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. 1985 Apr;27(4):460–467. doi: 10.1128/aac.27.4.460

Quantitative measurement of single- and double-strand breakage of DNA in Escherichia coli by the antitumor antibiotics bleomycin and talisomycin.

C K Mirabelli, C H Huang, R G Fenwick, S T Crooke
PMCID: PMC180075  PMID: 2408562

Abstract

We developed an assay in which single-strand breakage (ssb) and double-strand breakage (dsb) of intracellular DNA by chemical agents can be accurately quantitated and differentiated. Escherichia coli cells containing plasmid pBR322 DNA were incubated with the antitumor antibiotics bleomycin A2 (BLM A2) or talisomycin A (TLM A). The plasmid DNA was isolated and then analyzed by electrophoresis on 1% agarose gels to separate the following conformational forms of plasmid DNA: (i) native, covalently closed, super helical, form I; (ii) nicked, relaxed circular, form II; and (iii) double-strand broken, linear, form III. Quantitation by densitometric analysis of the gels showed that BLM A2 and TLM A were equally active in terms of the concentrations of drug necessary to reduce equivalent amounts of form I DNA in the cells, whereas in vitro (using isolated pBR322 DNA as a drug substrate) twofold more TLM A than BLM A2 was required to produce an equivalent amount of reduction in form I DNA. TLM A produced more intracellular dsb than did BLM A2. The intracellular dsb activities (dsb/ssb ratio) measured from BLM A2 and TLM A were equivalent to those measured for the respective agents when isolated pBR322 DNA was used as the substrate. In E. coli both ssb and dsb were repaired, but TLM A damage was repaired more slowly and to a lesser extent, which may reflect the relative frequency of dsb.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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