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. 1987 Aug 25;15(16):6315–6329. doi: 10.1093/nar/15.16.6315

Site specificity of bleomycin cleavage in purified and intracellular simian virus 40 DNA.

J E Grimwade, E B Cason, T A Beerman
PMCID: PMC306108  PMID: 2442726

Abstract

The sites of bleomycin-induced cleavage of purified and intracellular simian virus 40 DNA were examined. Breaks in purified DNA were mapped to several discrete sites that were distributed throughout the viral genome, but were not associated with a common genetic element. Double-stranded breaks were made in positions of the first single-stranded nick, and regions of cuts were unaffected by changes in DNA superhelicity. Bleomycin cut intracellular chromosomes at the same sites that were cleaved in purified DNA. These results indicate that SV40 DNA contains DNA secondary structures that are highly preferred sites for BLM cleavage. These conformations appear to be unaffected by nucleoproteins bound to DNA.

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Selected References

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