Replication initiation at the Escherichia coli chromosomal origin.

Replication initiation at the Escherichia coli chromosomal origin.
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DOI:
10.1016/j.cbpa.2011.07.016
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发表时间:
2011-10
影响因子:
7.8
通讯作者:
Kaguni, Jon M.
Kaguni, Jon M.
中科院分区:
生物学2区
文献类型:
--
作者:
Kaguni, Jon M.

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为了启动DNA复制,DnaA识别并结合大肠杆菌染色体起点(oriC)内的特定序列,然后解开oriC内的一个区域。接下来,DnaA与DnaB解旋酶相互作用,将DnaB-DnaC复合物加载到每个分离的链上。引发酶(DnaG)的引物形成诱导DnaC从DnaB解离,这涉及结合到DnaC的ATP的水解。最近的证据表明,DnaC作为一个检查点,从DNA复制的起始到延伸阶段的过渡。从DnaC释放,DnaB解旋酶解旋亲本双链体DNA,同时与细胞复制酶、DNA聚合酶III全酶和引发酶相互作用,因为它间歇地形成引物,所述引物在复制染色体时被复制酶延伸。
To initiate DNA replication, DnaA recognizes and binds to specific sequences within the Escherichia coli chromosomal origin (oriC), and then unwinds a region within oriC. Next, DnaA interacts with DnaB helicase in loading the DnaB-DnaC complex on each separated strand. Primer formation by primase (DnaG) induces the dissociation of DnaC from DnaB, which involves the hydrolysis of ATP bound to DnaC. Recent evidence indicates that DnaC acts as a checkpoint in the transition from initiation to the elongation stage of DNA replication. Freed from DnaC, DnaB helicase unwinds the parental duplex DNA while interacting the cellular replicase, DNA polymerase III holoenzyme, and primase as it intermittently forms primers that are extended by the replicase in duplicating the chromosome.
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