Abstract
Reactivating factor (RF) from Luteococcus japonicus subsp. casei was shown to be constitutively synthesized and to act a by one-step mechanism, being activated independently from stress. Cell reactivation (reversion of a cell’s ability to form macrocolonies) might be ensured by the membrane mechanism of RF action, which is proved with the dependence of antistress activity from the condition of the cytoplasmic membrane and with the form of concentration dependence. The incubation of UV-treated L. casei suspension with RF increased the number of cells with intact barrier membrane (1.6–1.8-fold increase compared to RF-untreated cells) and the number of colony-forming cells. Cross defensive and reactivating RF effects on both L. casei and yeast Saccharomyces cerevisiae cells were described. Bacterial and yeast’s RF compete for membrane receptors. Matrix Assisted Laser Desorption/Ionization time-of-flight (MALDI-TOF) spectrometry revealed that RF of L. casei contained two major peptides of 5.8 and 7.6 kDa, while RF of S. cerevisiae was represented by a single peptide of 5.8 kDa. The presence of 5.8 kDa peptide in RF from bacteria and yeasts might ensure cross responses in these organisms.
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Original Russian Text © L.I. Vorob’eva, E.Yu. Khodzhaev, A.L. Mulyukin, I.Yu. Toropygin, 2009, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2009, Vol. 45, No. 5, pp. 544–549.
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Vorob’eva, L.I., Khodzhaev, E.Y., Mulyukin, A.L. et al. The mechanism of action of reactivating factor from Luteococcus japonicus subsp. casei . Appl Biochem Microbiol 45, 489–493 (2009). https://doi.org/10.1134/S0003683809050056
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DOI: https://doi.org/10.1134/S0003683809050056