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. 1988 Aug 25;16(16):7975–7993. doi: 10.1093/nar/16.16.7975

Enrichment and depletion of Hela topoisomerase I recognition sites among specific types of DNA elements.

C Perez-Stable 1, C C Shen 1, C K Shen 1
PMCID: PMC338504  PMID: 2843808

Abstract

The SDS-induced nicking of DNA helix by Hela topoisomerase I in vitro has been studied by using 2.9 kb of cloned human DNA as the substrate. The frequency of nicking is increased from 1/23 (nick/nt) to 1/19 (nick/nt) when camptothecin is present in the nicking reaction. The cytotoxic drug also induces DNA nicks without the addition of SDS. Although the consensus built from DNA sequences from -20 to +20 of more than one hundred of the nicking sites only shows a preference for T at position -1, the distributions of the topoisomerae I-cleavable sites among different categories of specific DNA sequences are apparently non- random. Long stretches of tandem (CA), A, or T residues, and the GC-rich promoter region of alpha 1 globin gene are all refractory to the nicking reaction. However, the nicking frequencies of short direct repeats flanking different Alu type sequences are as high as 1/6 (nick/nt). Finally, several tandemly arranged minirepeats of the form (TxAy)z, that are usually found at the 3' ends of the primate Alu family or Kpnl family repeats, can be cleaved efficiently in a regular pattern by the enzyme. These data are discussed in terms of the mode of recognition of DNA sequences/structures by topoisomerase I, and its possible roles in the nonhomologous insertion of repetitive DNA sequences.

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Selected References

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