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Direct analysis of protein complexes using mass spectrometry.
A J Link1, J Eng, D M Schieltz
1Department of Molecular Biotechnology, University of Washington, Seattle 98195, USA.
Nature Biotechnology
|July 15, 1999
Summary
Researchers developed a fast, sensitive method using liquid chromatography (LC) and tandem mass spectrometry (MS/MS) to identify proteins in macromolecular complexes. This technique identified a new protein in the yeast and human 40S ribosomal subunit.
Area of Science:
- Proteomics
- Molecular Biology
- Biochemistry
Background:
- Macromolecular complexes are crucial cellular machinery.
- Comprehensive protein identification within these complexes is challenging.
- Existing methods may lack speed and sensitivity.
Purpose of the Study:
- To develop a rapid and sensitive method for comprehensive protein identification in macromolecular complexes.
- To apply this method to analyze the Saccharomyces cerevisiae ribosome.
- To discover novel protein components of cellular complexes.
Main Methods:
- Utilized multidimensional liquid chromatography (LC) for peptide separation.
- Employed tandem mass spectrometry (MS/MS) for peptide fragmentation.
- Applied the SEQUEST algorithm, using genomic sequences, to infer amino acid sequences from fragment ions.
Main Results:
- Successfully identified over 100 proteins in a single analytical run.
- Identified a novel protein component of the Saccharomyces cerevisiae 40S ribosomal subunit.
- Demonstrated the applicability to both yeast and human 40S subunits.
Conclusions:
- The developed LC-MS/MS and SEQUEST-based method offers a rapid and sensitive approach for comprehensive proteomic analysis of macromolecular complexes.
- This technique facilitates the discovery of novel protein components, even in large complexes.
- The findings contribute to a deeper understanding of ribosome structure and function.