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Phage resistance in lactic acid bacteria.

M E Sanders1

  • 1Biotechnology Products Division, Miles Inc., Elkhart, IN 46515.

Biochimie
|March 1, 1988
PubMed
Summary

Lactic acid bacteria and phage interactions are crucial for commerce. Research explores phage resistance mechanisms, including plasmid-mediated gene transfer for developing resistant starter cultures.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Virology

Background:

  • Interactions between lactic acid bacteria and their phages hold significant commercial importance.
  • Current research emphasizes understanding the genetic basis and mechanisms of phage resistance in these bacteria.

Purpose of the Study:

  • To elucidate the mechanisms and genetics underlying phage resistance in lactic acid bacteria.
  • To investigate the role of plasmid DNA in conferring phage resistance.

Main Methods:

  • Review of existing literature on phage resistance mechanisms.
  • Analysis of genetic links between phage resistance and plasmid DNA in Streptococcus lactis and Streptococcus cremoris.
  • Preliminary investigation of specific resistance mechanisms: prevention of phage adsorption, restriction/modification, and abortive infection.

Main Results:

  • Phage resistance genes in Streptococcus lactis and Streptococcus cremoris are associated with plasmid DNA.
  • Identified potential resistance mechanisms including blocking phage adsorption, restriction/modification systems, and abortive infection.
  • Demonstrated that some phage resistance plasmids are conjugally transferable.

Conclusions:

  • Plasmid DNA plays a key role in mediating phage resistance in lactic acid bacteria.
  • Conjugal transfer of resistance plasmids offers a method for constructing phage-resistant starter cultures.
  • Further research into these mechanisms can enhance the stability and efficiency of industrial fermentation processes.

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