Establishment of DNA-DNA Interactions by the Cohesin Ring.

Establishment of DNA-DNA Interactions by the Cohesin Ring.
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通过粘着蛋白环建立DNA-DNA相互作用。

DOI:
10.1016/j.cell.2017.12.021
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发表时间:
2018-01-25
期刊:
影响因子:
64.5
通讯作者:
Uhlmann F
Uhlmann F
中科院分区:
生物学1区
文献类型:
--
作者:
Murayama Y;Samora CP;Kurokawa Y;Iwasaki H;Uhlmann F

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The ring-shaped structural maintenance of chromosome (SMC) complexes are multi-subunit ATPases that topologically encircle DNA. SMC rings make vital contributions to numerous chromosomal functions, including mitotic chromosome condensation, sister chromatid cohesion, DNA repair, and transcriptional regulation. They are thought to do so by establishing interactions between more than one DNA. Here, we demonstrate DNA-DNA tethering by the purified fission yeast cohesin complex. DNA-bound cohesin efficiently and topologically captures a second DNA, but only if that is single-stranded DNA (ssDNA). Like initial double-stranded DNA (dsDNA) embrace, second ssDNA capture is ATP-dependent, and it strictly requires the cohesin loader complex. Second-ssDNA capture is relatively labile but is converted into stable dsDNA-dsDNA cohesion through DNA synthesis. Our study illustrates second-DNA capture by an SMC complex and provides a molecular model for the establishment of sister chromatid cohesion. The recombinant cohesin complex mediates DNA-DNA interactions Second-DNA capture by cohesin requires ssDNA DNA replication stabilizes second-strand capture Second-DNA capture at a replication fork could establish sister chromatid cohesion Cohesin sets up the initial steps of chromosome cohesion by anchoring single-stranded DNA along to a region of duplex DNA.
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