Comprehensive yeast proteome analysis using a capillary isoelectric focusing-based multidimensional separation...

Area of Science:

• Proteomics
• Yeast Biology
• Membrane Protein Analysis

Background:

• Understanding the yeast proteome is crucial for cell biology research.
• Previous methods have limitations in comprehensive membrane protein identification.
• Detergent-based extraction is common for membrane protein preparation.

Purpose of the Study:

• To develop and validate a CIEF-based multidimensional separation platform for yeast proteome analysis.
• To achieve the largest yeast membrane proteome coverage to date.
• To comprehensively analyze the yeast proteome, including membrane proteins.

Main Methods:

• Utilized CIEF-based multidimensional separation.
• Employed detergent-based (SDS) membrane protein preparation protocol.
• Analyzed soluble, urea-solubilized, and SDS-solubilized fractions.
• Applied a 1% false discovery rate for peptide identifications.
• Used TMHMM for transmembrane domain prediction.

Main Results:

• Identified 2513 distinct yeast proteins from the SDS-solubilized fraction with high confidence.
• Achieved 46% yeast membrane proteome coverage, identifying 407 transmembrane proteins.
• Combined fractions yielded 3632 distinct yeast proteins, representing 55% theoretical proteome coverage.
• Demonstrated the utility of SDS extraction for enriching membrane proteome.

Conclusions:

• The CIEF-based platform is compatible with detergent-based protocols for yeast membrane protein preparation.
• This platform provides the most comprehensive yeast proteome analysis and largest membrane proteome coverage to date.
• The study validates SDS extraction as an effective strategy for membrane proteome enrichment.