Proteome Analysis Using Gel-LC-MS/MS.

Area of Science:

• Proteomics
• Analytical Chemistry
• Biochemistry

Background:

• Bottom-up proteomics workflows often require sample cleanup and fractionation.
• One-dimensional SDS-PAGE is a common technique for protein separation.

Purpose of the Study:

• To describe a protocol for processing protein samples using 1D SDS gels prior to protease digestion for proteomics.
• To present methods for both sample fractionation and cleanup using 1D SDS-PAGE.

Main Methods:

• Protein samples processed using 1D SDS gels followed by in-gel protease digestion.
• Subsequent analysis via reversed-phase nanocapillary ultra-high-pressure liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS).
• Protocols for sample fractionation or cleanup, with optional in-solution reduction/alkylation.

Main Results:

• 1D SDS gels effectively fractionate complex proteomes or clean up low microgram samples with minimal loss.
• The described protocol enables high-throughput processing for quantitative proteome studies.
• Optimization of trypsin digestion and comparison with in-solution digestion were performed.

Conclusions:

• 1D SDS-PAGE is a versatile and accessible technique for sample preparation in proteomics.
• The protocol facilitates robust peptide identification and protein inference from diverse samples.
• This approach supports quantitative proteomic analyses across multiple samples.