RNA polymerase drives ribonucleotide excision DNA repair in E. coli.

RNA polymerase drives ribonucleotide excision DNA repair in E. coli.
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DOI:
10.1016/j.cell.2023.04.029
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发表时间:
2023-05-25
期刊:
影响因子:
64.5
通讯作者:
Nudler, Evgeny
Nudler, Evgeny
中科院分区:
生物学1区
文献类型:
--
作者:
Hao, Zhitai;Gowder, Manjunath;Proshkin, Sergey;Bharati, Binod K.;Epshtein, Vitaly;Svetlov, Vladimir;Shamovsky, Ilya;Nudler, Evgeny

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RNaseHII is the principal enzyme that removes misincorporated ribonucleoside monophosphates (rNMPs) from genomic DNA. Here we present structural, biochemical, and genetic evidence demonstrating that ribonucleotide excision repair (RER) is directly coupled to transcription. Affinity pulldowns and mass-spectrometry-assisted mapping of in cellulo inter-protein crosslinking reveal the majority of RNaseHII molecules interacting with RNA polymerase (RNAP) in E. coli. Cryo-electron microscopy structures of RNaseHII bound to RNAP during elongation, with and without the target rNMP substrate, show specific protein-protein interactions that define the transcription-coupled RER (TC-RER) complex in engaged and unengaged states. The weakening of RNAP-RNaseHII interactions compromises RER in vivo. The structure-functional data support a model where RNaseHII scans DNA in one dimension in search for rNMPs while “riding” the RNAP. We further demonstrate that TC-RER accounts for a significant fraction of repair events, thereby establishing RNAP as a surveillance “vehicle” for detecting the most frequently occurring replication errors.
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