Journal
JOURNAL OF BACTERIOLOGY
Volume 191, Issue 2, Pages 555-562Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.00216-08
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Funding
- University of Zurich
- Swiss National Science Foundation [BO-3200-68488]
- European Community [CSI_LTB, LSHP-CT-2007-037235]
- Medical Research Council (United Kingdom)
- Medical Research Council [MC_U117532056] Funding Source: researchfish
- MRC [MC_U117532056] Funding Source: UKRI
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In this study, we investigated the role of the nucleotide excision repair (NER) pathway in mycobacterial DNA repair. Mycobacterium smegmatis lacking the NER excinuclease component uvrB or the helicase uvrD1 gene and a double knockout lacking both genes were constructed, and their sensitivities to a series of DNA-damaging agents were analyzed. As anticipated, the mycobacterial NER system was shown to be involved in the processing of bulky DNA adducts and interstrand cross-links. In addition, it could be shown to exert a protective effect against oxidizing and nitrosating agents. Interestingly, inactivation of uvrB and uvrD1 significantly increased marker integration frequencies in gene conversion assays. This implies that in mycobacteria ( which lack the postreplicative mismatch repair system) NER, and particularly the UvrD1 helicase, is involved in the processing of a subset of recombination-associated mismatches.
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