RadD is a RecA-dependent accessory protein that accelerates DNA strand exchange.

RadD is a RecA-dependent accessory protein that accelerates DNA strand exchange.
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DOI:
10.1093/nar/gkac041
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发表时间:
2022-02-28
影响因子:
14.9
通讯作者:
Cox MM
Cox MM
中科院分区:
生物学2区
文献类型:
--
作者:
Bonde NJ;Romero ZJ;Chitteni-Pattu S;Cox MM

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在快速生长的细胞中,由于经常需要重组DNA修复,每20分钟就有一个新的复制叉子经过,RecA介导的DNA链交换的速度对于细菌DNA新陈代谢来说可能太慢了。神秘的RADD蛋白是一个可能的SF2家族解旋酶,在分支DNA上不显示独立的解旋酶活性。相反,RADD极大地加速了RecA介导的DNA链交换,只有在RecA蛋白存在的情况下才起作用。RADD反应需要RADATPase活性,不需要与SSB相互作用,并且可能在发挥作用时分解RecA细丝。我们将RADD作为一类新的酶,一种辅助蛋白,在完全依赖于RecA的反应中加速DNA链交换,可能具有解旋酶样的作用。因此,RADD是一种DNA链交换(重组)增效剂,其主要功能是与RecA重组酶促进的DNA链交换反应密切配合并加速。多项观察表明,RADD与RecA功能具有独特的密切配合。
In rapidly growing cells, with recombinational DNA repair required often and a new replication fork passing every 20 min, the pace of RecA-mediated DNA strand exchange is potentially much too slow for bacterial DNA metabolism. The enigmatic RadD protein, a putative SF2 family helicase, exhibits no independent helicase activity on branched DNAs. Instead, RadD greatly accelerates RecA-mediated DNA strand exchange, functioning only when RecA protein is present. The RadD reaction requires the RadD ATPase activity, does not require an interaction with SSB, and may disassemble RecA filaments as it functions. We present RadD as a new class of enzyme, an accessory protein that accelerates DNA strand exchange, possibly with a helicase-like action, in a reaction that is entirely RecA-dependent. RadD is thus a DNA strand exchange (recombination) synergist whose primary function is to coordinate closely with and accelerate the DNA strand exchange reactions promoted by the RecA recombinase. Multiple observations indicate a uniquely close coordination of RadD with RecA function.
DOI: 10.1038/35003501
发表时间: 2000-03-02
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