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• W2120429897 abstract "Multicopy plasmids in Escherichia coli are not randomly distributed throughout the cell but exist as defined clusters that are localized at the mid-cell, or at the 1/4 and 3/4 cell length positions. To explore the factors that contribute to plasmid clustering and localization, E. coli cells carrying a plasmid RK2 derivative that can be tagged with a green fluorescent protein-LacI fusion protein were subjected to various conditions that interfere with plasmid superhelicity and/or DNA replication. The various treatments included thymine starvation and the addition of the gyrase inhibitors nalidixic acid and novobiocin. In each case, localization of plasmid clusters at the preferred positions was disrupted but the plasmids remained in clusters, suggesting that normal plasmid superhelicity and DNA synthesis in elongating cells are not required for the clustering of individual plasmid molecules. It was also observed that the inhibition of DNA replication by these treatments produced filaments in which the plasmid clusters were confined to one or two nucleoid bodies, which were located near the midline of the filament and were not evenly spaced throughout the filament, as is found in cells treated with cephalexin. Finally, the enhanced yellow fluorescent protein-RarA fusion protein was used to localize the replication complex in individual E. coli cells. Novobiocin and nalidixic acid treatment both resulted in rapid loss of RarA foci. Under these conditions the RK2 plasmid clusters were not disassembled, suggesting that a completely intact replication complex is not required for plasmid clustering." @default.
• W2120429897 created "2016-06-24" @default.
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• W2120429897 creator A5036198555 @default.
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• W2120429897 date "2005-05-15" @default.
• W2120429897 modified "2023-09-25" @default.
• W2120429897 title "Gyrase Inhibitors and Thymine Starvation Disrupt the Normal Pattern of Plasmid RK2 Localization in Escherichia coli" @default.
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• W2120429897 doi "https://doi.org/10.1128/jb.187.10.3538-3547.2005" @default.
• W2120429897 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1112003" @default.
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