The Escherichia coli replisome is inherently DNA damage tolerant.

The Escherichia coli replisome is inherently DNA damage tolerant.
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DOI:
10.1126/science.1209111
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发表时间:
2011-10-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Marians KJ
Marians KJ
中科院分区:
其他
文献类型:
--
作者:
Yeeles JT;Marians KJ

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在正常生长条件下,大肠杆菌DNA复制机制必须经常克服模板损伤。然而,复制体和前导链模板损伤之间碰撞的结果仍然知之甚少。在这里,我们证明了一个单一的,位点特异性的,环丁烷嘧啶二聚体先导链模板损伤只提供了一个短暂的阻断体外叉子进展。在与病变发生碰撞后,复制体仍然稳定地与分叉相关。然后,在一个依赖于引物酶DnaG的反应中,在损伤的下游重新启动先导链合成,但与任何已知的复制重启蛋白无关。这些观察结果表明,复制体可以耐受前导链模板损伤,而不会通过不连续地合成前导链来解离。
The Escherichia coli DNA replication machinery must frequently overcome template lesions under normal growth conditions. Yet, the outcome of a collision between the replisome and a leading-strand template lesion remains poorly understood. Here we demonstrate that a single, site-specific, cyclobutane pyrimidine dimer leading-strand template lesion provides only a transient block to fork progression in vitro. The replisome remains stably associated with the fork following collision with the lesion. Leading-strand synthesis is then reinitiated downstream of the damage in a reaction that is dependent on the primase, DnaG, but independent of any of the known replication-restart proteins. These observations reveal that the replisome can tolerate leading-strand template lesions without dissociating by synthesizing the leading strand discontinuously.
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发表时间: 2000-03-02
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影响因子: 64.8
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