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Microbiology

, Volume 82, Issue 2, pp 126–132 | Cite as

Effect of the reactivating factor of Luteococcus japonicus subsp. casei on the expression of SOS response genes

  • N. G. Loiko
  • L. I. Vorob’eva
  • E. Yu. Khodzhaev
  • A. N. Kozlova
  • V. F. Gal’chenko
  • G. I. El’-Registan
Experimental Articles

Abstract

The effect of the extracellular peptide reactivating factor (RF) synthesized by Luteococcus casei on stress response of Escherichia coli cells subjected to UV irradiation was studied. For these studies, we constructed a test strain carrying the umuD-lacZ operon. The expression rate of this operon reflects the rate of SOS response. Protective effect of RF, defined as the number of cells retaining the colony-forming activity (CFU) after UV irradiation (49–1166 J/m2), was dose-dependent, species-nonspecific, and increasing with increase of the stress load. RF was demonstrated to possess the properties of a direct adaptogen: 15 min of preincubation with RF caused a 1.5–6-fold decrease in expression of the umuD SOS response gene in UV-treated cells, concurrently with a 1.2–7.5 times increase in the number of viable cells (those having retained their colony-forming activity). The probable mechanisms of the protective effect of RF are being discussed.

Keywords

reactivating factor (RF) Luteococcus japonicus subsp. casei stress protection UV irradiation E. coli SOS response umuD-lacZ hybrid operon 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • N. G. Loiko
    • 1
  • L. I. Vorob’eva
    • 2
  • E. Yu. Khodzhaev
    • 2
  • A. N. Kozlova
    • 1
  • V. F. Gal’chenko
    • 1
  • G. I. El’-Registan
    • 1
  1. 1.Winogradsky Institute of MicrobiologyRussian Academy of SciencesMoscowRussia
  2. 2.Moscow State UniversityMoscowRussia

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