کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9439901 1300516 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The uvrA gene is involved in oxidative and acid stress responses in Lactobacillus helveticus CNBL1156
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی میکروبیولوژی و بیوتکنولوژی کاربردی
پیش نمایش صفحه اول مقاله
The uvrA gene is involved in oxidative and acid stress responses in Lactobacillus helveticus CNBL1156
چکیده انگلیسی
The uvrA gene of Lactobacillus helveticus CNBL1156 coding for subunit A of the excinuclease ABC complex involved in the nucleotide excision repair mechanism was identified. Analysis of the uvrA locus revealed the presence of three open reading frames, merR, sat and uvrA, which coded respectively for a MerR-like regulatory protein, a putative protein with homology to streptothricin acetyl transferase and for a UvrA protein. RNA analysis by northern blotting and RT-PCR showed that sat and uvrA were transcriptionally coupled. UvrA from L. helveticus contained the conserved domains of bacterial excinuclease A, as well as the two ATP binding sites and the zinc binding domains. The transcriptional activity of uvrA indicated that this gene was activated by exposure to UV radiation and oxidative stress. In addition, we observed that the expression of uvrA was inducible by pH; moreover, the role of UvrA in protection against stress was confirmed by acid adaptation experiments. Pretreatment of cells at pH 5 conferred resistance to H2O2, suggesting a specific adaptive response to pH-induced DNA damage. The results from this study indicate that UvrA contributes to acid and oxidative tolerance in L. helveticus, and suggest that it plays a role in survival at low pH under normal conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Research in Microbiology - Volume 156, Issue 10, December 2005, Pages 1039-1047
نویسندگان
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