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Lactococcal plasmid pNP40 encodes a novel, temperature-sensitive restriction-modification system.

Jonathan O'Driscoll1, Frances Glynn, Oonagh Cahalane

  • 1Department of Microbiology, University College Cork, Western Road, Cork, Ireland.

Applied and Environmental Microbiology
|September 4, 2004
PubMed
Summary
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A novel restriction-modification system, LlaJI, found in Lactococcus lactis provides phage resistance. This system

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacteriophage Research

Background:

  • Lactococcus lactis is a key bacterium in dairy fermentation.
  • Bacteriophage infections pose a significant threat to L. lactis cultures.
  • Restriction-modification (R-M) systems are known to confer phage resistance.

Purpose of the Study:

  • To identify and characterize a novel R-M system in Lactococcus lactis.
  • To investigate the genetic organization and functional properties of the LlaJI system.
  • To determine the role of the LlaJI system in conferring phage resistance.

Main Methods:

  • Plasmid isolation and cloning of the LlaJI system into a vector.
  • Phage resistance assays at different temperatures.
  • Gene expression analysis using Northern blot and promoter-lacZ fusion.

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Main Results:

  • The LlaJI system, comprising four genes (two methylases, two endonucleases), confers resistance to lactococcal phages.
  • Phage resistance is temperature-dependent, optimal at 19°C.
  • Both methylase and endonuclease genes are essential for full activity; the operon is regulated by an unknown pNP40 element.

Conclusions:

  • The novel LlaJI R-M system provides effective, temperature-sensitive phage resistance in L. lactis.
  • The LlaJI system's operon structure and regulation offer insights into R-M system evolution.
  • Understanding LlaJI can aid in developing strategies to protect L. lactis starter cultures.