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Five peroxiredoxin genes have been identified in Drosophila melanogaster on the basis of a genome-wide search. Three of the genes (DPx-4156, DPx-4783, and DPx-5037) fall into the 2-Cys subgroup, while the other two (DPx-2540 and DPx-6005) belong to the 1-Cys subgroup. Using cDNAs, all five were expressed in E. coli and the purified recombinant proteins were shown to reduce H(2)O(2) in the presence of dithiothreitol. The three 2-Cys Prx were also shown to be active in the thioredoxin system and were, consequently, classified as thioredoxin peroxidases. Antisera raised against the DPx-4783 recombinant protein crossreacted with all family members and recognized protein species of the predicted sizes (22-27 kD). All five family members, when individually overexpressed in Drosophila S2 cells, conferred some resistance to H(2)O(2) treatment, as measured by cell viability. Functional diversification of the Drosophila peroxiredoxin family members was suggested by two lines of evidence: (i) the patterns of mRNA accumulation varied for the different genes during development and (ii) recombinant proteins fused to an epitope tag and overexpressed in Drosophila cells, differed in subcellular localizations--three proteins occurred in the cytosol, one was localized to the mitochondria, and one was found to be secreted.
Authors : Radyuk S N , Klichko V I , Spinola B , Sohal R S , Orr W C ,
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