Dynamics of human replication factors in the elongation phase of DNA replication.

Dynamics of human replication factors in the elongation phase of DNA replication.
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DOI:
10.1093/nar/gkm822
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发表时间:
2007
影响因子:
14.9
通讯作者:
Kamiya K
Kamiya K
中科院分区:
生物学2区
文献类型:
--
作者:
Masuda Y;Suzuki M;Piao J;Gu Y;Tsurimoto T;Kamiya K

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在真核细胞中,DNA复制是由DNA聚合酶δ(pol δ)、复制因子C(RFC)、增殖细胞核抗原(PCNA)和复制蛋白A等多种蛋白协同作用完成的。在这里,我们描述了这些蛋白质在单链M13模板上的延伸步骤中的动态特性,提供了证据表明,pol δ在M13模板的7 kb上具有分布性,在不断增长的3′-羟基末端重复频繁的解离-缔合循环。在此循环期间,一些PCNA可能保留在引物末端,而其余的则从引物末端滑出或一旦pol δ解离就被卸载。RFC在整个延伸期都保留在引物末端,可能会保留pol δ已脱离的PCNA,或从溶液中重新装载PCNA以重新启动DNA合成。此外,我们认为pol δ的一个亚基POLD 3在pol δ的解离-结合周期中对PCNA的有效再循环起着至关重要的作用。基于这些观察,我们提出了一个模型的动态过程中的延伸复合物。
In eukaryotic cells, DNA replication is carried out by coordinated actions of many proteins, including DNA polymerase δ (pol δ), replication factor C (RFC), proliferating cell nuclear antigen (PCNA) and replication protein A. Here we describe dynamic properties of these proteins in the elongation step on a single-stranded M13 template, providing evidence that pol δ has a distributive nature over the 7 kb of the M13 template, repeating a frequent dissociation–association cycle at growing 3′-hydroxyl ends. Some PCNA could remain at the primer terminus during this cycle, while the remainder slides out of the primer terminus or is unloaded once pol δ has dissociated. RFC remains around the primer terminus through the elongation phase, and could probably hold PCNA from which pol δ has detached, or reload PCNA from solution to restart DNA synthesis. Furthermore, we suggest that a subunit of pol δ, POLD3, plays a crucial role in the efficient recycling of PCNA during dissociation–association cycles of pol δ. Based on these observations, we propose a model for dynamic processes in elongation complexes.
DOI: 10.1073/pnas.93.23.12896
发表时间: 1996-11-12
影响因子: 11.1
作者:
Cai, JS;Uhlmann, F;Hurwitz, J
通讯作者: Hurwitz, J
DOI: 10.1038/326515a0
发表时间: 1987-04-02
期刊: NATURE
影响因子: 64.8
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发表时间: 2002-09-27
影响因子: 4.8
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DOI: 10.1021/bi9530649
发表时间: 1996-06-25
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
McConnell, M;Miller, H;Fisher, PA
通讯作者: Fisher, PA