期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 295, 期 50, 页码 17374-17380出版社
ELSEVIER
DOI: 10.1074/jbc.AC120.016325
关键词
nucleotide excision repair; excision repair sequencing (XR-Seq); transcription-coupled repair (TCR); tuberculosis; smegmatis; UvrC; UvrD; Mfd; Mycobacterium tuberculosis; Mycobacterium smegmatis; DNA damage; antibiotic resistance
资金
- National Institutes of Health [GM118102]
In nucleotide excision repair, bulky DNA lesions such as UV-induced cyclobutane pyrimidine dimers are removed from the genome by concerted dual incisions bracketing the lesion, followed by gap filling and ligation. So far, two dual-incision patterns have been discovered: the prokaryotic type, which removes the damage in 11-13-nucleotide-long oligomers, and the eukaryotic type, which removes the damage in 24-32-nucleotide-long oligomers. However, a recent study reported that the UvrC protein of Mycobacterium tuberculosis removes damage in a manner analogous to yeast and humans in a 25-mer oligonucleotide arising from incisions at 15 nt from the 3 ' end and 9 nt from the 5 ' end flanking the damage. To test this model, we used the in vivo excision assay and the excision repair sequencing genome-wide repair mapping method developed in our laboratory to determine the repair pattern and genome-wide repair map of Mycobacterium smegmatis. We find that M. smegmatis, which possesses homologs of the Escherichia coli uvrA, uvrB, and uvrC genes, removes cyclobutane pyrimidine dimers from the genome in a manner identical to the prokaryotic pattern by incising 7 nt 5 ' and 3 or 4 nt 3 ' to the photoproduct, and performs transcription-coupled repair in a manner similar to E. coli.
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