Morphology and general characteristics of bacteriophages infectious to Robinia pseudoacacia mesorhizobia

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Anna Turska-Szewczuk1, Hubert Pietras, Jarosław Pawelec

  • 1Department of Genetics and Microbiology, Maria Curie-Skłodowska University, 19 Akademicka St, 20-033 Lublin, Poland. aturska@hektor.umcs.lublin.pl

Current Microbiology
|March 6, 2010
PubMed

Insights

Four novel phages targeting Mesorhizobium were isolated from soil. These phages, belonging to the Podoviridae and Siphoviridae families, exhibit specific virulence and distinct receptor interactions, with one phage utilizing LPS as its receptor.

Area of Science:

  • Microbiology
  • Virology
  • Bacteriology

Background:

  • Soil harbors diverse bacteriophages with potential applications in microbial control.
  • Mesorhizobium are important plant-associated bacteria, and understanding their phages is crucial.

Purpose of the Study:

  • To isolate and characterize novel bacteriophages infecting Mesorhizobium strains.
  • To investigate phage morphology, virulence, replication, and receptor interactions.

Main Methods:

  • Isolation of phages from soil samples.
  • Electron microscopy for morphology classification (Podoviridae, Siphoviridae).
  • One-step growth experiments and adsorption rate analysis.
  • Neutralization tests and LPS analysis to identify receptors.
  • Restriction endonuclease digestion for DNA size estimation.

Main Results:

  • Four phages (Mlo30, Mam12, Mam20, Mlo1) were identified, classified into Podoviridae and Siphoviridae families.
  • Phages exhibited specific virulence against Mesorhizobium, not affecting Rhizobium or Bradyrhizobium.
  • Virus yields varied, with Mlo1 producing significantly more particles (100-120) than others (10-25).
  • Receptor analysis indicated thermal sensitivity variations, with LPS identified as the receptor for Mlo30.
  • Phage DNA sizes ranged from approximately 39 kb (group C) to 80 kb (group B2).

Conclusions:

  • The identified phages represent novel tools for targeting Mesorhizobium.
  • Understanding phage-host interactions, including receptor specificity (LPS), is key for phage therapy development.
  • Phage Mlo1 shows higher replication potential, suggesting its utility in specific applications.

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