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Functional insights into pGI2, a cryptic rolling-circle replicating plasmid from Bacillus thuringiensis.

Lieve Hoflack1, Andrea Wilcks2, Lars Andrup2

  • 1Laboratorium Genetica, Universiteit Gent, K. L. Ledeganckstraat 35, and Plant Genetic Systems, J. Plateaustraat 22, B-9000 Gent, Belgium.

Microbiology (Reading, England)
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This study reveals the modular organization of the Bacillus thuringiensis plasmid pGI2, identifying its replication and mobilization proteins. These findings suggest pGI2 represents a new family of rolling-circle replicating plasmids.

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Area of Science:

  • Bacterial genetics and molecular biology
  • Plasmid biology and replication mechanisms
  • Transposable elements and mobile DNA

Background:

  • Plasmids are extrachromosomal DNA elements crucial for bacterial adaptation and evolution.
  • Understanding plasmid replication and mobilization is key to deciphering their role in horizontal gene transfer.
  • Bacillus thuringiensis plasmids, like pGI2, often carry genes conferring advantageous traits.

Purpose of the Study:

  • To elucidate the functional organization and replication strategy of the Bacillus thuringiensis plasmid pGI2.
  • To characterize the replication (Rep) and mobilization (Mob) proteins of pGI2.
  • To investigate the relationship of pGI2 with other known plasmids and identify potential new plasmid families.

Main Methods:

  • Detailed functional analysis and deletion experiments to identify functional modules.
  • Sequence comparisons and homology searches to identify conserved elements and protein families.
  • Southern hybridization to detect single-stranded DNA intermediates.
  • Conjugation experiments to assess plasmid mobilization capabilities.

Main Results:

  • pGI2 exhibits a modular organization, including a leading-strand replicon and an ssot-like single-strand origin.
  • The replication protein (Rep) of pGI2 is similar to that of pTX14-3, suggesting a new family of rolling-circle replicating (RCR) plasmids.
  • A conserved region downstream of the rep gene is essential for pGI2 replication, likely representing the double-strand origin.
  • pGI2 possesses a mobilization (Mob) protein functional in trans, similar to that of pTX14-3.
  • pGI2 contains the transposon Tn4430 and an ORF related to a protein from Lactococcus lactis.

Conclusions:

  • pGI2 is a rolling-circle replicating plasmid with a modular structure, likely representing a new plasmid family.
  • The identified replication and mobilization proteins are key functional modules of pGI2.
  • pGI2 acts as a reservoir for genetic elements involved in replication, rearrangement, and mobilization within its bacterial host.