I came to a fork in the DNA and there was RecG.

I came to a fork in the DNA and there was RecG.
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DOI:
10.1016/j.pbiomolbio.2015.01.001
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发表时间:
2015-03
影响因子:
3.8
通讯作者:
Bianco PR
Bianco PR
中科院分区:
生物学3区
文献类型:
--
作者:
Bianco PR

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RECG是一种有效的、非典型的DNA解旋酶。它同时将ATP水解与双链解离和重绕以及与DNA结合的蛋白质的置换结合在一起。提出了该酶通过与SSB结合定位于内膜的模型。在叉子失速时,SSB将酶定位到叉子上,在那里它可以发挥作用。RecG显示出强烈的倾向于在回归方向上处理叉子,即远离最初导致叉子阻止的损坏位置。回归是由楔形结构域与叉臂以及解旋酶结构域与亲本双链DNA的强烈结合所介导的。一旦RecG退化了叉子,它就会解离,留下现在松弛的、类似Holliday连接的DNA,可供RuvAB等酶进一步处理。
RecG is a potent, atypical, monomeric DNA helicase. It simultaneously couples ATP hydrolysis to duplex unwinding and rewinding, and to the displacement of proteins bound to the DNA. A model is presented for the localization of the enzyme to the inner membrane via its binding to SSB. Upon fork stalling, SSB targets the enzyme to the fork where it can act. RecG displays a strong preference for processing the fork in the regression direction, that is, away from the site of damage that initially led to fork arrest. Regression is mediated by strong binding of the wedge domain to the fork arms as well as to parental duplex DNA by the helicase domains. Once RecG has regressed the fork, it will dissociate leaving the now relaxed, Holliday junction-like DNA, available for further processing by enzymes such as RuvAB.
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发表时间: 2000-03-02
期刊: NATURE
影响因子: 64.8
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