Suspension Trapping-Based Sample Preparation Workflow for In-Depth Plant Phosphoproteomics.

Area of Science:

• Plant biology
• Proteomics
• Molecular signaling

Background:

• Plant phosphoproteomics requires high-throughput, sensitive, and accurate methods.
• Traditional protein precipitation methods limit sensitivity and introduce variability in plant phosphoproteomic analysis.

Purpose of the Study:

• To develop an improved workflow for plant phosphoproteomics.
• To enhance sensitivity, accuracy, and throughput for analyzing plant phosphorylation-mediated signaling.

Main Methods:

• Developed a tandem S-Trap-IMAC workflow integrating S-Trap micro-column with Fe-IMAC tip.
• Applied the method to Arabidopsis thaliana phosphoproteome analysis.
• Utilized the method to study abscisic acid (ABA) signaling in Arabidopsis seedlings.

Main Results:

• Tandem S-Trap-IMAC increased Arabidopsis phosphoproteome coverage by over 30% compared to precipitation-based methods.
• Observed improvements in multiply phosphorylated peptides, quantification accuracy, and reduced sample processing time.
• Identified multiply phosphorylated peptides as crucial in early ABA signaling and quantified key phosphorylation sites.

Conclusions:

• The tandem S-Trap-IMAC workflow significantly advances plant phosphoproteomics.
• This optimized method enables high-throughput phosphoproteome profiling, even with low-input plant samples.
• The findings provide deeper insights into plant signaling mechanisms, particularly ABA responses.