Cdc45-MCM-GINS, a new power player for DNA replication.

Cdc45-MCM-GINS, a new power player for DNA replication.
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CDC45-MCM-GINS,是DNA复制的新功率播放器。

DOI:
10.1186/1747-1028-1-18
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发表时间:
2006-08-24
期刊:
影响因子:
2.3
通讯作者:
Méndez J
Méndez J
中科院分区:
生物学3区
文献类型:
--
作者:
Aparicio T;Ibarra A;Méndez J

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参与真核 DNA 复制的 DNA 解旋酶的身份仍然存在争议,但微型染色体维持 (MCM) 蛋白是主要候选者。六种保守的 MCM 蛋白(Mcm2-7)对于 DNA 复制的起始和延伸阶段至关重要,含有 ATP 结合袋,并且可以形成类似于已知原核和病毒解旋酶的六聚体结构。然而,其假定功能的生化证据仍然难以捉摸。最近的几份报告证实,MCM 复合体是负责 S 期 DNA 解旋的细胞机器的一部分。在其中一份报告中,当 Mcm2-7 与两个伙伴(起始因子 Cdc45 和称为 GINS 的四亚基复合物)联合纯化时,Mcm2-7 的解旋酶活性最终被揭示。 Cdc45-MCM-GINS 复合物可以构成更大的大分子结构的核心,该结构被称为“复制体进展复合物”。
The identity of the DNA helicase(s) involved in eukaryotic DNA replication is still a matter of debate, but the mini-chromosome maintenance (MCM) proteins are the chief candidate. Six conserved MCM proteins, Mcm2–7, are essential for the initiation and elongation stages of DNA replication, contain ATP binding pockets and can form a hexameric structure resembling that of known prokaryotic and viral helicases. However, biochemical proof of their presumed function has remained elusive. Several recent reports confirm that the MCM complex is part of the cellular machine responsible for the unwinding of DNA during S phase. In one of these reports, the helicase activity of Mcm2–7 is finally revealed, when they are purified in association with two partners: initiation factor Cdc45 and a four-subunit complex called GINS. The Cdc45-MCM-GINS complex could constitute the core of a larger macromolecular structure that has been termed the "replisome progression complex".
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