Regulation of plant glycine decarboxylase by s-nitrosylation and glutathionylation

Plant Physiol. 2010 Mar;152(3):1514-28. doi: 10.1104/pp.109.152579. Epub 2010 Jan 20.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arabidopsis / enzymology*
  • Arabidopsis Proteins / isolation & purification
  • Arabidopsis Proteins / metabolism*
  • Bacterial Outer Membrane Proteins / metabolism
  • Glycine Dehydrogenase (Decarboxylating) / metabolism*
  • Membrane Potential, Mitochondrial
  • Mitochondria / metabolism*
  • Mitochondrial Proteins / isolation & purification
  • Mitochondrial Proteins / metabolism
  • Nitric Oxide / metabolism
  • Proteomics
  • Reactive Oxygen Species / metabolism
  • S-Nitrosoglutathione / pharmacology
  • Signal Transduction*
  • Tandem Mass Spectrometry


  • Arabidopsis Proteins
  • Bacterial Outer Membrane Proteins
  • Mitochondrial Proteins
  • Reactive Oxygen Species
  • harpin protein, Erwinia amylovora
  • Nitric Oxide
  • S-Nitrosoglutathione
  • Glycine Dehydrogenase (Decarboxylating)