RecA homology search is promoted by mechanical stress along the scanned duplex DNA.

RecA homology search is promoted by mechanical stress along the scanned duplex DNA.
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DOI:
10.1093/nar/gkr855
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发表时间:
2012-02
影响因子:
14.9
通讯作者:
Prentiss M
Prentiss M
中科院分区:
生物学2区
文献类型:
--
作者:
Danilowicz C;Feinstein E;Conover A;Coljee VW;Vlassakis J;Chan YL;Bishop DK;Prentiss M

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RecA-单链 DNA (RecA-ssDNA) 细丝通过快速结合和解除结合双链 DNA (dsDNA) 来搜索基因组的序列同源性,直到找到同源性。我们证明,拉动 dsDNA 分子中两条 DNA 链之一的相对末端(3' 和 5')可以稳定该 dsDNA 与非同源 RecA-ssDNA 丝的通常不稳定的结合,而拉动两个 3'、两个 5' 或所有四个末端则不能。我们认为,dsDNA 中的“输出”链是通过 DNA-蛋白质的强接触来延伸的,而“互补”链是通过连接“互补”链和“输出”链的碱基对上的张力来延伸的。除非存在足够的同源性,否则其组成链上不同程度的张力所产生的应力会导致 dsDNA 快速解绑。
A RecA–single-stranded DNA (RecA–ssDNA) filament searches a genome for sequence homology by rapidly binding and unbinding double-stranded DNA (dsDNA) until homology is found. We demonstrate that pulling on the opposite termini (3′ and 5′) of one of the two DNA strands in a dsDNA molecule stabilizes the normally unstable binding of that dsDNA to non-homologous RecA–ssDNA filaments, whereas pulling on the two 3′, the two 5′, or all four termini does not. We propose that the ‘outgoing’ strand in the dsDNA is extended by strong DNA–protein contacts, whereas the ‘complementary’ strand is extended by the tension on the base pairs that connect the ‘complementary’ strand to the ‘outgoing’ strand. The stress resulting from different levels of tension on its constitutive strands causes rapid dsDNA unbinding unless sufficient homology is present.
DOI: 10.1016/0022-2836(92)90129-8
发表时间: 1992-07-05
影响因子: 5.6
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