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• W1763001481 endingPage "2091" @default.
• W1763001481 startingPage "2082" @default.
• W1763001481 abstract "Etoposide, an inhibitor of the breakage-reunion reaction associated with cellular type II DNA topoisomerases, was shown to inhibit plaque formation of vaccinia virus. This drug had a major effect on the segregation of newly replicated DNA concatemers. Gene expression and the initiation and elongation phases of viral DNA replication were essentially unaffected. Pulsed-field gel electrophoresis of viral DNA replicated in the presence of etoposide revealed two major classes of DNA: the mature monomeric linear genome and DNA that failed to enter the gel (the relative proportions depending on the concentrations of drug). Restriction enzyme analysis showed a severe defect in telomere resolution. In addition, slowly migrating restriction fragments were suggestive of a general recombination defect. We have isolated several etoposide-resistant mutants and used marker rescue and DNA sequencing to localize the resistance-causing mutation to the amino terminus of the viral DNA ligase gene. Inactivation of the DNA ligase also resulted in an etoposide-resistant phenotype, but to a lesser extent. The telomere resolution and segregation defects were corrected both in the drug-resistant mutants and in the DNA ligase knockout mutants. Reinsertion of wild-type or mutant DNA ligase in the viral thymidine kinase locus confirmed the role of the viral DNA ligase in conferring sensitivity not only to etoposide but also to another topoisomerase II inhibitor, 4'-(9-acridinylamino) methanesulphon-m-anisidide (mAMSA). The data suggest that the nonessential DNA ligase is involved in telomere resolution, possibly as part of a general recombinase." @default.
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• W1763001481 date "1995-04-01" @default.
• W1763001481 modified "2023-09-23" @default.
• W1763001481 title "An etoposide-induced block in vaccinia virus telomere resolution is dependent on the virus-encoded DNA ligase" @default.
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• W1763001481 doi "https://doi.org/10.1128/jvi.69.4.2082-2091.1995" @default.
• W1763001481 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/188874" @default.
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