کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9126875 | 1569961 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The radiation responsive promoter of the Deinococcus radiodurans pprA gene
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
ژنتیک
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چکیده انگلیسی
In a previous study, we identified a novel radiation-inducible protein PprA that plays a critical role in the radiation resistance of Deinococcus radiodurans [Narumi, I., Satoh, K., Cui, S., Funayama, T., Kitayama, S., Watanabe, H., 2004. PprA: a novel protein from Deinococcus radiodurans that stimulates DNA ligation. Mol. Microbiol. 54, 278-285.]. Despite the interest in mechanisms underlying radiation responses in D. radiodurans, little is known about the radiation responsive promoter for radiation-inducible proteins. In this study, three transcriptional start points for pprA mRNA were identified by primer extension analysis, located at positions â 156, â 154 and â 22 upstream from the pprA translation initiation site. The amount of the three extended products increased in cells exposed to 2 kGy followed by a 0.5-h post-incubation. This suggested the existence of at least two radiation responsive promoters for pprA expression. Functional characterization of the upstream region of the pprA gene using a luciferase reporter assay revealed that the distal promoter is located between positions â 208 and â 156 from the translation initiation site, while the proximal promoter is located between positions â 57 and â 22. The region located between positions â 57 and â 38 was indispensable for proximal promoter activity. Site-directed mutagenesis of a thymine positioned at â 33 resulted in severe impairment of promoter activity, and suggested that the thymine functions as a master base for the proximal radiation responsive promoter. The product of the D. radiodurans pprI gene is thought to be a general switch in the radiation response [Hua, Y., Narumi, I., Gao, G., Tian, B., Satoh, K., Kitayama, S., Shen, B., 2003. PprI: a general switch responsible for extreme radioresistance of Deinococcus radiodurans. Biochem. Biophys. Res. Commun. 306, 354-360.]. We examined the effect of pprI disruption on pprA promoter activity. The results suggested that up-regulation of pprA expression by the pprI gene product is triggered at the promoter level.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Gene - Volume 363, 19 December 2005, Pages 133-141
Journal: Gene - Volume 363, 19 December 2005, Pages 133-141
نویسندگان
Hirofumi Ohba, Katsuya Satoh, Tadashi Yanagisawa, Issay Narumi,