A method for detection of overoxidation of cysteines: peroxiredoxins are oxidized in vivo at the active-site cysteine during oxidative stress

作者：Elsa Wagner, Sylvie Luche, Lucia Penna, Mireille Chevallet, Alain Van Dorsselaer, Emmanuelle Leize‐Wagner, Thierry Rabilloud · 发表于：Biochemical Journal · 年份：2002 · DOI：10.1042/bj20020525 · 被引用次数：179 · 研究领域：Redox biology and oxidative stress、Heat shock proteins research、bioluminescence and chemiluminescence research

Peroxiredoxins are often encountered as double spots when analysed by two-dimensional electrophoresis. The quantitative balance between these two spots depends on the physiological conditions, and is altered in favour of the acidic variant by oxidative stress for all the peroxiredoxins we could analyse. Using HeLa cells as a model system, we have further analysed the two protein isoforms represented by the two spots for each peroxiredoxin. The use of selected enzyme digestion and MS demonstrated that the acidic variant of all the peroxiredoxins analysed is irreversibly oxidized at the active-site cysteine into cysteine sulphinic or sulphonic acid. Thus, this acidic variant represents an inactivation form of the peroxiredoxins, and provides a useful marker of oxidative damage to the cells.