Suspension trapping (STrap) sample preparation method for bottom-up proteomics analysis.

Area of Science:

• Proteomics
• Biochemistry
• Analytical Chemistry

Background:

• Current bottom-up proteomics methods require faster, simpler, and more robust sample processing, especially for low protein quantities.
• Existing techniques can be complex and time-consuming, limiting comprehensive analysis of limited biological samples.

Purpose of the Study:

• To develop and validate a novel, efficient, and user-friendly method for comprehensive sample processing in bottom-up proteomics.
• To address the limitations of existing methods in handling low protein amounts and to streamline the workflow.

Main Methods:

• The suspension trapping method utilizes SDS-based protein extraction followed by rapid detergent removal.
• It incorporates reactor-type protein digestion and peptide cleanup within a specialized suspension trapping tip.
• Proteins are solubilized in SDS, acidified, and passed through a depth filter to trap the protein suspension, separating particulate matter.

Main Results:

• The method efficiently removes SDS and contaminants, allowing for rapid protease digestion (e.g., tryptic proteolysis in ~30 min).
• It successfully processes low protein loads, down to the microgram/submicrogram levels.
• The entire process, including detergent removal (~5 min), is significantly faster than conventional methods.

Conclusions:

• The suspension trapping method provides a fast, uncomplicated, and robust approach for proteomics sample processing.
• Its efficiency with low protein amounts and diverse sample types (lysates, membrane preparations, immunoprecipitates) positions it as a valuable tool.
• This simplified methodology is expected to become an essential technique in proteomics research.