Real-time imaging of DNA loop extrusion by condensin.

Real-time imaging of DNA loop extrusion by condensin.
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DOI:
10.1126/science.aar7831
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发表时间:
2018-04-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Dekker C
Dekker C
中科院分区:
其他
文献类型:
--
作者:
Ganji M;Shaltiel IA;Bisht S;Kim E;Kalichava A;Haering CH;Dekker C

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据推测,染色体结构维持(SMC)蛋白质复合物,如凝聚素和凝聚素空间组织染色体挤压DNA成大环。在这里,我们提供了明确的证据环挤出直接可视化的形成和DNA环的酵母凝聚素在实时进行性延伸。我们发现,一个单一的凝聚素复合物能够挤出数十个DNA的酶对,其速度依赖于力,高达每秒1,500个碱基对,使用ATP水解的能量。凝聚素诱导的环挤出是严格不对称的,这表明凝聚素锚定在DNA上并仅从一侧将其卷入。SMC复合物对DNA环的主动挤出可能为基因组的组织提供了普遍的统一原则。
It has been hypothesized that Structural Maintenance of Chromosomes (SMC) protein complexes such as condensin and cohesin spatially organize chromosomes by extruding DNA into large loops. Here, we provide unambiguous evidence for loop extrusion by directly visualizing the formation and processive extension of DNA loops by yeast condensin in real-time. We find that a single condensin complex is able to extrude tens of kilobase pairs of DNA at a force-dependent speed of up to 1,500 base pairs per second, using the energy of ATP hydrolysis. Condensin-induced loop extrusion is strictly asymmetric, which demonstrates that condensin anchors onto DNA and reels it in from only one side. Active DNA loop extrusion by SMC complexes may provide the universal unifying principle for genome organization.
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发表时间: 2017-12-01
期刊: The EMBO journal
影响因子: --
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