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. 1988 Feb 11;16(3):1063–1078. doi: 10.1093/nar/16.3.1063

Induction of an abortive and futile DNA repair process in E. coli by the antitumor DNA bifunctional intercalator, ditercalinium: role in polA in death induction.

B Lambert 1, B P Roques 1, J B Le Pecq 1
PMCID: PMC334737  PMID: 2830590

Abstract

Ditercalinium, an antitumor bifunctional intercalator which forms a high affinity reversible complex with DNA, was found to be specifically cytotoxic for polA and lig7 E. coli strains. In the polA strain, the cytotoxic effect of ditercalinium was suppressed by the uvrA mutation. DNA single strand breaks accumulated in presence of ditercalinium at high temperature in lig7 strains but not in polA strains. Ditercalinium caused no DNA synthesis inhibition although it was able to induce SOS functions. It is proposed that the ditercalinium DNA complex because of its non covalent nature acts as a dummy lesion for the UV repair system in E. coli leading to a futile and abortive repair process. Polymerase I appears to be required to prevent the malfunctioning of a DNA repair process triggered by molecules forming non covalent complex with DNA.

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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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