کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8320306 1539359 2018 38 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-canonical processing of DNA photodimers with Bacillus subtilis UV-endonuclease YwjD, 5′→3′ exonuclease YpcP and low-fidelity DNA polymerases YqjH and YqjW
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Non-canonical processing of DNA photodimers with Bacillus subtilis UV-endonuclease YwjD, 5′→3′ exonuclease YpcP and low-fidelity DNA polymerases YqjH and YqjW
چکیده انگلیسی
It has been shown that mutation frequency decline (Mfd) and nucleotide excision repair (NER) deficiencies promote UV-induced mutagenesis in B. subtilis sporangia. As replication is halted in sporulating B. subtilis cells, in this report, we investigated if this response may result from an error-prone repair event involving the UV-endonuclease YwjD and low fidelity (LF) DNA synthesis. Accordingly, disruption of YwjD generated B. subtilis sporangia that were more susceptible to UV-C radiation than sporangia of the WT strain and such susceptibility increased even more after the single or simultaneous inactivation of the LF DNA polymerases YqjH and YqjW. To further explore this concept, functional His6-tagged YwjD and Y-DNA polymerases YqjH and YqjW were produced and purified to homogeneity. In vitro repair assays showed that YwjD hydrolyzed the phosphodiester bond immediately located 5´-end of a ds-DNA substrate bearing either, cyclobutane pyrimidine dimers (CPD), 6-4 photoproducts (6-4 PD) or Dewar isomers (DWI). Notably, the 6-4 PD and DWI but not the CPDs repair intermediaries of YwjD were efficiently processed by the LF polymerase YqjH suggesting that an additional 5′→3′ exonuclease event was necessary to process PD. Accordingly, the LF polymerase YqjW efficiently processed the incision-excision repair products derived from YwjD and exonuclease YpcP attack over CPD-containing DNA. In summary, our results unveiled a novel non-canonical repair pathway that employs YwjD to incise PD-containing DNA and low fidelity synthesis contributing thus to mutagenesis, survival and spore morphogenesis in B. subtilis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: DNA Repair - Volume 70, October 2018, Pages 1-9
نویسندگان
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