A Simplified Method for Comprehensive Capture of the Staphylococcus aureus Proteome

Area of Science:

• Microbiology
• Proteomics
• Pathogen Research

Background:

• Staphylococcus aureus is a significant human pathogen responsible for diverse infections.
• A complete understanding of its proteome, particularly the 'dark proteome,' remains incomplete.
• Existing proteomic studies often lack comprehensive coverage or require extensive sample preparation.

Purpose of the Study:

• To generate the most comprehensive Staphylococcus aureus proteome dataset to date.
• To develop a streamlined and reproducible proteomic analysis workflow.
• To investigate the dynamic changes in the S. aureus proteome during growth phases.

Main Methods:

• Utilized streamlined liquid- and gas-phase fractionation coupled with PASEF analysis on a TIMS-TOF instrument.
• Employed a single-shot, DIA-based analysis for proteome identification.
• Applied the generated proteome library for differential expression profiling.

Main Results:

• Identified a total of 2,231 Staphylococcus aureus proteins, achieving 85.6% coverage.
• Demonstrated high reproducibility and minimal input material requirements.
• Revealed dynamic alterations in metabolic processes, ATP production, RNA processing, and stress-response proteins during stationary growth.
• Achieved 94% library and 80.5% proteome identification using the single-shot DIA approach.

Conclusions:

• Developed a highly comprehensive and reproducible proteomic resource for Staphylococcus aureus.
• The study significantly expands the known proteome of S. aureus, including the 'dark proteome.'
• The generated resource facilitates further research into the adaptive mechanisms and pathogenicity of this important bacterium.