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Plasmid Rolling-Circle Replication
J A Ruiz-Masó1, C MachóN2, L Bordanaba-Ruiseco1
1Centro de Investigaciones Biológicas (CSIC), Ramiro de Maeztu 9, 28040 Madrid, Spain.
Abstract:
Plasmids are DNA entities that undergo controlled replication independent of the chromosomal DNA, a crucial step that guarantees the prevalence of the plasmid in its host. DNA replication has to cope with the incapacity of the DNA polymerases to start de novo DNA synthesis, and different replication mechanisms offer diverse solutions to this problem. Rolling-circle replication (RCR) is a mechanism adopted by certain plasmids, among other genetic elements, that represents one of the simplest initiation strategies, that is, the nicking by a replication initiator protein on one parental strand to generate the primer for leading-strand initiation and a single priming site for lagging-strand synthesis. All RCR plasmid genomes consist of a number of basic elements: leading strand initiation and control, lagging strand origin, phenotypic determinants, and mobilization, generally in that order of frequency. RCR has been mainly characterized in Gram-positive bacterial plasmids, although it has also been described in Gram-negative bacterial or archaeal plasmids. Here we aim to provide an overview of the RCR plasmids' lifestyle, with emphasis on their characteristic traits, promiscuity, stability, utility as vectors, etc. While RCR is one of the best-characterized plasmid replication mechanisms, there are still many questions left unanswered, which will be pointed out along the way in this review.
Insights
Rolling-circle replication (RCR) is a simple plasmid DNA replication strategy. This review explores RCR plasmids
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Plasmids are extrachromosomal DNA elements crucial for bacterial adaptation and evolution.
- Replication initiation is a key challenge in DNA synthesis, as polymerases cannot start de novo.
- Rolling-circle replication (RCR) is an efficient plasmid replication mechanism involving a single initiation site.
Purpose of the Study:
- To provide a comprehensive overview of the lifestyle of RCR plasmids.
- To emphasize characteristic traits, including promiscuity, stability, and utility as vectors.
- To identify unanswered questions regarding RCR plasmid replication and maintenance.
Main Methods:
- Review of existing literature on RCR plasmid replication.
- Analysis of conserved genetic elements in RCR plasmid genomes.
- Comparative study of RCR plasmids across different host domains (bacteria, archaea).
Main Results:
- RCR plasmid genomes typically contain elements for leading/lagging strand initiation, phenotypic determinants, and mobilization.
- RCR is prevalent in Gram-positive bacteria but also found in Gram-negative bacteria and archaea.
- RCR plasmids exhibit diverse lifestyles, varying in host range, stability, and vector applications.
Conclusions:
- RCR represents a fundamental and well-characterized plasmid replication strategy.
- Further research is needed to fully elucidate the complexities of RCR plasmid biology.
- Understanding RCR plasmids is vital for their application in biotechnology and genetic engineering.
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