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• W2948598049 abstract "Abstract The E. coli single stranded DNA binding protein (SSB) is essential to viability. It plays key roles in DNA metabolism where it binds to nascent single strands of DNA and to target proteins known as the SSB interactome. There are >2,000 tetramers of SSB per cell with perhaps 100-150 associated with genome at any one time, either at DNA replication forks or at sites of DNA repair. The remaining 1,900 tetramers could constantly diffuse throughout the cytosol or be associated with the inner membrane as observed for other DNA metabolic enzymes such as DnaA and RecA. To visualize SSB directly and to ascertain spatiotemporal changes in tetramer localization in response to DNA damage, SSB-GFP chimeras were visualized using a novel, super-resolution microscope optimized for visualization of prokaryotic cells. Results show that in the absence of DNA damage, SSB localizes to a small number of foci and the excess protein is observed associated with the inner membrane where it binds to the major phospholipids. Within five minutes following DNA damage, the vast majority of SSB disengages from the membrane and is found almost exclusively in the cell interior. Here, it is observed in a large number of foci, in discreet structures or, in diffuse form spread over the genome, thereby enabling repair events. In the process, it may also deliver interactome partners such as RecG or PriA to sites where their repair functions are required." @default.
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• W2948598049 date "2019-06-07" @default.
• W2948598049 modified "2023-09-26" @default.
• W2948598049 title "Super-resolution imaging reveals changes in<i>Escherichia coli</i>SSB localization in response to DNA damage" @default.
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• W2948598049 doi "https://doi.org/10.1101/664532" @default.
• W2948598049 hasPublicationYear "2019" @default.
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