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• W2068157455 startingPage "1589" @default.
• W2068157455 abstract "In dividing cells, the stalling of replication fork complexes by impediments to DNA unwinding or by template imperfections that block synthesis by the polymerase subunits is a serious threat to genomic integrity and cell viability. What happens to stalled forks depends on the nature of the offending obstacle. In UV-irradiated Escherichia coli cells DNA synthesis is delayed for a considerable period, during which forks undergo extensive processing before replication can resume. Thus, restart depends on factors needed to load the replicative helicase, indicating that the replisome may have dissociated. It also requires the RecFOR proteins, which are known to load RecA recombinase on single-stranded DNA, implying that template strands are exposed. To gain a further understanding of how UV irradiation affects replication and how replication resumes after a block, we used fluorescence microscopy and BrdU or radioisotope labelling to examine chromosome replication and cell cycle progression. Our studies confirm that RecFOR promote efficient reactivation of stalled forks and demonstrate that they are also needed for productive replication initiated at the origin, or triggered elsewhere by damage to the DNA. Although delayed, all modes of replication do recover in the absence of these proteins, but nascent DNA strands are degraded more extensively by RecJ exonuclease. However, these strands are also degraded in the presence of RecFOR when restart is blocked by other means, indicating that RecA loading is not sufficient to stabilise and protect the fork. This is consistent with the idea that RecA actively promotes restart. Thus, in contrast to eukaryotic cells, there may be no factor in bacterial cells acting specifically to stabilise stalled forks. Instead, nascent strands may be protected by the simple expedient of promoting restart. We also report that the efficiency of fork reactivation is not affected in polB mutants." @default.
• W2068157455 created "2016-06-24" @default.
• W2068157455 creator A5000430518 @default.
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• W2068157455 creator A5033424893 @default.
• W2068157455 date "2008-09-01" @default.
• W2068157455 modified "2023-10-18" @default.
• W2068157455 title "Maintaining replication fork integrity in UV-irradiated Escherichia coli cells" @default.
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• W2068157455 doi "https://doi.org/10.1016/j.dnarep.2008.06.012" @default.
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