Interplay of DNA repair, homologous recombination, and DNA polymerases in resistance to the DNA damaging agent 4-nitroquinoline-1-oxide in Escherichia coli.

Interplay of DNA repair, homologous recombination, and DNA polymerases in resistance to the DNA damaging agent 4-nitroquinoline-1-oxide in Escherichia coli.
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DOI:
10.1016/j.dnarep.2010.07.008
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发表时间:
2010-10-05
期刊:
影响因子:
3.8
通讯作者:
Foster PL
Foster PL
中科院分区:
医学3区
文献类型:
--
作者:
Williams AB;Hetrick KM;Foster PL

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大肠杆菌有三种DNA损伤诱导的DNA聚合酶:DNA聚合酶II(POL II)、DNA聚合酶IV(POL IV)和DNA聚合酶V(POL V)。虽然Pol V在体内的功能已被很好地了解,但Pol IV和Pol II在DNA复制和修复中的确切作用尚不清楚。对这些聚合酶的研究主要集中在它们参与失败复制叉的恢复、跨损伤DNA合成和与来源无关的DNA复制。然而,它们在其他修复和重组途径中的作用还没有得到广泛的研究。本研究研究了大肠杆菌的可诱导DNA聚合酶和各种DNA修复和重组如何共同作用,以传递对4-硝基喹啉-1-氧化物(NQO)的抗性。4-硝基喹啉-1-氧化物(NQO)是一种产生复制阻断DNA碱基加合物的DNA损伤剂。这些数据表明,对这种化合物的完全抗性取决于可诱导的DNA聚合酶和重组活性之间复杂的相互作用。这些数据还表明,处理重组中间体的不同途径之间存在新的关系。
Escherichia coli has three DNA damage-inducible DNA polymerases: DNA polymerase II (Pol II), DNA polymerase IV (Pol IV), and DNA polymerase V (Pol V). While the in vivo function of Pol V is well understood, the precise roles of Pol IV and Pol II in DNA replication and repair are not as clear. Study of these polymerases has largely focused on their participation in the recovery of failed replication forks, translesion DNA synthesis, and origin-independent DNA replication. However, their roles in other repair and recombination pathways in E. coli have not been extensively examined. This study investigated how E. coli’s inducible DNA polymerases and various DNA repair and recombination function together to convey resistance to 4-nitroquinoline-1-oxide (NQO), a DNA damaging agent that produces replication blocking DNA base adducts. The data suggest that full resistance to this compound depends upon an intricate interplay among the activities of the inducible DNA polymerases and recombination. The data also suggest new relationships between the different pathways that process recombination intermediates.
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