Glutathione reductase from Brassica rapa affects tolerance and the redox state but not fermentation ability in response to oxidative stress in genetically modified Saccharomyces cerevisiae

  • Ho-Sung Yoon
  • Sun-Young Shin
  • Young-Saeng Kim
  • Il-Sup Kim
Original Paper


To determine whether the exogenous expression of glutathione reductase (GR) from Brassica rapa subsp. pekinensis (BrGR) can reduce the deleterious effects of unfavorable conditions, we constructed a transgenic Saccharomyces cerevisiae strain bearing the GR gene cloned into the yeast expression vector, pVTU260. BrGR expression was confirmed by semi reverse transcriptase-polymerase chain reaction (RT-PCR) analysis, immunoblotting analysis and an enzyme assay. Ectopic BrGR-expression improved cellular glutathione (GSH) homeostasis after higher GSH accumulation in the transgenic yeast than in the wild-type yeast under H2O2-induced oxidative stress. The BrGR-expressing yeast strain induced the activation of metabolic enzymes (Hxt, G6PDH, GAPDH and Ald), antioxidant systems (Gpx, Trx2, Trx3, Trr1, Tsa1 and porin) and molecular chaperones (Hsp104, Hsp90, Hsp70, Hsp42, Hsp26, Grp, Sti1 and Zpr1), which led to lower oxidative protein damage after a reduction in the level of cellular ROS in the BrGR-expressing yeast strain exposed to H2O2 than in the wild-type yeast strain. BrGR-expression increased the ability to adapt and recover from H2O2-induced oxidative stress and various stressors, including heat shock, menadione, tert-butyl hydroperoxide, heavy metals, sodium dodecyl sulfate, ethanol and NaCl, but did not affect fermentation capacity. These results suggest that ectopic BrGR expression confers acquired tolerance by improving proteostasis and redox homeostasis through co-activation of various cell rescue proteins against ROS-induced oxidative stress in yeast cells.


BrGR expression Oxidative stress Stress tolerance Redox state Cell rescue proteins 



This work was supported by a grant from the Next-Generation BioGreen21 Program (PJ008115), Rural Development Administration, Republic of Korea.

Supplementary material

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Supplementary material 1 (TIFF 5574 kb)
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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Ho-Sung Yoon
    • 1
  • Sun-Young Shin
    • 1
  • Young-Saeng Kim
    • 1
  • Il-Sup Kim
    • 1
  1. 1.Department of BiologyKyungpook National UniversityBuk-gu, DaeguRepublic of Korea

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