DNA protection by the bacterial ferritin Dps via DNA charge transport.

DNA protection by the bacterial ferritin Dps via DNA charge transport.
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DOI:
10.1021/ja408760w
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发表时间:
2013-10-23
影响因子:
15
通讯作者:
Barton JK
Barton JK
中科院分区:
化学1区
文献类型:
--
作者:
Arnold AR;Barton JK

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Dps蛋白是一种保护DNA免受氧化应激的细菌微铁蛋白,与致病菌的存活和毒力有关。本文研究了大肠杆菌Dps保护DNA的机制,特别是这种DNA结合蛋白是否可以利用DNA电荷通过碱基对π-stack来远距离保护基因组。插入钌光氧化剂被用来产生DNA损伤定位于鸟嘌呤重复序列,DNA中最低电位的位置。我们发现负载亚铁的Dps,与载脂蛋白Dps和含铁的Dps相比,显著降低了氧化DNA损伤的产量。这些数据表明,亚铁负载的Dps被选择性氧化以填充鸟嘌呤自由基孔,从而恢复DNA的完整性。发光研究表明,钌光氧化剂与Dps之间没有直接的相互作用,支持dna介导的亚铁负载Dps的氧化。因此,DNA电荷传输可能是Dps有效保护致病菌基因组的一种机制。
Dps proteins, bacterial mini-ferritins that protect DNA from oxidative stress, are implicated in the survival and virulence of pathogenic bacteria. Here we examine the mechanism of E. coli Dps protection of DNA, specifically whether this DNA-binding protein can utilize DNA charge transport through the base pair π-stack to protect the genome from a distance. An intercalating ruthenium photooxidant was employed to generate DNA damage localized to guanine repeats, the sites of lowest potential in DNA. We find that Dps loaded with ferrous iron, in contrast to Apo-Dps and ferric iron-loaded Dps, significantly attenuates the yield of oxidative DNA damage. These data demonstrate that ferrous iron-loaded Dps is selectively oxidized to fill guanine radical holes, thereby restoring the integrity of the DNA. Luminescence studies indicate no direct interaction between the ruthenium photooxidant and Dps, supporting the DNA-mediated oxidation of ferrous iron-loaded Dps. Thus DNA charge transport may be a mechanism by which Dps efficiently protects the genome of pathogenic bacteria from a distance.
DOI: 10.1073/pnas.0906429106
发表时间: 2009-08-11
影响因子: 11.1
作者:
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DOI: 10.1039/c2cp41602f
发表时间: 2012-01-01
影响因子: 3.3
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期刊: BIOCHEMISTRY
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DOI: 10.1021/ja963606p
发表时间: 1997-03-26
影响因子: 15
作者:
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通讯作者: Barton, JK