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Nucleic Acids Research, 1988, Vol. 16, No. 24 11431-11440
© 1988

MOLECULAR BIOLOGY

Sequence-specific recognition of the major groove of DNA by oligodeoxynucleotides via triple helix formation. Footprinting studies

Jean-Christophe François, Tula Saison-Behmoaras and Claude Hélène

Laboratoire de Biophysique, Muséum National d'Histoire Naturelle, INSERM U.201, CNRS UA.481 43 rue Cuvier, 75231 Paris Cedex 05, France

Received October 28, 1988. Accepted November 22, 1988.

Homopyrimidine oligodeoxynucleotides recognize the major groove of the DNA double helix at homopurine. homopyrimidine sequences by forming local triple helices. The oligonucleotide is bound parallel to the homopurine strand of the duplex. This binding can be revealed by a footprinting technique using copper-phenanthroline as a cleaving reagent. Oligonucleotide binding in the major groove prevents cleavage by copper-phenanthroline . The cleavage patterns on opposite strands of the duplex at the boundaries of the triple helix are asymmetric. They are shifted to the 3'-side, indicating that the copper-phenanthroline chelate binds in the minor groove of the duplex structure. Binding of the chelate at the junction between the triple and the double helix is not perturbed on the 5'-side of the bound homopyrimidine oligonucleotide. In contrast, a strong enhancement of cleavage is observed on the purine-containing strand at the triplex-duplex junction on the 3'-side of the homopyrimidine oligonucleotide.


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