Characterization of pBP614, a putative rolling-circle plasmid from Bacillus popilliae
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M Longley1, R MacDonald, T M Poulter
1Department of Biochemistry, University of Otago, Dunedin, New Zealand.
Abstract:
A plasmid, pBP614 (5.647 kb), has been isolated from the New Zealand Bacillus popilliae strain 17 and characterized by physical mapping, cloning, and sequencing. An open reading frame was found which could encode a protein with homology to the replication (Rep) proteins of rolling-circle plasmids. The predicted B. popilliae Rep protein shows closest homology to Rep proteins from Bacillus plasmids of the pC194 family. Sequences homologous to plus- and minus-strand replication origins were found. The minus-strand origin shows similarities to the pal-T type family. Taken together, these observations suggest that pBP614 is a rolling-circle plasmid, the first such plasmid characterized from B. popilliae.
Insights
Researchers identified a novel rolling-circle plasmid, pBP614, in Bacillus popilliae. This discovery provides the first characterization of such a plasmid in this bacterial species, revealing insights into its replication mechanisms.
Area of Science:
- Molecular Biology
- Microbiology
- Genetics
Background:
- Plasmids are extrachromosomal DNA elements crucial for bacterial adaptation and evolution.
- Bacillus popilliae is a bacterium with limited characterized plasmid biology.
- Rolling-circle replication is a common mechanism for plasmid DNA replication in bacteria.
Purpose of the Study:
- To isolate and characterize plasmids from Bacillus popilliae.
- To determine the replication mechanism of the isolated plasmid.
- To identify genes and regulatory elements involved in plasmid maintenance.
Main Methods:
- Plasmid isolation from Bacillus popilliae strain 17.
- Physical mapping, molecular cloning, and DNA sequencing of the plasmid.
- Bioinformatic analysis to identify open reading frames and homologous sequences.
Main Results:
- Isolation and characterization of a 5.647 kb plasmid, designated pBP614.
- Identification of an open reading frame encoding a protein with homology to rolling-circle replication (Rep) proteins.
- Detection of sequences homologous to plus- and minus-strand replication origins, including a minus-strand origin similar to the pal-T type family.
Conclusions:
- The characterized plasmid pBP614 is the first identified rolling-circle type plasmid from Bacillus popilliae.
- The findings suggest pBP614 utilizes a rolling-circle replication mechanism.
- This study expands the understanding of plasmid diversity and replication strategies in Bacillus species.