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首页> 外文期刊>Journal of bacteriology >Specific binding of the NikA protein to one arm of 17-base-pair inverted repeat sequences within the oriT region of plasmid R64.
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Specific binding of the NikA protein to one arm of 17-base-pair inverted repeat sequences within the oriT region of plasmid R64.

机译:NikA蛋白与质粒R64 oriT区域内17个碱基对的反向重复序列的一条臂特异性结合。

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摘要

Products of the nikA and nikB genes of plasmid R64 have been shown to form a relaxation complex with R64 oriT DNA and to function together as an oriT-specific nickase. We purified the protein product of the nikA gene. The purified NikA protein bound specifically to the oriT region of R64 DNA. Gel retardation assays and DNase I footprinting analyses indicated that the NikA protein bound only to the right arm of 17-bp inverted repeat sequences; the right arm differed from the left arm by a single nucleotide. The binding site is proximal to the nick site and within the 44-bp oriT core sequence. Binding of the NikA protein induced DNA bending within the R64 oriT sequence.
机译:已显示质粒R64的nikA和nikB基因的产物与R64 oriT DNA形成松弛复合物,并一起作为oriT特异性切口酶起作用。我们纯化了nikA基因的蛋白质产物。纯化的NikA蛋白与R64 DNA的oriT区特异性结合。凝胶阻滞分析和DNase I足迹分析表明,NikA蛋白仅与17 bp反向重复序列的右臂结合;右臂与左臂的区别在于单个核苷酸。结合位点位于切口位点的近端,并在44 bp oriT核心序列内。 NikA蛋白的结合诱导R64 oriT序列内的DNA弯曲。

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