Kinetics and redox regulation of Gpx1, an atypical 2-Cys peroxiredoxin, in Saccharomyces cerevisiae

The budding yeast Saccharomyces cerevisiae has three homologues of glutathione peroxidase (GPX1, GPX2, and GPX3). Two structural homologues of the mammalian glutathione peroxidase, Gpx2 and Gpx3, have been proven to be atypical 2-Cys peroxiredoxins, which prefer to use thioredoxin as an electron donor. Here, we show that Gpx1 is also an atypical 2-Cys peroxiredoxin, but uses glutathione and thioredoxin almost equally. We determined the redox state of Gpx1 in vivo.