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. 1997 Feb 1;25(3):559–567. doi: 10.1093/nar/25.3.559

The synthesis and stability of oligodeoxyribonucleotides containing the deoxyadenosine mimic 1-(2'-deoxy-beta-D-ribofuranosyl)imidazole-4-carboxamide.

W T Johnson 1, P Zhang 1, D E Bergstrom 1
PMCID: PMC146467  PMID: 9016596

Abstract

Oligodeoxyribonucleotides containing the nucleoside analog 1-(2'-deoxy-beta-D-ribofuranosyl) imidazole-4-carboxamide (1) were synthesized by solid phase phosphoramidite technology. Nucleoside 1, which contains a reactive exocyclic amide moiety, was incorporated into synthetic oligodeoxyribonucleotides with the use of a benzoyl protecting group. The corresponding oligodeoxyribonucleotides with dI or dA in the same position in the sequence were synthesized for UV comparison of helix-coil transitions. The thermal melting studies indicate that 1, which could conceptually adopt either a dA- or a dI-like hydrogen bond configuration, pairs with significantly higher affinity to T than to dC. Nucleoside 1 further resembles dA in the relative order of its base pairing preferences (T >dG >dA >dC), but may be less discriminating than dA in its bias for base pairing with T over dG.

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Selected References

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