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. 1985 Feb 25;13(4):1057-72.
doi: 10.1093/nar/13.4.1057.

Drosophila topoisomerase II double-strand DNA cleavage: analysis of DNA sequence homology at the cleavage site

M Sander, T S Hsieh
Free PMC article

Drosophila topoisomerase II double-strand DNA cleavage: analysis of DNA sequence homology at the cleavage site

M Sander et al. Nucleic Acids Res. .
Free PMC article

Abstract

In order to study the sequence specificity of double-strand DNA cleavage by Drosophila topoisomerase II, we have mapped and sequenced 16 strong and 47 weak cleavage sites in the recombinant plasmid p pi 25.1. Analysis of the nucleotide and dinucleotide frequencies in the region near the site of phosphodiester bond breakage revealed a nonrandom distribution. The nucleotide frequencies observed would occur by chance with a probability less than 0.05. The consensus sequence we derived is 5'GT.A/TAY decrease ATT.AT..G 3', where a dot means no preferred nucleotide, Y is for pyrimidine, and the arrow shows the point of bond cleavage. On average, strong sites match the consensus better than weak sites.

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