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Efficient protoplast regeneration for some homofermentative lactobacilli and pediococci.

O Tanaka1, S Ohmomo

  • 1National Agricultural Research Center for Tohoku Region, Akahira, Shimokuriyagawa, Morioka, Iwate 020-0198, Japan. tanakao@affrc.go.jp

Archives of Microbiology
|January 18, 2002
PubMed
Summary
This summary is machine-generated.

Optimizing protoplast regeneration for lactobacilli and pediococci requires specific colloidal substances in culture media. Tailored media formulations are essential for efficient regeneration across diverse strains, improving bacterial culture techniques.

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Area of Science:

  • Microbiology
  • Bacteriology

Background:

  • Protoplast regeneration is crucial for genetic manipulation of lactic acid bacteria.
  • Existing regeneration media are often ineffective for homofermentative lactobacilli and pediococci.

Purpose of the Study:

  • To investigate optimal conditions for protoplast regeneration in various homofermentative lactobacilli and pediococci strains.
  • To identify effective colloidal substances and media compositions for enhanced protoplast regeneration.

Main Methods:

  • Protoplast isolation from selected lactobacilli and pediococci strains.
  • Testing diverse regeneration media with varying colloidal substances (gelatin, PVP, agarose, calcium alginate) and osmotic stabilizers (raffinose, MgCl2).
  • Evaluating regeneration efficiency across different bacterial species and genera.

Main Results:

  • Standard regeneration media were largely unsuccessful.
  • Replacing or increasing colloidal substances in raffinose/MgCl2-based media significantly improved regeneration frequency (10-99%).
  • Species-specific media requirements were identified: gelatin/PVP for L. plantarum, L. pentosus, L. rhamnosus; PVP agar for Pediococcus sp.; PVP agar with agarose for L. casei; calcium alginate for L. curvatus.

Conclusions:

  • Protoplast regeneration in lactobacilli and pediococci is highly dependent on the type and concentration of colloidal substances.
  • No single medium is universally effective; tailored formulations are necessary for different species.
  • These findings provide optimized protocols for protoplast regeneration, facilitating genetic studies of these important bacteria.