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首页> 外文期刊>Plasmid: An International Journal Devoted to Extrachromosomal Gene Systems >repABC-based replication systems of Rhizobium leguminosarum bv. trifolii TA1 plasmids: incompatibility and evolutionary analyses.
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repABC-based replication systems of Rhizobium leguminosarum bv. trifolii TA1 plasmids: incompatibility and evolutionary analyses.

机译：基于repABC的豆科根瘤菌复制系统。 Trifolii TA1质粒：不相容性和进化分析。

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摘要

Soil bacteria of the genus Rhizobium possess complex genomes consisting of a chromosome and in addition, often, multiple extrachromosomal replicons, which are usually equipped with repABC genes that control their replication and partition. The replication regions of four plasmids of Rhizobium leguminosarum bv. trifolii TA1 (RtTA1) were identified and characterized. They all contained a complete set of repABC genes. The structural diversity of the rep regions of RtTA1 plasmids was demonstrated for parS and incalpha elements, and this was especially apparent in the case of symbiotic plasmid (pSym). Incompatibility assays with recombinant constructs containing parS or incalpha demonstrated that RtTA1 plasmids belong to different incompatibility groups. Horizontal acquisition was plausibly the main contributor to the origin of RtTA1 plasmids and pSym is probably the newest plasmid of this strain. Phylogenetic and incompatibility analyses of repABC regions of three closely related strains: RtTA1, R. leguminosarum bv. viciae 3841 and Rhizobium etli CFN42, provided data on coexistence of their replicons in a common genomic framework.
机译：根瘤菌属的土壤细菌具有复杂的基因组，该基因组由一条染色体组成，此外，通常还具有多个染色体外复制子，这些复制子通常配备有控制其复制和分配的repABC基因。豆科根瘤菌的四个质粒的复制区。三叶TA1（RtTA1）被鉴定和表征。它们都包含一整套repABC基因。 RtTA1质粒的rep区域的结构多样性已针对parS和incalpha元素进行了证明，这在共生质粒（pSym）的情况下尤其明显。用含有parS或incalpha的重组构建体进行的不相容性分析表明RtTA1质粒属于不同的不相容性组。水平采集似乎是RtTA1质粒起源的主要贡献者，而pSym可能是该菌株的最新质粒。三种密切相关的菌株：RtTA1，R。leguminosarum bv。repABC区域的系统发生和不相容性分析。 viciae 3841和Rhizobium etli CFN42提供了有关其复制子在共同基因组框架中共存的数据。

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