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Plasmids in Bacillus stearothermophilus coding for bacteriocinogeny and temperature resistance
1Department of Microbiology, University of Lund, Sweden.
Plasmid
|September 1, 1991
Summary
Thermophilic Bacillus stearothermophilus strains harbor large plasmids. These plasmids confer temperature resistance and bacteriocin production, crucial for survival in high-temperature environments.
Area of Science:
- Microbiology
- Molecular Biology
Background:
- Obligately thermophilic Bacillus stearothermophilus strains are key organisms for studying high-temperature adaptations.
- Plasmids are extrachromosomal DNA elements that can carry genes conferring advantageous traits.
Purpose of the Study:
- To investigate the presence and characteristics of plasmids in Bacillus stearothermophilus.
- To determine the genetic basis for temperature resistance and bacteriocin production in these strains.
Main Methods:
- Agarose gel electrophoresis for plasmid detection and size determination.
- Endonuclease mapping and Southern blot hybridizations for plasmid relatedness.
- Curing experiments and electroporation for functional analysis of plasmids.
Main Results:
- All screened Bacillus stearothermophilus strains contained large plasmids (20-80 Mdal).
- Four major plasmid species (pSE407, pSE409, pSE411, pSE410) were identified and mapped.
- Plasmids pSE407, pSE410, and pSE411 were found to code for temperature resistance.
- Plasmids pSE410 and likely pSE409 code for bacteriocin production and resistance.
Conclusions:
- Plasmids play a significant role in the adaptation of Bacillus stearothermophilus to thermophilic environments.
- Specific plasmids carry genes essential for thermotolerance and antimicrobial compound production.