Journal
FEBS LETTERS
Volume 580, Issue 5, Pages 1269-1276Publisher
WILEY
DOI: 10.1016/j.febslet.2006.01.043
Keywords
senescence; proteinase; ascorbate; peroxiredoxin; redox signalling
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Redox factors contributing to nodule senescence were studied in pea. The abundance of the nodule cytosolic peroxiredoxin but not the mitochondrial peroxiredoxin protein was modulated by ascorbate. In contrast to redox-active antioxidants such as ascorbate and cytosolic peroxiredoxin that decreased during nodule development, maximal extractable nodule proteinase activity increased progressively as the nodules aged. Cathepsin-like activities were constant throughout development but serine and cysteine proteinase activities increased during senescence. Senescence-induced cysteine proteinase activity was inhibited by cysteine, dithiotreitol, or E-64. Senescence-dependent decreases in redox-active factors, particularly ascorbate and peroxiredoxin favour decreased redox-mediated inactivation of cysteine proteinases. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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