Loss-less Nano-fractionator for High Sensitivity, High Coverage Proteomics.

Area of Science:

• Proteomics
• Analytical Chemistry
• Biochemistry

Background:

• Mass spectrometry (MS)-based proteomics enables deep cellular proteome coverage.
• Orthogonal peptide fractionation coupled with LC-MS/MS is powerful for identification and quantification.
• Traditional methods require milligram-scale peptide amounts and high flow rates.

Purpose of the Study:

• To introduce a novel "spider fractionator" for enhanced proteomic analysis.
• To demonstrate sensitive proteome characterization with reduced sample input.
• To enable rapid and automated in-depth proteomic profiling of multiple cell lines.

Main Methods:

• A nanobore chromatography system coupled to an eight-port flow-selector valve for automated fractionation.
• Loss-less sample concatenation into 2-96 fractions.
• Optimization of fractionation and LC-MS/MS gradient parameters for deep coverage.

Main Results:

• The spider fractionator achieved near-comprehensive proteome coverage with sub-microgram sample amounts.
• Quantification of close to 10,000 proteins was demonstrated.
• Automated characterization of 12 human cell lines revealed proteomic differences related to origin and differentiation, with a median depth of 11,472 proteins.

Conclusions:

• The spider fractionator is a flexible and user-friendly technology for comprehensive proteome characterization.
• It significantly reduces sample requirements for deep proteomic analysis.
• Enables rapid, automated, and in-depth profiling of complex biological samples like cell lines.