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- W1596005526 abstract "All living organisms contain redox systems involving thioredoxins (Trx), proteins featuring an extremely conserved and reactive active site that perform thiol-disulfide interchanges with disulfide bridges of target proteins. In photosynthetic organisms, numerous isoforms of Trx coexist, as revealed by sequencing of Arabidopsis genome. The specific functions of many of them are still unknown. In an attempt to find new molecular targets of Trx in Chlamydomonas reinhardtii, an affinity column carrying a cytosolic Trx h mutated at the less reactive cysteine of its active site was used to trap Chlamydomonas proteins that form mixed disulfides with Trx. The major protein bound to the column was identified by amino-acid sequencing and mass spectrometry as a thioredoxin-dependent 2Cys peroxidase. Isolation and sequencing of its gene revealed that this peroxidase is most likely a chloroplast protein with a high homology to plant 2Cys peroxiredoxins. It is shown that the Chlamydomonas peroxiredoxin (Ch-Prx1) is active with various thioredoxin isoforms, functions as an antioxidant toward reactive oxygen species (ROS), and protects DNA against ROS-induced degradation. Expression of the peroxidase gene in Chlamydomonas was found to be regulated by light, oxygen concentration, and redox state. The data suggest a role for the Chlamydomonas Prx in ROS detoxification in the chloroplast." @default.
- W1596005526 created "2016-06-24" @default.
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- W1596005526 date "2002-01-01" @default.
- W1596005526 modified "2023-09-27" @default.
- W1596005526 title "Isolation and characterization of a thioredoxin-dependent peroxidase from<i>Chlamydomonas reinhardtii</i>" @default.
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- W1596005526 doi "https://doi.org/10.1046/j.0014-2956.2001.02648.x" @default.
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