The cell pole: the site of cross talk between the DNA uptake and genetic recombination machinery.

The cell pole: the site of cross talk between the DNA uptake and genetic recombination machinery.
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DOI:
10.3109/10409238.2012.729562
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发表时间:
2012-11
影响因子:
6.5
通讯作者:
Alonso JC
Alonso JC
中科院分区:
生物学2区
文献类型:
--
作者:
Kidane D;Ayora S;Sweasy JB;Graumann PL;Alonso JC

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在杆状细菌中,自然转化是一种程序化机制,其特征是将环境中的游离双链DNA结合到细胞极点上。在枯草芽孢杆菌中,一些功能蛋白处理dsDNA并将单链DNA转移到胞浆中,主要招募一组重组蛋白到细胞的一个极点。单链结合蛋白的一个子集,作为“守护者”,保护单链DNA不被降解,并限制RecA重组酶的载量。然后,“介体”克服监护人的抑制作用,将RecA招募到单链DNA上。一个RecA·ssDNA细丝在染色体上寻找同源性,并在一个由“调节器”控制的过程中,通过产生置换环(D-环)催化链入侵。D-loop解析酶或“解析器”切割这一中间过程,有限的DNA复制恢复丢失的信息,DNA连接酶封存DNA末端。但是,如果任何一步都失败了,这两位“救助者”就会修复断端,挽救染色体转化。如果单链DNA与驻留DNA没有同源性,但它包含自主复制的信息,那么在抑制RecA之后,守护蛋白和介体蛋白就会催化质粒的建立。DNA复制和连接重组了分子(质粒转化)。在这篇综述中,导致蛋白质之间的摄取和基因重组机制的串扰的相互作用的网络将被放在未来。
Natural transformation is a programmed mechanism characterized by binding of free double-stranded (ds) DNA from the environment to the cell pole in rod-shaped bacteria. In Bacillus subtilis some competence proteins, which process the dsDNA and translocate single-stranded (ss) DNA into the cytosol, recruit a set of recombination proteins mainly to one of the cell poles. A subset of single-stranded binding proteins, working as “guardians”, protect ssDNA from degradation and limit the RecA recombinase loading. Then, the “mediators” overcome the inhibitory role of guardians, and recruit RecA onto ssDNA. A RecA·ssDNA filament searches for homology on the chromosome and, in a process that is controlled by “modulators”, catalyzes strand invasion with the generation of a displacement loop (D-loop). A D-loop resolvase or “resolver” cleaves this intermediate, limited DNA replication restores missing information and a DNA ligase seals the DNA ends. However, if any step fails, the “rescuers” will repair the broken end to rescue chromosomal transformation. If the ssDNA does not share homology with resident DNA, but it contains information for autonomous replication, guardian and mediator proteins catalyze plasmid establishment after inhibition of RecA. DNA replication and ligation reconstitute the molecule (plasmid transformation). In this review, the interacting network that leads to a cross talk between proteins of the uptake and genetic recombination machinery will be placed into prospective.
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