing DNA chain. In addition, this scaffold sustains XNA-dependent DNA synthesis and potentially also XNA-dependent XNA synthesis. However, DNA-dependent XNA synthesis on longer templates is hampered by competitive misincorporation of deoxyadenosine triphosphate (dATP) caused by the slow rate of incorporation of 7′,5′-bc-TTP.

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