Proteomic Sample Preparation through Extraction by Unspecific Adsorption on Silica Beads for ArgC-like Digestion

Area of Science:

• Proteomics
• Analytical Chemistry
• Biochemistry

Background:

• Traditional mass spectrometry sample preparation is complex, time-consuming, and prone to sample loss.
• Existing methods like acetone precipitation/in-solution digestion (AP/IS) and filter-aided sample preparation (FASP) have limitations in capacity and efficiency.

Purpose of the Study:

• To develop a streamlined, versatile protein extraction protocol for mass spectrometry-based proteomics.
• To improve protein identification yields and proteome coverage compared to established methods.

Main Methods:

• Introduction of a lean adsorption-based protocol (ABP) for protein extraction from cell lysates.
• Adaptation of the protocol for sample modification under harsh chemical conditions (organic solvents, high salt, low pH).
• Comparison of ABP with AP/IS and FASP, including combination with ArgC-like digestion.

Main Results:

• ABP offers high versatility and significantly reduces preparation steps.
• Protein identification increased by 18.27% (5386 unique proteins) when ABP was combined with ArgC-like digestion compared to tryptic digestion (4554).
• Improved identification of membrane proteins and histones, reduced spectra complexity, and enhanced fragmentation and intensity coverage were observed.

Conclusions:

• The adsorption-based protocol (ABP) provides a more efficient and comprehensive approach to mass spectrometry sample preparation.
• ABP is a valuable complementary method that enhances proteome coverage and simplifies workflows.
• This method facilitates deeper proteomic insights, particularly for challenging protein classes.