Preventing re-replication of chromosomal DNA.

Preventing re-replication of chromosomal DNA.
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DOI:
10.1038/nrm1663
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发表时间:
2005-06
期刊:
Nature reviews. Molecular cell biology
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为了确保它的忠实复制,染色体DNA必须在每个细胞周期内精确复制,没有未复制的部分,也没有复制超过一次的部分。真核细胞通过将复制分为两个不重叠的阶段来实现这一点。在有丝分裂后期和G1期,复制起点通过加载McM2-7蛋白形成复制前复合体(Pre-RC)来‘许可’复制。在S阶段,MCM2-7蛋白是启动和延长复制分叉所必需的。最近的数据提供了对复制许可过程的生化和结构洞察,以及在细胞周期中调节复制许可的机制。
To ensure its faithful duplication, chromosomal DNA must be precisely duplicated in each cell cycle, with no sections left unreplicated and no sections replicated more than once. Eukaryotic cells achieve this by dividing replication into two non-overlapping phases. During late mitosis and G1, replication origins are ‘licensed’ for replication by loading the Mcm2-7 proteins to form a pre-replicative complex (pre-RC). Mcm2-7 proteins are then essential for initiating and elongating replication forks during S phase. Recent data have provided biochemical and structural insight into the process of replication licensing, and the mechanisms that regulate it during the cell cycle.
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