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Isolation and characterization of a cryptic plasmid, pMBLR00, from Leuconostoc mesenteroides subsp. mesenteroides
Han Seung Chae1, Jeong Min Lee, Ju-Hoon Lee
1Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea.
Abstract:
A cryptic plasmid, pMBLR00, from Leuconostoc mesenteroides subsp. mesenteroides KCTC 3733 was isolated, characterized, and used for the construction of a cloning vector to engineer Leuconostoc species. pMBLR00 is a rolling circle replication plasmid, containing 3,370 base pairs. Sequence analysis revealed that pMBLR00 has 3 open reading frames: Cop (copy number control protein), Rep (replication protein), and Mob (mobilization protein). pMBLR00 replicates by rolling circle replication, which was confirmed by the presence of a conserved double-stranded origin and single-stranded DNA intermediates. An Escherichia coli-Leuconostoc shuttle vector, pMBLR02, was constructed and was able to replicate in Leuconostoc citreum 95. pMBLR02 could be a useful genetic tool for metabolic engineering and the genetic study of Leuconostoc species.
Insights
A novel cryptic plasmid, pMBLR00, was identified in Leuconostoc mesenteroides and engineered into a shuttle vector, pMBLR02. This vector enables genetic manipulation of Leuconostoc species for research and metabolic engineering applications.
Area of Science:
- Microbiology
- Molecular Biology
- Genetic Engineering
Background:
- Leuconostoc species are important in food fermentation but lack efficient genetic tools.
- Cryptic plasmids can serve as valuable resources for developing genetic engineering systems.
Purpose of the Study:
- To isolate and characterize a cryptic plasmid from Leuconostoc mesenteroides.
- To construct a functional cloning vector for Leuconostoc species.
Main Methods:
- Plasmid isolation and DNA sequencing of pMBLR00.
- Identification of open reading frames (Rep, Cop, Mob).
- Construction and replication testing of the Escherichia coli-Leuconostoc shuttle vector pMBLR02.
Main Results:
- The cryptic plasmid pMBLR00 (3,370 bp) was isolated and characterized.
- pMBLR00 utilizes rolling circle replication, confirmed by sequence analysis and DNA intermediates.
- The constructed shuttle vector pMBLR02 successfully replicated in Leuconostoc citreum 95.
Conclusions:
- pMBLR00 is a rolling circle replication plasmid suitable for vector construction.
- The pMBLR02 shuttle vector is a promising tool for genetic engineering of Leuconostoc.
- This development facilitates further research and metabolic engineering in Leuconostoc species.
