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Nucleic Acids Research, Vol 25, Issue 9 1782-1787, Copyright © 1997 by Oxford University Press

ARTICLES

A physico-chemical study of triple helix formation by an oligodeoxythymidylate with N3'--> P5' phosphoramidate linkages

B Zhou-Sun, J Sun, SM Gryaznov, J Liquier, T Garestier, C Helene and E Taillandier
Laboratoire de Spectroscopie Biomoleculaire, CNRS URA 1430, UFR Sante Medecine Biologie Humaine, Universite Paris-Nord, 74, rue Marcel Cachin, 93017 Bobigny, France.

Non-denaturing gel retardation assay, DNA melting experiments and FTIR spectroscopy were used to characterize the triple helix formed by a 15mer 2'-deoxythymidylate with N3'-->P5'phosphoramidate linkages with its target sequence. The results indicate that: (i) the pentadecadeoxythymidylate with phosphoramidate linkages [dT15(np)] is highly potent to form a triple helix with a dT15*dA15target duplex through Hoogsteenbase-pairing; (ii) it forms a dT15(np)*dA15xdT15(np) triplex with the single-stranded oligo-2'-deoxyadenylate (dA15) without detectable double-helical intermediate; (iii) it does not only form a triple helix on the dT15*dA15target duplex, but also partially displaces the dT15 strand from the dT15*dA15duplex to form a dT15(np)*dA15xdT15(np) complex.
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