Protein Phosphatase 2A Signaling in Plant Stress Responses

Protein Phosphatase 2A (PP2A) is a conserved serine/threonine phosphatase that functions as a heterotrimeric holoenzyme, integrating catalytic, scaffold and regulatory subunits to fine-tune phosphorylation networks in plants. Through dephosphorylation of key signalling proteins, PP2A modulates hormone pathways, reactive oxygen species (ROS) cascades and ion fluxes that underpin responses to drought, salinity, pathogens and oxidative stress. Regulatory B subunits confer substrate specificity and subcellular targeting, allowing PP2A to orchestrate processes from stomatal aperture control and osmotic adjustment to defence gene expression and chromatin remodelling. Emerging evidence places PP2A at the crossroads of abscisic acid (ABA)-mediated stress signalling, calcium-dependent responses and receptor-mediated immune activation. By counterbalancing kinase activities, PP2A ensures appropriate amplitude and duration of stress signals, thereby safeguarding growth and productivity under fluctuating environments.

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Protein Phosphatase 2A Signaling in Plant Stress Responses publication trend

The graph below shows the total number of articles in protein phosphatase 2a signaling in plant stress responses across all publications each year (not limited to Nature Index journals).

Technical terms

PP2A holoenzyme: A trimeric complex composed of catalytic (C), scaffold (A) and regulatory (B) subunits that dephosphorylates serine/threonine residues on target proteins.

Regulatory B subunit: Variable component of PP2A that determines substrate specificity, subcellular localisation and interaction partners of the holoenzyme.

Reactive oxygen species (ROS): Chemically reactive molecules (e.g., hydrogen peroxide, superoxide) produced during stress that act as signalling messengers but can cause cellular damage if unchecked.

Osmotic stress: Cellular dehydration and ion imbalance triggered by drought or high salinity, leading to activation of protective signalling pathways.

Abscisic acid (ABA): A plant hormone central to drought and salt stress responses, modulating stomatal closure and gene expression through phosphorylation-dependent cascades.

References

1. “B” Regulatory Subunits of PP2A: Their Roles in Plant Development and Stress Reactions. International Journal of Molecular Sciences (2023).
2. Walnut phosphatase 2A proteins interact with basic leucine zipper protein JrVIP1 to regulate osmotic stress response via calcium signaling. Forestry Research (2024).
3. Treatments with Diquat Reveal the Relationship between Protein Phosphatases (PP2A) and Oxidative Stress during Mitosis in Arabidopsis thaliana Root Meristems. Plants (2024).