Identification of the major oxidatively damaged proteins in Escherichia coli cells exposed to oxidative stress.

The Journal of Biological Chemistry
J TamaritJ Ros

Abstract

In the present study we have analyzed protein oxidation on Escherichia coli when these cells were submitted to different stress conditions such as hydrogen peroxide, superoxide-generating compounds, and iron overloading. Carbonyl groups on oxidized cell proteins were examined by Western blot immunoassay. When anaerobically grown E. coli cells were exposed to hydrogen peroxide stress, alcohol dehydrogenase E, elongation factor G, the heat shock protein DNA K, oligopeptide-binding protein A, enolase, and the outer membrane protein A were identified as the major protein targets. A similar immunostained band pattern was found when cells were shifted from anaerobic to aerobic conditions in the presence of different concentrations of iron; it is relevant to note that oxidation of outer membrane protein C, not observed in peroxide stress conditions, was clearly detected as the concentration of iron was increased in the culture media. The hydrogen peroxide stress performed under aerobic conditions affected the beta-subunit of F0F1-ATPase; the rest of the oxidized protein pattern was very similar to that found for anaerobic conditions, with the exception of alcohol dehydrogenase E, a protein not synthesized aerobically. Cells submitted ...Continue Reading

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