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A gene encoding a fusion protein consisting of Escherichia coli iron superoxide dismutase (FeSOD) with the mitochondrial targeting presequence of yeast manganese superoxide dismutase (MnSOD) was cloned and expressed in E. coli and in Saccharomyces cerevisiae DL1Mn- yeast cells deficient in MnSOD. In the yeast cells the fusion protein was imported into the mitochondrial matrix. However, the presequence was not cleaved. In a control set of experiments, the E. coli FeSOD gene without the yeast MnSOD leader sequence was also cloned and expressed in S. cerevisiae DL1Mn- cells. In this case the FeSOD was located in the cytosol and was not imported into the mitochondrial matrix. E. coli FeSOD, with and without the yeast MnSOD presequence, proved to be active in yeast, but, whereas the FeSOD targeted to the mitochondria of yeast cells deficient in MnSOD protected the cells from the toxic effects of oxidative stress, FeSOD without the yeast MnSOD presequence did not protect the yeast cells deficient in MnSOD against oxidative stress.

Escherichia coli iron superoxide dismutase targeted to the mitochondria of yeast cells protects the cells against oxidative stress.