Nitric oxide (NO) is a free radical product of cell metabolism that plays diverse and important roles in the regulation of cellular function. S-Nitrosylation is emerging as a specific and fundamental posttranslational protein modification for the transduction of NO bioactivity, but very little is known about its physiological functions in plants. We investigated the molecular mechanism for S-nitrosylation of peroxiredoxin II E (PrxII E) from Arabidopsis thaliana and found that this posttranslational modification inhibits the hydroperoxide-reducing peroxidase activity of PrxII E, thus revealing a novel regulatory mechanism for peroxiredoxins. Furthermore, we obtained biochemical and genetic evidence that PrxII E functions in detoxifying peroxynitrite (ONOO−), a potent oxidizing and nitrating species formed in a diffusion-limited reaction between NO and O2− that can interfere with Tyr kinase signaling through the nitration of Tyr residues. S-Nitrosylation also inhibits the ONOO− detoxification activity of PrxII E, causing a dramatic increase of ONOO−-dependent nitrotyrosine residue formation. The same increase was observed in a prxII E mutant line after exposure to ONOO−, indicating that the PrxII E modulation of ONOO− bioactivity is biologically relevant. We conclude that NO regulates the effects of its own radicals through the S-nitrosylation of crucial components of the antioxidant defense system that function as common triggers for reactive oxygen species– and NO-mediated signaling events.
S-Nitrosylation of Peroxiredoxin II E Promotes Peroxynitrite-Mediated Tyrosine Nitration[W][OA]
M. Romero‐Puertas,Miriam Laxa,A. Matte,Federica Zaninotto,I. Finkemeier,A. Jones,M. Perazzolli,E. Vandelle,K. Dietz,M. Delledonne
Published 2007 in The Plant Cell Online
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- Publication year
2007
- Venue
The Plant Cell Online
- Publication date
2007-12-01
- Fields of study
Biology, Medicine, Chemistry, Environmental Science
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- External record
- Source metadata
Semantic Scholar, PubMed
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