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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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ROS signalling--specificity is required.

Ian M Møller1, Lee J Sweetlove

  • 1Department of Genetics and Biotechnology, Faculty of Agricultural Sciences, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark. ian.max.moller@agrsci.dk

Trends in Plant Science
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PubMed
Summary

Plant peptides from damaged proteins act as specific messengers during oxidative stress. These peptides help coordinate gene expression to manage localized cellular damage and enhance plant stress responses.

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Area of Science:

  • Plant molecular biology
  • Oxidative stress signaling
  • Cellular stress responses

Background:

  • Reactive oxygen species (ROS) increase in plants under stress, causing damage but also signaling.
  • Hydrogen peroxide (H2O2) triggers general stress responses but lacks specificity for localized stress.
  • A mechanism for specific, localized stress signaling in plants is needed.

Purpose of the Study:

  • To propose that peptides from damaged proteins act as specific secondary messengers for ROS.
  • To explain how these peptides could regulate source-specific genes during oxidative stress.
  • To suggest a role for peptides in coordinating organellar and nuclear gene expression.

Main Methods:

  • Conceptual framework development.
  • Literature review on ROS signaling and protein breakdown.
  • Hypothesis formulation based on existing data.

Main Results:

  • Peptides from oxidatively damaged proteins can act as specific secondary ROS messengers.
  • These peptides can target and regulate genes specific to the stress source (e.g., chloroplasts, mitochondria).
  • Unmodified peptides from protein breakdown may coordinate nuclear and organellar gene expression.

Conclusions:

  • Peptide-based signaling offers a specific mechanism for retrograde ROS communication in plants.
  • This peptide signaling pathway is crucial for managing localized oxidative stress and adapting to environmental challenges.
  • Understanding this pathway can lead to strategies for improving plant stress tolerance.