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Enzymatic reactions of ascorbate and glutathione that prevent peroxide damage in soybean root nodules
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Enzymatic reactions of ascorbate and glutathione that prevent peroxide damage in soybean root nodules
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Journal Article
Enzymatic reactions of ascorbate and glutathione that prevent peroxide damage in soybean root nodules
1986
Overview
The critical problem of oxygen toxicity for nitrogen-fixing organisms may be related to damage caused by oxygen radicals and peroxides. An enzymatic mechanism is described for removal of peroxides in root nodules of soybean (Glycine max). The system utilizes ascorbate as an antioxidant and glutathione as a reductant to regenerate ascorbate. The enzymes involved are ascorbate peroxidase (ascorbate:hydrogen-peroxide oxidoreductase, EC 1.11.1.7), dehydroascorbate reductase (glutathione:dehydroascorbate oxidoreductase, EC 1.8.5.1), and glutathione reductase (NADPH:oxidized-glutathione oxidoreductase, EC 1.6.4.2). The reactions are essentially the same as those involving scavenging of H2O2 in chloroplasts. Glutathione peroxidase (glutathione:hydrogen-peroxide oxidoreductase, EC 1.11.1.9) was not detected. During the course of early nodule development, ascorbate peroxidase and dehydroascorbate reductase activities and total glutathione contents of nodule extracts increased strikingly and were positively correlated with acetylene reduction rates and nodule hemoglobin contents. The evidence indicates an important role of glutathione, ascorbate, ascorbate peroxidase, dehydroascorbate reductase, and glutathione reductase as components of a peroxide-scavenging mechanism in soybean root nodules.
Publisher
National Academy of Sciences of the United States of America,National Acad Sciences
Subject
/ Agronomy. Soil science and plant productions
/ Alkynes
/ Biological and medical sciences
/ Cytosol
/ Enzymes
/ Fundamental and applied biological sciences. Psychology
/ Nodules
/ PEPTIDE
/ PEPTIDES
/ PEPTIDOS
/ Plant physiology and development
/ Plants
/ Soybeans
/ Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
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