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Updated: May 31, 2026

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
Published on: January 14, 2016
The 14-3-3 isoforms chi and epsilon differentially bind client proteins from developing Arabidopsis seed
Kirby N Swatek1, Katherine Graham, Ganesh K Agrawal
1Interdisciplinary Plant Group and Department of Biochemistry, University of Missouri, Christopher S Bond Life Sciences Center, Columbia, Missouri 65211, United States.
This study identifies 104 proteins interacting with 14-3-3 proteins during Arabidopsis seed development. These findings reveal isoform-specific interactions, suggesting specialized roles for 14-3-3 proteins in plant seed biology.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- 14-3-3 proteins are crucial regulators of cellular processes in plants.
- They modulate protein interactions and enzymatic activities via phosphorylation.
- Their specific roles in oilseed development are not fully understood.
Purpose of the Study:
- To characterize the 14-3-3 protein interactome in developing Arabidopsis seeds.
- To investigate potential isoform-specific interactions of 14-3-3 proteins.
- To understand the involvement of 14-3-3 proteins in seed metabolic pathways.
Main Methods:
- Affinity purification using recombinant Arabidopsis 14-3-3 isoforms (chi and epsilon) bound to a Sepharose matrix.
- Quantitative protein identification using Gel-Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (GeLC-MS/MS) and spectral counting.
- Analysis of nine biological replicates to identify high-confidence interacting proteins.
Main Results:
- Identified 104 putative 14-3-3 binding proteins in developing Arabidopsis seeds.
- Observed distinct binding preferences between 14-3-3 isoforms chi and epsilon.
- Found interactions with proteins involved in glycolysis and fatty acid synthesis.
Conclusions:
- 14-3-3 proteins interact with diverse metabolic pathways essential for seed development.
- Evidence suggests functional specialization between 14-3-3 isoforms in Arabidopsis seed development.
- This study provides insights into the regulatory network governing oilseed filling.
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