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Complete nucleotide sequence of a native plasmid from Brevibacterium linens
Mathew Moore1, Charles Svenson, David Bowling
1School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney 2052, Australia.
Plasmid
|May 3, 2003
Summary
Researchers isolated four novel plasmids from Brevibacterium linens, including the first sequenced native plasmid, pLIM. This discovery aids in developing genetic tools for this industrially important bacterium.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Brevibacterium linens is crucial in the dairy industry and for producing valuable compounds like bacteriocins and carotenoids.
- Developing genetic tools, such as vectors, is essential for improving B. linens strains but is hindered by a lack of available plasmids.
Purpose of the Study:
- To isolate and characterize novel plasmids from Brevibacterium linens.
- To determine the complete nucleotide sequence of a native B. linens plasmid.
- To investigate the replication mechanism of the sequenced plasmid.
Main Methods:
- Isolation of plasmids from B. linens.
- Next-generation sequencing for complete nucleotide sequence determination.
- Bioinformatic analysis to identify genes and regulatory elements.
Main Results:
- Four novel plasmids were isolated from B. linens.
- The complete nucleotide sequence of the cryptic plasmid pLIM (7610 bp) was determined.
- pLIM belongs to a subfamily of theta-replicating ColE2-related plasmids.
- Replication of pLIM appears to be mediated by two replicases, RepA (primase) and RepB (DNA-binding protein), encoded by the repAB operon.
Conclusions:
- The characterization of pLIM provides a foundational tool for genetic manipulation of B. linens.
- Understanding the replication mechanism of pLIM contributes to the broader knowledge of plasmid biology in Gram-positive bacteria.
- The availability of novel plasmids will facilitate strain development for industrial applications of B. linens.