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在大肠杆菌中ppGpp对转录到DNA修复

Venu Kamarthapu¹, Vitaly Epshtein², Bradley Benjamin²

¹Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY 10016, USA. Howard Hughes Medical Institute, New York University School of Medicine, New York, NY 10016, USA.

Science (New York, N.Y.)

|May 21, 2016

概括

通过影响RNA聚合酶,警报激素 (p) pGpp有助于细菌DNA修复. 这种分子对抗DNA损伤和基因毒剂的细菌生存至关重要.

科学领域:

细菌学
分子生物学
遗传学

背景情况:

通过修改RNA聚合酶 (RNAP) 活性来调节细菌对营养应激的适应.
在大肠杆菌中,ppGpp的合成主要由RelA和SpotT酶进行.

研究的目的:

研究ppGpp在细菌对DNA损伤的反应中的作用.
阐明ppGpp影响DNA修复途径的机制,特别是核酸切除修复 (NER).

主要方法:

在大肠杆菌中诱导ppGpp.
对基因毒剂和紫外线辐射的细菌敏感性的评估.
对RNA聚合酶 (RNAP) 回溯动态的分析.
在ppGpp中介反应中研究UvrD蛋白的参与.

主要成果:

在DNA损伤时,ppGpp是暂时诱导的,对于有效的核酸切除DNA修复 (NER) 是必不可少的.
缺乏RelA和SpotT的细胞对基因毒剂和紫外线辐射具有敏感性,而ppGpp诱导则会产生耐药性.
这种机制有助于DNA的保护.

结论:

通过调节RNAP行为,ppGpp在细菌DNA修复,特别是NER中发挥着关键作用.
ppGpp与DNA修复配对转录的能力在基因毒性压力下提供了生存优势.
ppGpp促进了DNA修复和恢复状态之间的过渡,增强了细菌的弹性.

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