A WD-repeat protein stabilizes ORC binding to chromatin.

A WD-repeat protein stabilizes ORC binding to chromatin.
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DOI:
10.1016/j.molcel.2010.09.021
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发表时间:
2010-10-08
期刊:
影响因子:
16
通讯作者:
Prasanth SG
Prasanth SG
中科院分区:
生物学1区
文献类型:
--
作者:
Shen Z;Sathyan KM;Geng Y;Zheng R;Chakraborty A;Freeman B;Wang F;Prasanth KV;Prasanth SG

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起源识别复合物(origin recognition complex,ORC)在DNA复制启动和细胞周期进程中起重要作用。在后生动物中,ORC在G1期与起源DNA结合,在复制后的细胞中与异染色质结合。然而,什么调节ORC与染色质的结合尚不清楚。我们已经确定了一个高度保守的,富含亮氨酸的重复序列和WD 40重复结构域的蛋白1(LRWD 1)或ORC相关的(ORCA)在人类细胞中与ORC相互作用,并调节染色质协会的ORC。ORCA与ORC共定位,并显示出相似的细胞周期动力学。我们证明,ORCA有效地招募ORC染色质。人原代细胞和胚胎干细胞中ORCA的消耗导致ORC与染色质结合的丧失,伴随着MCM结合的减少,以及随后在G1期的积累。我们的研究结果表明,ORCA介导的协会的ORC染色质是至关重要的启动preRC大会在G1和染色质组织后G1细胞。
Origin recognition complex (ORC) plays critical roles in the initiation of DNA replication and cell-cycle progression. In metazoans, ORC associates with origin DNA during G1 and with heterochromatin in postreplicated cells. However, what regulates the binding of ORC to chromatin is not understood. We have identified a highly conserved, leucine-rich repeats and WD40 repeat domain-containing protein 1 (LRWD1) or ORC-associated (ORCA) in human cells that interacts with ORC and modulates chromatin association of ORC. ORCA colocalizes with ORC and shows similar cell-cycle dynamics. We demonstrate that ORCA efficiently recruits ORC to chromatin. Depletion of ORCA in human primary cells and embryonic stem cells results in loss of ORC association to chromatin, concomitant reduction of MCM binding, and a subsequent accumulation in G1 phase. Our results suggest ORCA-mediated association of ORC to chromatin is critical to initiate preRC assembly in G1 and chromatin organization in post-G1 cells.
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