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Moonlighting by different stressors: crystal structure of the chaperone species of a 2-Cys peroxiredoxin. | LitMetric
2-Cys peroxiredoxins (Prxs) play two different roles depending on the physiological status of the cell. They are thioredoxin-dependent peroxidases under low oxidative stress and ATP-independent chaperones upon exposure to high peroxide concentrations. These alternative functions have been associated with changes in the oligomerization state from low-(LMW) to high-molecular-weight (HMW) species. Here we present the structures of Schistosoma mansoni PrxI in both states: the LMW decamer and the HMW 20-mer formed by two stacked decamers. The latter is the structure of a 2-Cys Prx chaperonic form. Comparison of the structures sheds light on the mechanism by which chemical stressors, such as high H(2)O(2) concentration and acidic pH, are sensed and translated into a functional switch in this protein family. We also propose a model to account for the in vivo formation of long filaments of stacked Prx rings.
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