Technical considerations for large-scale parallel reaction monitoring analysis

Area of Science:

• Proteomics
• Mass Spectrometry
• Quantitative Biology

Background:

• Selected reaction monitoring (SRM) is a standard for targeted proteomics but has limitations in selectivity and throughput.
• High-resolution instruments like quadrupole-orbitrap offer improved selectivity and speed for quantitative proteomics.
• Parallel reaction monitoring (PRM) on these instruments shows comparable or superior performance to SRM.

Purpose of the Study:

• To establish a baseline for optimizing large-scale parallel reaction monitoring (PRM) experiments on quadrupole-orbitrap instruments.
• To guide the proteomics community in balancing sensitivity and the number of peptides analyzed.
• To explore real-time adjustments for peptide monitoring windows to enhance scalability.

Main Methods:

• Optimization of acquisition parameters for quadrupole-orbitrap mass spectrometry in PRM mode.
• Adjustment of fill time, resolving power, multiplexing, and quadrupole selection windows.
• Implementation of real-time correction for scheduled peptide monitoring windows to compensate for elution time drift.

Main Results:

• Demonstrated that PRM on quadrupole-orbitrap instruments offers high selectivity and quantification performance.
• Identified key acquisition parameters (fill time, quadrupole window) crucial for balancing sensitivity and throughput.
• Validated real-time correction of monitoring windows, enabling significant scaling of targeted peptides per experiment.

Conclusions:

• The study provides essential guidance for setting acquisition parameters in large-scale PRM experiments.
• Optimized PRM methods maintain sensitivity while increasing the number of targeted peptides, advancing systems biology and biomarker discovery.
• The proposed approaches facilitate unprecedented scale in targeted proteomics, meeting demands in systems biology and biomarker evaluation.