期刊
DNA REPAIR
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.dnarep.2022.103316
关键词
Helicases; Lsr2; RNA polymerase; Translocases; UvrB; UvrD2
资金
- Department of Biotechnology (DBT), India
- Ministry of Science and Technology, India
- Jamsetji Tata Trust, India
- DBT Centre of Excellence grant
- DBT-IISc partnership programme, University Grants Commission, New Delhi, India
Cross-talks between DNA repair pathways are crucial for maintaining genomic integrity. In this study, we found that the AP-sites bound by UdgB are not direct substrates for nucleotide excision repair (NER) and that helicases UvrD2 and UvrB facilitate the recycling of UdgB from AP-DNA, exposing the AP-sites for further repair.
Cross-talks between DNA repair pathways are emerging as a crucial strategy in the maintenance of the genomic integrity. A double-stranded (ds) DNA specific DNA glycosylase, UdgB is known to excise uracil, hypoxanthine and ethenocytosine. We earlier showed that Mycobacterium smegmatis (Msm) UdgB stays back on the AP-sites it generates in the DNA upon excision of the damaged bases. Here, we show that in an Msm strain deleted for a nucleotide excision repair (NER) protein, UvrB (uvrB(-)), UdgB expression is toxic, and its deletion from the genome (udgB-) rescues the strain from the genotoxic stress. However, UdgB bound AP-site is not a direct substrate for NER in vitro. We show that UvrD2 and UvrB, known helicases with single-stranded (ss) DNA translocase activity, facilitate recycling of UdgB from AP-DNA. Our studies reveal that the helicases play an important role in exposing the AP-sites in DNA and make them available for further repair.
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