repABC-based replication systems of Rhizobium leguminosarum bv. trifolii TA1 plasmids: Incompatibility and evolutionary analyses

Mazur, Andrzej; Majewska, Bogna; Stasiak, Grażyna; Wielbo, Jerzy; Skorupska, Anna

doi:10.1016/j.plasmid.2011.04.002

Cited by 20 publications

(45 citation statements)

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“…Phylogenetic analysis of repABC sequences enabled the investigation of the history of a plasmid set present in specific rhizobial strains and tracing of subsequent events of plasmid acquisition [25][26][27]. Moreover, some of the rhizobial plasmids are unique in that they cannot be eliminated from the genome, due to the presence of genes participating in the primary metabolism, and they are sometimes regarded as `secondary chromosomes` [28].…”

Section: Rhizobial Genomes -A Scheme For Extraordinary Strain Diversitymentioning

confidence: 99%

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Wielbo

2012

Open Life Sciences

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AbstractThe term ‘Rhizobium-legume symbiosis’ refers to numerous plant-bacterial interrelationships. Typically, from an evolutionary perspective, these symbioses can be considered as species-to-species interactions, however, such plant-bacterial symbiosis may also be viewed as a low-scale environmental interplay between individual plants and the local microbial population. Rhizobium-legume interactions are therefore highly important in terms of microbial diversity and environmental adaptation thereby shaping the evolution of plant-bacterial symbiotic systems. Herein, the mechanisms underlying and modulating the diversity of rhizobial populations are presented. The roles of several factors impacting successful persistence of strains in rhizobial populations are discussed, shedding light on the complexity of rhizobial-legume interactions.

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Section: Rhizobial Genomes -A Scheme For Extraordinary Strain Diversitymentioning

confidence: 99%

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Wielbo

2012

Open Life Sciences

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“…In both cases, one of them is located upstream of repA and the other within repB and in the repB-repC intergenic region, respectively. In turn, no such elements were detected in the proximity of repABC in pRleTA1d and pRleTA1a [30]. However, it is known that only one or at least one par-site located near or within the repABC operon is needed for normal operon activity and adequate plasmid partitioning [20].…”

Section: Rhizobial Plasmid Maintenance Systemsmentioning

confidence: 99%

“…The secondary structure forming ctRNA is a trans incompatibility factor, modulating RepC levels and thereby the plasmid copy number [28,29]. It was shown that the ctRNA region introduced in trans exerts incompatibility against the parental plasmid [15,18,30].…”

Section: Rhizobial Plasmid Maintenance Systemsmentioning

confidence: 99%

“…Firstly, the maintenance of multiple plasmids in the cell indicates the presence of several incompatibility groups within the repABC plasmid family [19,30,48]. Secondly, phylogenetic analyses of rep regions showed that repABC plasmids coexisting in the same strain most probably arose through separate events of lateral gene transfer, further forcing the appearance of different new incompatibility groups and allowing co-residence of plasmids equipped with the same type of replication/ partition machinery in one bacterial cell [30,48,49]. In regards to the evolution of the repABC operon itself, it was hypothesized that it presumably originated through integration of the ctRNA-repC cassette between the repAB genes and the par-site located immediately downstream of the repB, separating the repAB genes from the parS.…”

Section: Rhizobial Plasmid Maintenance Systemsmentioning

confidence: 99%

“…viciae (Rlv) and trifoli (Rlt) are closely related species differing in their host-specificity but displaying very similar genome organization: a single circular chromosome and several large plasmids. Each of them carries the majority of nod-nif-fix genes on the plasmid, named pSym [17,36,46,47,82], but the pSyms of Rhe, Rlv and Rlt belong to different incompatibility groups and have quite different genes content other than those related to symbiotic performance [14,30,83]. In contrast to Sme, several major cluster of genes engaged in the biosynthesis of various surface polysaccharides are chromosomal.…”

Section: Rhizobial Plasmids Structure Gene Content and Impact On Bacmentioning

confidence: 99%

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Rhizobial plasmids — replication, structure and biological role

Mazur

Koper

2012

Open Life Sciences

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AbstractSoil bacteria, collectively named rhizobia, can establish mutualistic relationships with legume plants. Rhizobia often have multipartite genome architecture with a chromosome and several extrachromosomal replicons making these bacteria a perfect candidate for plasmid biology studies. Rhizobial plasmids are maintained in the cells using a tightly controlled and uniquely organized replication system. Completion of several rhizobial genome-sequencing projects has changed the view that their genomes are simply composed of the chromosome and cryptic plasmids. The genetic content of plasmids and the presence of some important (or even essential) genes contribute to the capability of environmental adaptation and competitiveness with other bacteria. On the other hand, their mosaic structure results in the plasticity of the genome and demonstrates a complex evolutionary history of plasmids. In this review, a genomic perspective was employed for discussion of several aspects regarding rhizobial plasmids comprising structure, replication, genetic content, and biological role. A special emphasis was placed on current post-genomic knowledge concerning plasmids, which has enriched the view of the entire bacterial genome organization by the discovery of plasmids with a potential chromosome-like role.

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Plasmids impact on rhizobia-legumes symbiosis in diverse environments

Zahran

2017

Symbiosis

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repABC-based replication systems of Rhizobium leguminosarum bv. trifolii TA1 plasmids: Incompatibility and evolutionary analyses

Cited by 20 publications

References 54 publications

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Rhizobial plasmids — replication, structure and biological role

Plasmids impact on rhizobia-legumes symbiosis in diverse environments

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