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Updated: Jun 23, 2025
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Phosphoproteomic Strategy for Profiling Osmotic Stress Signaling in Arabidopsis
Published on: June 25, 2020
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Decoding Arabidopsis thaliana CPK/SnRK Superfamily Kinase Client Signaling Networks Using Peptide Library and Mass
Nagib Ahsan1,2, Amr R A Kataya1, R Shyama Prasad Rao1,3
1Division of Biochemistry, Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.
Plants (Basel, Switzerland)
|June 19, 2024
Summary
This study identifies plant kinase targets using a high-throughput assay, revealing specific and overlapping relationships crucial for understanding plant signaling pathways and kinase functions.
Area of Science:
- Plant molecular biology
- Biochemistry
- Signal transduction
Background:
- Calcium-dependent protein kinases (CDPKs/CPKs) and SNF-related protein kinases (SnRKs) are vital kinase superfamilies in plants.
- Understanding client specificity within these large kinase families is essential for deciphering plant signaling networks.
Purpose of the Study:
- To identify and characterize potential protein targets for Arabidopsis thaliana CPKs and SnRKs.
- To elucidate kinase-specific and overlapping client relationships within these superfamilies.
Main Methods:
- Utilized the kinase client (KiC) assay, a quantitative, high-throughput mass spectrometry-based in vitro phosphorylation assay.
- Screened eight CPKs, four SnRKs, and two PPCKs against a large synthetic peptide library (2095 peptides, 2661 phosphorylation sites).
Main Results:
- Identified 625 in vitro phosphorylation sites across 203 non-redundant proteins.
- CPK17 showed the highest promiscuity, targeting 105 proteins.
- Discovered four enriched sequence motifs (LxRxxS, RxxSxxR, RxxS, LxxxxS) in CPK/SnRK client phosphopeptides.
Conclusions:
- The study provides novel insights into CPK and SnRK signaling network architectures.
- The findings validate the large-scale KiC assay approach for discovering kinase targets and recapitulate known in vivo relationships.
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