Abstract
An l-DNA, the mirror-image isomer of natural DNA, has extraordinary nuclease resistance, and thus the molecules should be promising reagents for many applications, such as antisense technology. However, little is known about the structural and thermodynamic properties of DNAs with this modified nucleotide. In this study, we prepared the l-nucleotide (l-DA) and introduced it into oligodeoxyribonucleotides to assess the ability of the l-nucleotide as a functional molecule for many applications based on the DNA hybridization. Two decamers with an l-DA at the center were synthesized and duplexes with the complementary DNA strand were applied to structural and thermodynamic analyses. The structural study by CD spectra showed that the structures of both modified “l/d-d” duplexes were the typical B-form. This result suggests that the global structure of DNa was not collapsed by the introduction of an l-DNA. Thermodynamic parameters (ΔH°, ΔS°, and ΔG°37) of the duplex formation, determined by UV melting experiments, indicated that the both duplexes were destabilized at about 2.5 to 3.0 kcal mol–1 by the introduced L-dA, mainly due to an unfavorable enthalpic effect. In conjunction with information by other researchers, these results suggest that the L-D Na affect on the duplex structure and the stability vary locally; thus, the thermodynamic stability of modified l/d-d duplexes should be predictable by the nearest-neighbor thermodynamic parameters.
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Kawakami, J., Tsujita, K. & Sugimoto, N. Thermodynamic Analysis of Duplex Formation of the Heterochiral DNA with l-Deoxyadenosine. ANAL. SCI. 21, 77–82 (2005). https://doi.org/10.2116/analsci.21.77
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DOI: https://doi.org/10.2116/analsci.21.77