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Functional analysis of three plasmids from Lactobacillus plantarum
Richard van Kranenburg1, Natasa Golic, Roger Bongers
1Wageningen Centre for Food Sciences, Wageningen, The Netherlands.
Applied and Environmental Microbiology
|March 5, 2005
Summary
This study characterizes three plasmids in Lactobacillus plantarum WCFS1, detailing their replication mechanisms and host ranges. Plasmid pWCFS103 is conjugative and provides resistance markers for genetic manipulation.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Lactobacillus plantarum WCFS1 possesses three distinct plasmids: pWCFS101 (1,917 bp), pWCFS102 (2,365 bp), and pWCFS103 (36,069 bp).
- The functional roles of the smaller plasmids (pWCFS101, pWCFS102) are currently unknown, though they contain replication genes.
- Plasmid pWCFS103 exhibits conjugative properties and confers heavy metal resistance.
Purpose of the Study:
- To elucidate the replication mechanisms and host ranges of the three plasmids harbored by Lactobacillus plantarum WCFS1.
- To develop novel cloning vectors based on the identified plasmid replicons.
- To explore the potential of pWCFS103 as a conjugative plasmid with selectable markers.
Main Methods:
- Bioinformatic analysis to predict plasmid replication mechanisms (rolling-circle and theta-type).
- Replication studies to determine the host range of each plasmid replicon across different bacterial species.
- Construction and testing of cloning vectors derived from the plasmid replicons.
- Conjugation experiments to demonstrate the transferability of pWCFS103.
Main Results:
- pWCFS101 and pWCFS102 utilize rolling-circle replication with broad host ranges including Lactobacillus, Lactococcus, Carnobacterium, and Bacillus species.
- pWCFS103 replicates via a theta-type mechanism, with its host range primarily restricted to L. plantarum.
- Functional cloning vectors were successfully constructed from all three plasmid replicons.
- pWCFS103 was confirmed as a conjugative plasmid, transferable to other L. plantarum strains, and provides arsenate/arsenite resistance.
Conclusions:
- The three plasmids of L. plantarum WCFS1 possess distinct replication strategies and host ranges, offering diverse tools for genetic engineering.
- The conjugative nature and selectable markers of pWCFS103 make it a valuable tool for bacterial strain improvement and genetic manipulation.
- The developed cloning vectors expand the available genetic tools for research in Lactobacillus and related species.