ArdB Protective Activity for Unmodified λ Phage Against EcoKI Restriction Decreases in UV-Treated Escherichia coli

  • Vladimir P. Balabanov
  • Anna A. KudryavtsevaEmail author
  • Olga E. Melkina
  • Klara S. Pustovoit
  • Svetlana A. Khrulnova
  • Gennadii B. Zavilgelsky
Review Article


Anti-restriction proteins ArdB/KlcA specifically inhibit restriction (endonuclease) activity of restriction-modification (RM) type I systems. Molecular mechanisms of ArdB/KlcA-based anti-restriction remain unknown. In this study, we quantitate effects of ArdB on protection of unmodified λ phage DNA from EcoKI restriction. After UV irradiations, which produce significant amounts of unmodified chromosomal DNA in Escherichia coli K12 cells, the protective activity of ArdB decreases. Unlike ArdB, DNA-mimicking protein Ocr retains its ability to protect the unmodified λ phage regardless of UV dose. We hypothesize that the observed decrease in ArdB protective activity in UV-treated cells is due to its binding to unmodified chromosomal DNA, which decreases effective concentrations of free ArdB molecules available for λ phage protection against type I restriction enzymes.



Russian Foundation for Basic Research 19-04-00495.

Compliance with Ethical Standards

Conflict of interest

Authors declare that thereare no conflicts of interest.


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Vladimir P. Balabanov
    • 1
  • Anna A. Kudryavtseva
    • 2
    Email author
  • Olga E. Melkina
    • 1
  • Klara S. Pustovoit
    • 1
  • Svetlana A. Khrulnova
    • 1
    • 3
  • Gennadii B. Zavilgelsky
    • 1
  1. 1.Laboratory of Genetics of BacteriaState Research Institute of Genetics and Selection of Industrial Microorganisms of the National Research Center “Kurchatov Institute”MoscowRussia
  2. 2.Molecular Genetics LabMoscow Institute of Physics and TechnologyDolgoprudnyRussia
  3. 3.Laboratory of Clinical Bacteriology, Mycology, and Antibiotic TreatmentNational Research Center for HematologyMoscowRussia

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