The Hrq1 helicase stimulates Pso2 translesion nuclease activity to promote DNA inter-strand crosslink repair
| Autor: | Samuel Parkins, Matthew L. Bochman, Cody M. Rogers, Sabine Wenzel, Yuichiro Takagi, Sua Myong, Chun-Ying Lee, Nicholas J. Buehler, Francisco Martínez-Márquez |
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| Rok vydání: | 2019 |
| Předmět: |
0303 health sciences
Nuclease biology DNA damage Saccharomyces cerevisiae Helicase medicine.disease biology.organism_classification Cell biology 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry Fanconi anemia Transcription (biology) 030220 oncology & carcinogenesis medicine biology.protein Polymerase DNA 030304 developmental biology |
| DOI: | 10.1101/773267 |
| Popis: | DNA inter-strand crosslink (ICL) repair requires a complicated network of DNA damage response pathways. Removal of these lesions is vital as they are physical barriers to essential DNA processes that require the separation of duplex DNA, such as replication and transcription. The Fanconi anemia (FA) pathway is the principle mechanism for ICL repair in metazoans and is coupled to replication. In Saccharomyces cerevisiae, a degenerate FA pathway is present, but ICLs are predominantly repaired by a pathway involving the Pso2 nuclease that is hypothesized to digest through the lesion to provide access for translesion polymerases. However, Pso2 lacks translesion nuclease activity in vitro, and mechanistic details of this pathway are lacking, especially relative to FA. We recently identified the Hrq1 helicase, a homolog of the disease-linked RECQL4, as a novel component of Pso2- mediated ICL repair. Here, we show that Hrq1 stimulates the Pso2 nuclease in a mechanism that requires Hrq1 catalytic activity. Importantly, Hrq1 also stimulates Pso2 translesion nuclease activity through a site- specific ICL in vitro. Stimulation of Pso2 nuclease activity is specific to eukaryotic RecQ4 subfamily helicases, and Hrq1 likely interacts with Pso2 through their N-terminal domains. These results advance our understanding of FA-independent ICL repair and establish a role for the RecQ4 helicases in the repair of these dangerous lesions. |
| Databáze: | OpenAIRE |
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