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Highly conserved DNA sequence present in small plasmids from Selenomonas ruminantium.
K Fliegerova1, S Pazoutova, P Pristas
1Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic, 10-Uhrineves, Prague, 104 00, Czech Republic.
Plasmid
|June 30, 2000
Summary
Researchers sequenced the small plasmid pJW1 from Selenomonas ruminantium subsp. lactilytica. This plasmid contains a gene for a replication protein similar to those found in other bacteria, aiding in understanding plasmid stability.
Area of Science:
- Microbiology
- Molecular Biology
- Genomics
Background:
- Plasmids are crucial for bacterial adaptation and evolution.
- Understanding small plasmid replication mechanisms is key to their stability and transfer.
Purpose of the Study:
- To characterize the genetic structure and sequence of the Selenomonas ruminantium plasmid pJW1.
- To identify potential replication genes and regulatory elements within pJW1.
Main Methods:
- Cloning of the plasmid pJW1 into an E. coli vector.
- Complete DNA sequencing of the cloned plasmid.
- Bioinformatic analysis of the nucleotide sequence and predicted protein products.
Main Results:
- Plasmid pJW1 is a small (1410 bp) molecule with a 42.2% GC content.
- A single open reading frame (ORF1) was identified, encoding a putative replication protein homologous to Rep proteins of other bacterial plasmids.
- The sequence contains an AT-rich region and repeat sequences, characteristic of some plasmid replication origins.
Conclusions:
- Plasmid pJW1 possesses a replication protein similar to those in other bacterial plasmids.
- The sequence features suggest a potential mechanism for replication and maintenance of pJW1.
- A conserved DNA segment was identified, indicating potential relatedness among small S. ruminantium plasmids.