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. 1987 Aug 11;15(15):6149–6158. doi: 10.1093/nar/15.15.6149

Oligo-[alpha]-deoxynucleotides covalently linked to an intercalating agent. Double helices with parallel strands are formed with complementary oligo-[beta]-deoxynucleotides.

J S Sun, U Asseline, D Rouzaud, T Montenay-Garestier, T T Nguyen, C Hélène
PMCID: PMC306074  PMID: 3627982

Abstract

An oligo-[alpha]-deoxynucleotide of sequence (5')d(TCTAAACTC) (3') was synthesized using the alpha-anomers of deoxynucleosides and its 5'-phosphate was covalently linked to a 9-amino acridine derivative via a pentamethylene linker. Two oligo-[beta]-deoxynucleotides containing the complementary sequence in either the 5'----3' or the 3'----5' orientation were synthesized using natural [beta]-deoxynucleosides. Complex formation was investigated by absorption and fluorescence spectroscopies. No change in spectroscopic properties was detected with the anti-parallel [beta] sequence. Absorption changes were induced in the visible absorption band of the acridine derivative at 2 degrees C when the acridine-substituted oligo-[alpha]-deoxynucleotide was mixed in equimolecular amounts with the complementary [beta]-sequence in the parallel orientation. Hypochromism was observed in the UV range. The fluorescence of the acridine derivative was quenched by the guanine base present in the second position of the complementary sequence. Cooperative dissociation curves were observed and identical values of melting temperatures were obtained by absorption and fluorescence. An increase in salt concentration stabilized the complex with a delta Tm of 8 degrees C when NaCl concentration increased from 0.1 to 1 M. These results demonstrate that an oligo-[alpha]-deoxynucleotide covalently linked to an intercalating agent is able to form a double helix with an oligo-[beta]-deoxynucleotide. The two strands of this [alpha]-[beta] double helix adopt a parallel 5'----3' orientation. The acridine ring is able to intercalate between the first two base pairs on the 5'-side of the duplex structure.

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Selected References

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