Frontiers in Plant Science (Feb 2016)

Antioxidant systems are regulated by nitric oxide-mediated post-translational modifications (NO-PTMs)

  • Juan Carlos Begara-Morales,
  • Beatriz eSánchez-Calvo,
  • Mounira eChaki,
  • Raquel eValderrama,
  • Capilla eMata-Pérez,
  • Maria N Padilla,
  • Francisco J Corpas,
  • Juan B Barroso

DOI
https://doi.org/10.3389/fpls.2016.00152
Journal volume & issue
Vol. 7

Abstract

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Nitric oxide (NO) is a biological messenger that orchestrates a plethora of plant functions, mainly through post-translational modifications (PTMs) such as S-nitrosylation or tyrosine nitration. In plants, hundreds of proteins have been identified as potential targets of these NO-PTMs under physiological and stress conditions indicating the relevance of NO in plant-signaling mechanisms. Among these NO protein targets, there are different antioxidant enzymes involved in the control of reactive oxygen species (ROS), such as H2O2, which is also a signal molecule. This highlights the close relationship between ROS/NO signaling pathways. The major plant antioxidant enzymes, including catalase, superoxide dismutases (SODs) peroxiredoxins (Prx) and all the enzymatic components of the ascorbate-glutathione (Asa-GSH) cycle, have been shown to be modulated to different degrees by NO-PTMs. This mini-review will update the recent knowledge concerning the interaction of NO with these antioxidant enzymes, with a special focus on the components of the Asa-GSH cycle and their physiological relevance.

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