Acta Biologica Hungarica

, Volume 67, Issue 1, pp 85–98 | Cite as

The Role of Oxidative Stress Genes and Effect of Ph on Methylene Blue Sensitized Photooxidation of Escherichia Coli

  • Önder İdilEmail author
  • İkbal Macit
  • Özge Kaygusuz
  • Cihan Darcan


In this study, the survival time of wild type E. coli W3110 and 11 mutants was analysed with a plate count method in methylene blue added or control groups under daylight fluoroscence illumination (4950 lux) at different pH values (5.0, 6.0, 7.0, and 8.0) in phosphate buffer. As a result, while the number of bacteria did not decrease under photooxidative stress at pH 5.0 and 6.0 during a 6-hour incubation, the wild type and all mutants decreased more than 2 log. at pH 8.0, and approximately one log. at pH 7.0. It was determined that a 2 log decrease in wild type E. coli takes 3.7 h according to t99 value at pH 8, these values were 2.39 h in the katE mutant, 2.64 h in the soxR mutant, 2.67 h in the oxyR mutant, 2.71 h in the sodB mutant, 3 h in the btuE mutant, 3.38 h in the zwf mutant and 3.40 h in the soxS mutant, respectively (p < 0.05). The roles of these genes were proved with complement tests. Finally, it is found that the effectiveness of photooxidative stress is in direct relation with pH, and the katE, soxR, oxyR, sodB, btuE, zwf, and soxS genes are important for the protection against this stress.


E. coli photooxidation oxyS soxRS katE sodB 


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© Akadémiai Kiadó, Budapest 2016

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Önder İdil
    • 1
    Email author
  • İkbal Macit
    • 2
  • Özge Kaygusuz
    • 3
  • Cihan Darcan
    • 3
  1. 1.Faculty of EducationAmasya UniversityAmasyaTurkey
  2. 2.Department of Biology, Institute of SciencesAmasya UniversityAmasyaTurkey
  3. 3.Department of Molecular Biology and Genetics, Faculty of Arts and ScienceBilecik Seyh Edebali UniversityBilecikTurkey

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