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pIGWZ12--A cryptic plasmid with a modular structure.

Piotr Zaleski1, Paweł Wawrzyniak1, Agnieszka Sobolewska1

  • 1Institute of Biotechnology and Antibiotics, Starościńska 5, 02-516 Warsaw, Poland.

Plasmid
|April 19, 2015
PubMed
Summary

The cryptic plasmid pIGWZ12 from Escherichia coli has two modules: REP (replication) and MOB (mobilization). These modules can be separated, showing pIGWZ12

Keywords:
Cryptic plasmidIteronsMOB moduleMobilizationREP module

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Cryptic plasmids, like pIGWZ12 from Escherichia coli, are common but often lack clear function.
  • Understanding plasmid structure and function is crucial for bacterial genetics and biotechnology.
  • Plasmids are extrachromosomal DNA elements that play significant roles in bacterial evolution and adaptation.

Purpose of the Study:

  • To elucidate the detailed structure and functional modules of the cryptic plasmid pIGWZ12.
  • To characterize the replication (REP) and mobilization (MOB) modules of pIGWZ12.
  • To investigate the evolutionary origins and functional independence of pIGWZ12's genetic components.

Main Methods:

  • Genotyping to assign the REP module to the IncF family.
  • Homology analysis to identify the MOB module's relation to MOBQ types.
  • Site-directed mutagenesis to analyze the function of MOB genes (mobA, mobC) and oriT.
  • Protein-DNA binding assays to study RepApIGWZ12 interaction with iterons.
  • Plasmid manipulation (subcloning) to assess module functionality and independence.

Main Results:

  • pIGWZ12 comprises a replication (REP) module of IncF origin and a mobilization (MOB) module homologous to MOBQ.
  • Replication initiator protein RepApIGWZ12 specifically binds to iterons, which also determine incompatibility.
  • Mutagenesis confirmed the roles of mobA, mobC, and oriT in plasmid mobilization.
  • The MOB module can be removed without affecting pIGWZ12 replication or stability.
  • The MOB module retained full functionality upon transfer to another plasmid.

Conclusions:

  • pIGWZ12 exhibits a modular structure with distinct evolutionary origins for its REP and MOB modules.
  • The REP and MOB modules are functionally separable, highlighting modularity in small cryptic plasmids.
  • This modularity offers potential for genetic engineering and biotechnological applications.