Localization of recombination proteins and Srs2 reveals anti-recombinase function in vivo.

Localization of recombination proteins and Srs2 reveals anti-recombinase function in vivo.
复制标题

DOI:
10.1083/jcb.200810055
复制
发表时间:
2009-06-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rothstein R
Rothstein R
中科院分区:
其他
文献类型:
--
作者:
Burgess RC;Lisby M;Altmannova V;Krejci L;Sung P;Rothstein R

文献摘要

参考文献

被引文献

相似文献

同源重组虽然是一种重要的DNA修复机制,但如果调控不当,会对细胞造成危险。Srs2“抗重组酶”通过分解Rad51核蛋白丝(同源DNA链交换前的中间体)来限制HR。在这里,我们从细胞学上表征了Srs2在体内的功能,并描述了一种调节HR起始的新机制。我们发现Srs2分别被招募到复制和修复中心,并确定了招募的遗传要求。在没有Srs2活性的情况下,Rad51病灶积累,并且令人惊讶的是,在没有Rad52介导的情况下也可以形成。然而,这些Rad51病灶并不代表可修复的细丝,这是通过重组试验确定的。在体外也观察到Rad52和Srs2在Rad51丝形成中的拮抗作用。此外,我们提供的证据表明,Srs2不加选择地从DNA中去除Rad51,而Rad52蛋白协调适当的丝重组。这种细丝的持续分解和重建可以作为HR过程中严格的质量控制机制。
Homologous recombination (HR), although an important DNA repair mechanism, is dangerous to the cell if improperly regulated. The Srs2 “anti-recombinase” restricts HR by disassembling the Rad51 nucleoprotein filament, an intermediate preceding the exchange of homologous DNA strands. Here, we cytologically characterize Srs2 function in vivo and describe a novel mechanism for regulating the initiation of HR. We find that Srs2 is recruited separately to replication and repair centers and identify the genetic requirements for recruitment. In the absence of Srs2 activity, Rad51 foci accumulate, and surprisingly, can form in the absence of Rad52 mediation. However, these Rad51 foci do not represent repair-proficient filaments, as determined by recombination assays. Antagonistic roles for Rad52 and Srs2 in Rad51 filament formation are also observed in vitro. Furthermore, we provide evidence that Srs2 removes Rad51 indiscriminately from DNA, while the Rad52 protein coordinates appropriate filament reformation. This constant breakdown and rebuilding of filaments may act as a stringent quality control mechanism during HR.
DOI: 10.1038/nsb901
发表时间: 2003-03-01
期刊: NATURE STRUCTURAL BIOLOGY
影响因子: --
作者:
Alexeev, A;Mazin, A;Kowalczykowski, SC
通讯作者: Kowalczykowski, SC
DOI: 10.1128/mcb.00963-07
发表时间: 2007-11-01
影响因子: 5.3
作者:
Chiolo, Irene;Saponaro, Marco;Liberi, Giordano
通讯作者: Liberi, Giordano
DOI: 10.1128/mcb.00599-06
发表时间: 2006-12-01
影响因子: 5.3
作者:
Fung, Cindy W.;Fortin, Gary S.;Symington, Lorraine S.
通讯作者: Symington, Lorraine S.
DOI: 10.1038/76055
发表时间: 2000-06-01
期刊: NATURE GENETICS
影响因子: 30.8
作者:
Gangloff, S;Soustelle, C;Fabre, F
通讯作者: Fabre, F
DOI: 10.1016/j.dnarep.2006.05.029
发表时间: 2006-09-08
期刊: DNA REPAIR
影响因子: 3.8
作者:
Agarwal, Sheba;Tafel, Agnieszka A.;Kanaar, Roland
通讯作者: Kanaar, Roland