Structural and functional insights into the activation of the dual incision activity of UvrC, a key player in bacterial NER

Anna Seck, Salvatore De Bonis, Meike Stelter, Mats Ökvist, Müge Senarisoy, Mohammad Rida Hayek, Aline Le Roy, Lydie Martin, Christine Saint-Pierre, Célia M. Silveira, Didier Gasparutto, Smilja Todorovic, Jean Luc Ravanat, Joanna Timmins

Research output: Contribution to journalArticlepeer-review

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Bacterial nucleotide excision repair (NER), mediated by the UvrA, UvrB and UvrC proteins is a multistep, ATP-dependent process, that is responsible for the removal of a very wide range of chemically and structurally diverse DNA lesions. DNA damage removal is performed by UvrC, an enzyme possessing a dual endonuclease activity, capable of incising the DNA on either side of the damaged site to release a short single-stranded DNA fragment containing the lesion. Using biochemical and biophysical approaches, we have probed the oligomeric state, UvrB-and DNA-binding abilities and incision activities of wild-Type and mutant constructs of UvrC from the radiation resistant bacterium, Deinococcus radiodurans. Moreover, by combining the power of new structure prediction algorithms and experimental crystallographic data, we have assembled the first model of a complete UvrC, revealing several unexpected structural motifs and in particular, a central inactive RNase H domain acting as a platform for the surrounding domains. In this configuration, UvrC is maintained in a 'closed' inactive state that needs to undergo a major rearrangement to adopt an 'open' active state capable of performing the dual incision reaction. Taken together, this study provides important insight into the mechanism of recruitment and activation of UvrC during NER.

Original languageEnglish
Pages (from-to)2931-2949
Number of pages19
JournalNucleic Acids Research
Issue number6
Publication statusPublished - 11 Apr 2023


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