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Species and Incompatibility Determination within the P1par Family of Plasmid Partition Elements

机译:P1par家族的质粒分配元件的种类和不相容性测定

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摘要

The P1par family of active plasmid partition systems consists of at least six members, broadly distributed in a variety of plasmid types and bacterial genera. Each encodes two Par proteins and contains a cis-acting parS site. Individual par systems can show distinct species specificities; the proteins from one type cannot function with the parS site of another. P1par-versus-P7par specificity resides within two hexamer BoxB repeats encoded by parS that contact the ParB protein near the carboxy terminus. Here, we examine the species specificity differences between Yersinia pestis pMT1parS and Escherichia coli P1 and P7parS. pMT1parS site specificity could be altered to that of either P1 or P7 by point mutation changes in the BoxB repeats. Just one base change in a single BoxB repeat sometimes sufficed. The BoxB sequence appears to be able to adopt a number of forms that define exclusive interactions with different ParB species. The looped parS structure may facilitate this repertoire of interaction specificities. Different P1par family members have different partition-mediated incompatibility specificities. This property defines whether two related plasmids can coexist in the same cell and is important in promoting the evolution of new plasmid species. BoxB sequence changes that switch species specificity between P1, P7, and pMT1 species switched partition-mediated plasmid incompatibility in concert. Thus, there is a direct mechanistic link between species specificity and partition-mediated incompatibility, and the BoxB-ParB interaction can be regarded as a special mechanism for facilitating plasmid evolution.
机译:P1par活性质粒分配系统家族至少由六个成员组成,广泛分布在各种质粒类型和细菌属中。每个编码两个Par蛋白,并包含一个顺式作用的parS位点。单独的标准杆系统可以显示出不同的物种特异性;一种蛋白质不能与另一种蛋白质的parS位点一起起作用。 P1par对P7par的特异性位于parS编码的两个六聚体BoxB重复序列内,这些重复序列与靠近羧基末端的ParB蛋白接触。在这里,我们检查了鼠疫耶尔森氏菌pMT1parS与大肠杆菌P1和P7parS之间的物种特异性差异。通过BoxB重复序列中的点突变,可以将pMT1parS位点特异性更改为P1或P7。单个BoxB重复中的一个基本更改有时就足够了。 BoxB序列似乎能够采用多种形式来定义与不同ParB物种的排他性相互作用。环状的parS结构可以简化交互特异性的所有功能。不同的P1par家族成员具有不同的分区介导的不相容性特异性。此特性定义了两个相关质粒是否可以在同一细胞中共存,并且在促进新质粒种类的进化中很重要。 BoxB序列变化可在P1,P7和pMT1物种之间切换物种特异性,从而共同协调分配介导的质粒不相容性。因此,物种特异性与分区介导的不相容性之间存在直接的机械联系,而BoxB-ParB相互作用可被视为促进质粒进化的特殊机制。

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