title: Regulation of plant glycine decarboxylase by s-nitrosylation and glutathionylation.
abstract: Mitochondria play an essential role in nitric oxide (NO) signal transduction in plants. Using the biotin-switch method in conjunction with nano-liquid chromatography and mass spectrometry, we identified 11 candidate proteins that were S-nitrosylated and/or glutathionylated in mitochondria of Arabidopsis (Arabidopsis thaliana) leaves. These included glycine decarboxylase complex (GDC), a key enzyme of the photorespiratory C(2) cycle in C3 plants. GDC activity was inhibited by S-nitrosoglutathione due to S-nitrosylation/S-glutathionylation of several cysteine residues. Gas-exchange measurements demonstrated that the bacterial elicitor harpin, a strong inducer of reactive oxygen species and NO, inhibits GDC activity. Furthermore, an inhibitor of GDC, aminoacetonitrile, was able to mimic mitochondrial depolarization, hydrogen peroxide production, and cell death in response to stress or harpin treatment of cultured Arabidopsis cells. These findings indicate that the mitochondrial photorespiratory system is involved in the regulation of NO signal transduction in Arabidopsis.
authors.affiliation: Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, D-85764 Munich/Neuherberg, Germany.
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Palmieri
authors.forename: Christian
authors.initials: C
authors.lastname: Lindermayr
authors.forename: Hermann
authors.initials: H
authors.lastname: Bauwe
authors.forename: Clara
authors.initials: C
authors.lastname: Steinhauser
authors.forename: Joerg
authors.initials: J
authors.lastname: Durner
mesh_terms: D017360:Arabidopsis / Q000201:enzymology*; D029681:Arabidopsis Proteins / Q000302:isolation & purification / Q000378:metabolism*; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism; D050841:Glycine Dehydrogenase (Decarboxylating) / Q000378:metabolism*; D053078:Membrane Potential, Mitochondrial; D008928:Mitochondria / Q000378:metabolism*; D024101:Mitochondrial Proteins / Q000302:isolation & purification / Q000378:metabolism; D009569:Nitric Oxide / Q000378:metabolism; D040901:Proteomics; D017382:Reactive Oxygen Species / Q000378:metabolism; D026422:S-Nitrosoglutathione / Q000494:pharmacology; D015398:Signal Transduction; D053719:Tandem Mass Spectrometry
chemical_list: D029681:Arabidopsis Proteins; D001425:Bacterial Outer Membrane Proteins; D024101:Mitochondrial Proteins; D017382:Reactive Oxygen Species; C075462:harpin protein, Erwinia amylovora; D009569:Nitric Oxide; D026422:S-Nitrosoglutathione; D050841:Glycine Dehydrogenase (Decarboxylating)