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Microbial linear plasmids

F Meinhardt1, R Schaffrath, M Larsen

  • 1Institut für Mikrobiologie, Westfälische Wilhelms-Universität, Münster, Germany.

Applied Microbiology and Biotechnology
|April 1, 1997
PubMed
Summary
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Linear plasmids, once thought rare, are common in prokaryotes and eukaryotes. This review explores their biology, ecological roles, and applications in microbiology.

Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Plasmids, initially considered exclusively circular, are now recognized as common linear genetic elements in both prokaryotes and eukaryotes.
  • Linear plasmids exist in two main forms: hairpin plasmids with closed ends and those with proteins attached to their 5' termini.
  • These elements play diverse roles, from evading immune responses in pathogens to conferring advantageous traits like antibiotic production or heavy-metal resistance in bacteria.

Purpose of the Study:

  • To provide a comprehensive overview of the biology of linear plasmids.
  • To discuss the environmental significance and ecological roles of linear plasmids.
  • To highlight the potential applications of linear plasmids in molecular and applied microbiology.

Main Methods:

Related Experiment Videos

  • Literature review and synthesis of existing research on linear plasmids.
  • Comparative analysis of linear plasmid structures and functions across different organisms.
  • Exploration of genetic and molecular mechanisms underlying linear plasmid biology.

Main Results:

  • Linear plasmids are prevalent in diverse organisms, including bacteria (e.g., Borrelia, Actinomycetes), fungi (e.g., Rhizoctonia solani, yeasts), and potentially other eukaryotes.
  • Hairpin plasmids are found in pathogenic Borrelia and fungal mitochondria, while protein-primed linear plasmids are common in bacteria, often conferring beneficial traits.
  • In eukaryotes, linear plasmids are frequently cryptic but can be associated with phenotypes like killer activity in yeasts or senescence/longevity in fungi.

Conclusions:

  • Linear plasmids represent a significant and versatile class of genetic elements with broad biological relevance.
  • Understanding their structure, function, and distribution is crucial for comprehending microbial evolution and ecology.
  • Linear plasmids hold promise as valuable tools for biotechnological applications and genetic engineering.