A fully automated high-throughput system for simultaneously enriching and separating intact glycopeptides

Area of Science:

• * Proteomics and Glycomics
• * Analytical Chemistry
• * Automation and High-Throughput Systems

Background:

• * Glycopeptide analysis is crucial for understanding biological processes.
• * Existing methods for glycopeptide enrichment and separation can be time-consuming and limit throughput.
• * There is a need for automated, high-throughput solutions for large-scale glycoproteomic studies.

Purpose of the Study:

• * To develop an improved, fully automated high-throughput system (AutoGP 2) for simultaneous enrichment and separation of intact glycopeptides.
• * To evaluate the performance, including throughput, sensitivity, and reproducibility, of the AutoGP 2 system.
• * To demonstrate the system's suitability for large cohort clinical glycoproteomic sample analysis.

Main Methods:

• * Introduction of a second 10-port valve to the existing AutoGP system to enable simultaneous processing.
• * Systematic evaluation of optimal operating parameters for the AutoGP 2 system.
• * Assessment of intra-day and inter-day reproducibility using 24-hour and 15-day stress tests.
• * Coupling AutoGP 2 with a high-resolution Orbitrap mass spectrometer.

Main Results:

• * AutoGP 2 significantly improves sample analysis throughput compared to the previous AutoGP system.
• * Over 560 site-specific glycans were identified from 1 μg peptide mixture with median CV of 10.8% in triplicate analyses.
• * The instrument's duty cycle increased from 55% to 80%, saving 166 minutes per two-sample analysis.
• * Demonstrated outstanding sensitivity and reproducibility.

Conclusions:

• * AutoGP 2 is a highly effective automated system for simultaneous enrichment and separation of intact glycopeptides.
• * The system offers significant improvements in throughput, sensitivity, and reproducibility for glycoproteomics.
• * AutoGP 2 is well-suited for large-scale clinical glycoproteomic sample analysis and sample-limited studies.