Synthesis and Structural Analysis of Oxadiazole Carboxamide Deoxyribonucleoside Analogs |
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Authors: | Olga Adelfinskaya Weidong Wu V Jo Davisson Donald E Bergstrom |
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Institution: | 1. Walther Cancer Institute , Indianapolis, Indiana, USA;2. Department of Medicinal Chemistry and Molecular Pharmacology , Purdue University , West Lafayette, Indiana, USA |
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Abstract: | Two novel C-linked oxadiazole carboxamide nucleosides 5-(2′-deoxy-3′,5′-β-D-erythro-pentofuranosyl)-1,2,4-oxadiazole-5-carboxamide (1) and 5-(2′-deoxy-3′,5′-β-D-erythro-pentofuranosyl)-1,2,4-oxadiazole-3-carboxamide (2) were successfully synthesized and characterized by X-ray crystallography. The crystallographic analysis shows that both unnatural nucleoside analogs 1 and 2 adapt the C2′-endo (“south”) conformation. The orientation of the oxadiazole carboxamide nucleobase moiety was determined as anti (conformer A) and high anti (conformer B) in the case of the nucleoside analog 1 whereas the syn conformation is adapted by the unnatural nucleoside 2. Furthermore, nucleoside analogs 1 and 2 were converted with high efficiency to corresponding nucleoside triphosphates through the combination chemo-enzymatic approach. Oxadiazole carboxamide deoxyribonucleoside analogs represent valuable tools to study DNA polymerase recognition, fidelity of nucleotide incorporation, and extension. |
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Keywords: | Azole carboxamide nucleoside Oxadiazole Nucleoside triphosphate C-Deoxyribonucleoside Crystal structure DNA polymerase |
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