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中文摘要：
pprI是近来在奇球菌（Deinococcus Radiodurans）中发现的一个极其重要的DNA修复开关基因.本实验利用穿梭质粒pRADZ3将其转入枯草芽孢杆菌（B-1）中稳定表达,并与转化了空白质粒的菌株（B-2）对照,观察了改造后的两种菌株在H2O2氧化压力和紫外线辐照下的存活率.结果表明,在两种情况下B-1菌株存活率明显高于B-2菌株.证明奇球菌pprI基因在枯草芽孢杆菌中的稳定表达能够增强细胞抗氧化与抗紫外辐射能力.
英文摘要：
pprI,a newly identified gene switch responsible for extreme radioresistance of Deinococcus Radiodurans,plays a central regulatory role in multiple DNA damage repair and protection pathways in response to radiation stress.To evaluate whether pprI also functions in the radioresistance in other organisms,we expressed pprI in the Bacillus subtilis（B-1）using the complementation plasmid,pRADZ3-pprI,based on plasmid pRADZ3,and empty plasmid pRADZ3 was transformed to Bacillus subtilis（B-2）compared with Bacillus subtilis（B-1）.The viabilities under H2O2 oxidative stress and ultraviolet irradiation were observed.The results showed that the Bacillus subtilis（B-1）can enhance the viabilities,compared with the Bacillus subtilis（B-2）under the above two cases.It is concluded that the expression of Deinococcus Radiodurans pprI can enhance the antioxidation and antiultraviolet irradiation in Bacillus subtilis.
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