An increase in melting temperature for DNA:DNA duplexes had been observed previously (Zhu et al. Antisense Res. Dev. 3:349-356, 1993) when an oligo(δ)ornithine moiety was covalently appended to a short oligodeoxynucleotide. We now report the analysis of duplex formation by electrophoretic gel shift analysis. In the particular example studied, an increase in Tm of 4°C was found to correspond to about a fivefold increase in binding constant. A similar enhancement by the appended cationic peptide was observed when the target strand was RNA. The use of a competitive assay format for avoidance of adsorptive loss at low concentrations (<10-7 M) of the oligonucleotide-oligo(δ)ornithine conjugate is presented.
|Original language||English (US)|
|Number of pages||6|
|Journal||Antisense and Nucleic Acid Drug Development|
|State||Published - Mar 1996|
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