RecO Acts with RecF and RecR to Protect and Maintain Replication Forks Blocked by UV-induced DNA Damage in Escherichia coli
In Escherichia coli, recF and recR are required to stabilize and maintain replication forks arrested by UV-induced DNA damage. In the absence of RecF, replication fails to recover, and the nascent lagging strand of the arrested replication fork is extensively degraded by the RecQ helicase and RecJ n...
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Veröffentlicht in: | The Journal of biological chemistry 2004-01, Vol.279 (5), p.3492-3496 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In Escherichia coli, recF and recR are required to stabilize and maintain replication forks arrested by UV-induced DNA damage. In the absence of RecF, replication
fails to recover, and the nascent lagging strand of the arrested replication fork is extensively degraded by the RecQ helicase
and RecJ nuclease. recO mutants are epistatic with recF and recR with respect to recombination and survival assays after DNA damage. In this study, we show that RecO functions with RecF
and RecR to protect the nascent lagging strand of arrested replication forks after UV-irradiation. In the absence of RecO,
the nascent DNA at arrested replication forks is extensively degraded and replication fails to recover. The extent of nascent
DNA degradation is equivalent in single, double, or triple mutants of recF, recO, or recR , and the degradation is dependent upon RecJ and RecQ functions. Because RecF has been shown to protect the nascent lagging
strand from degradation, these observations indicate that RecR and RecO function with RecF to protect the same nascent strand
of the arrested replication fork and are likely to act at a common point during the recovery process. We discuss these results
in relation to the biochemical and cellular properties of RecF, RecO, and RecR and their potential role in loading RecA filaments
to maintain the replication fork structure after the arrest of replication by UV-induced DNA damage. |
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ISSN: | 0021-9258 1083-351X |
DOI: | 10.1074/jbc.M311012200 |