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• W2017776301 abstract "The degradation of host DNA, and the block to transcription of cytosine-containing DNA, which are a part of the normal course of infection by bacteriophage T4, can be eliminated in an appropriate T4 genetic background (designated as our reference type, or r.t.), so that T4 late promoters carried on plasmid DNA can function. The changes of topoisomer distribution that ensue when phage T4 r.t. infect Escherichia coli carrying a plasmid containing a T4 late promoter were analyzed. The linking number of the covalently closed circular plasmid DNA increased (implying relaxation) at the same time as the distribution of topoisomers became much broader. The relaxation of plasmid DNA was primarily, but not exclusively, due to T4 DNA topoisomerase II. The bacterial DNA topoisomerase II (gyrase) continued to function after phage infection to maintain some degree of superhelicity in plasmid DNA. When the DNA gyrase was inhibited by coumermycin or oxolinic acid, the topoisomer distribution became distinctly bimodal, part of the DNA remaining highly negatively supercoiled. It is argued that the observed post-infection topological changes involve relaxation of torsional stress and changes of binding by proteins that topologically constrain the plasmid DNA." @default.
• W2017776301 created "2016-06-24" @default.
• W2017776301 creator A5046085690 @default.
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• W2017776301 date "1986-08-01" @default.
• W2017776301 modified "2023-09-27" @default.
• W2017776301 title "Topoisomerization of plasmid DNA in Escherichia coli infected with bacteriophage T4" @default.
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• W2017776301 doi "https://doi.org/10.1016/0022-2836(86)90005-7" @default.
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