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Science 18 August 1989:
Vol. 245. no. 4919, pp. 725 - 730
DOI: 10.1126/science.2549631
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Articles

Science, Vol 245, Issue 4919, 725-730
Copyright © 1989 by American Association for the Advancement of Science

articles

Inhibition of DNA binding proteins by oligonucleotide-directed triple helix formation

LJ Maher 3rd, B Wold, and PB Dervan

Division of Biology, California Institute of Technology, Pasadena 91125.

Oligonucleotides that bind to duplex DNA in a sequence-specific manner by triple helix formation offer an approach to the experimental manipulation of sequence-specific protein binding. Micromolar concentrations of pyrimidine oligodeoxyribonucleotides are shown to block recognition of double helical DNA by prokaryotic modifying enzymes and a eukaryotic transcription factor at a homopurine target site. Inhibition is sequence-specific. Oligonucleotides containing 5-methylcytosine provide substantially more efficient inhibition than oligonucleotides containing cytosine. The results have implications for gene-specific repression by oligonucleotides or their analogs.


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