Less is More: Membrane Protein Digestion Beyond Urea-Trypsin Solution for Next-level Proteomics

Area of Science:

• Proteomics
• Biochemistry
• Molecular Biology

Background:

• Membrane protein function investigation requires high-throughput, peptide-centric quantitation.
• Traditional urea-trypsin digestion is insufficient and often denatures proteins, hindering functional studies.
• Previous methods offered incremental advances but failed to preserve native protein states.

Purpose of the Study:

• To review recent advances in membrane protein digestion methods for proteomics.
• To highlight critical discoveries enabling streamlined functional proteomics.
• To overcome barriers in efficient mammalian membrane protein digestion.

Main Methods:

• Utilizing structure/proteomics omni-compatible detergents like n-dodecyl-β-d-maltopyranoside (DDM).
• Employing pepsin and PNGase F columns for improved digestion.
• Developing methods like DDM-low-TCEP (DLT) and flow/detergent-facilitated protease and de-PTM digestions (FDD).

Main Results:

• Shifted digestion paradigms from days to minutes, preserving protein structures and activities.
• Enabled fully automatable pipelines for H/D-exchange (HDX)-protein-peptide-(tandem mass tag)-HPLC.
• Achieved deep coverage, high peptide reproducibility, low artifacts, and minimal leakage in functional proteomics.

Conclusions:

• New digestion methods promote rather than destroy protein structures and activities.
• Streamlined functional proteomics is now achievable for membrane proteins.
• These advancements are critical for future proteomics research.