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Immunodetection of S-Nitrosoglutathione Reductase Protein in Plant Samples.
S-nitrosation, the attachment of a nitroso group to cysteine thiols, has been recognized as an important posttranslational modification of proteins by nitric oxide and related reactive nitrogen species. Mechanisms and significance of S-nitrosation in the regulation of the structure and activity of proteins have been extensively studied in animal and plant systems. In plants, protein S-nitrosation is involved in signaling pathways of plant hormones and regulators during plant growth and development and in responses to abiotic and biotic stress stimuli. S-nitrosoglutathione reductase (GSNOR) has been identified as a key enzyme controlling the intracellular level of S-nitrosothiols. GSNOR irreversibly degrades S-nitrosoglutathione (GSNO), the major low molecular weight S-nitrosothiol involved in the formation of protein S-nitrosothiols through transnitrosylation. GSNOR level and activity in plant cells are modulated during plant development and in response to external stimuli such as pathogen infection. In this chapter, we give a detailed description of the immunochemical detection of the GSNOR protein in plant samples.
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