Effect of periplasmic expression of recombinant mouse interleukin-4 on hydrogen peroxide concentration and catalase activity in Escherichia coli

Oxidative stress occurs as a result of imbalance between generation and detoxification of reactive oxygen species (ROS). This kind of stress was rarely discussed in connection with foreign protein production in Escherichia coli. Relation between cytoplasmic recombinant protein expression with H2O2 c...

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Veröffentlicht in:Gene 2012-12, Vol.511 (2), p.455-460
Hauptverfasser: Mehdizadeh Aghdam, Elnaz, Mahmoudi Azar, Lena, Barzegari, Abolfazl, Karimi, Farrokh, Mesbahfar, Majid, Samadi, Naser, Hejazi, Mohammad Saeid
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Sprache:eng
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Zusammenfassung:Oxidative stress occurs as a result of imbalance between generation and detoxification of reactive oxygen species (ROS). This kind of stress was rarely discussed in connection with foreign protein production in Escherichia coli. Relation between cytoplasmic recombinant protein expression with H2O2 concentration and catalase activity variation was already reported. The periplasmic space of E. coli has different oxidative environment in relative to cytoplasm and there are some benefits in periplasmic expression of recombinant proteins. In this study, hydrogen peroxide concentration and catalase activity following periplasmic expression of mouse IL-4 were measured in E. coli. After construction of pET2mIL4 plasmid, the expression of recombinant mouse interleukin-4 (mIL-4) was confirmed. Then, the H2O2 concentration and catalase activity variation in the cells were studied in exponential and stationary phases at various ODs and were compared to those of wild type cells and empty vector transformed cells. It was revealed that empty vector introduction and periplasmic recombinant protein expression increased significantly the H2O2 concentration of the cells. However, the H2O2 concentration in mIL-4 expressing cells was significantly higher than its concentration in empty vector transformed cells, demonstrating more effects of recombinant mIL-4 expression on H2O2 elevation. Likewise, although catalase activity was reduced in foreign DNA introduced cells, it was more lowered following expression of recombinant proteins. Correlation between H2O2 concentration elevation and catalase activity reduction with cell growth depletion is also demonstrated. It was also found that recombinant protein expression results in cell size increase. ► Significant H2O2 elevation was occurred in the recombinant cells. ► Catalase activity reduction was observed in the recombinant cells. ► H2O2 elevation in mIL-4 expressing cells was higher than foreign DNA introduced cells. ► Correlation between oxidative stress with cell growth depletion was also observed. ► Besides metabolic load, H2O2 upshift is occurred in recombinant cells.
ISSN:0378-1119
1879-0038
DOI:10.1016/j.gene.2012.09.014