Direct observation of stalled fork restart via fork regression in the T4 replication system.
Direct observation of stalled fork restart via fork regression in the T4 replication system.
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DOI:
10.1126/science.1225437
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发表时间:
2012-11-30
期刊:
影响因子:
--
通讯作者:
Benkovic SJ
中科院分区:
文献类型:
--
作者:
Manosas M;Perumal SK;Croquette V;Benkovic SJ
The restart of a stalled replication fork is a major challenge for DNA replication. Depending upon the nature of the damage, different repair processes might be triggered; one is template switching that is bypass of a leading strand lesion via fork regression. Using magnetic tweezers to study the T4 bacteriophage enzymes, we have reproduced in vitro the complete process of template switching. We show that the UvsW DNA helicase in cooperation with the T4 holoenzyme can overcome leading strand lesion damage by a pseudo stochastic process periodically forming and migrating a four ways Holliday junction. The initiation of the repair process requires partial replisome disassembly via the departure of the replicative helicase. The results support the role of fork regression pathways in DNA repair.
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