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Standard mixtures for proteome studies.

Samuel Purvine¹, Alex F Picone, Eugene Kolker

¹BIATECH, Bothell, Washington 98011, USA.

Omics : a Journal of Integrative Biology

|April 27, 2004

Summary

This study developed peptide and protein mixtures for quality assessment in proteomics. These mixtures, analyzed via liquid chromatography-mass spectrometry, successfully identified nearly all components, validating their use as standards.

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Area of Science:

Proteomics
Analytical Chemistry
Biochemistry

Background:

Complex biological samples present challenges in large-scale proteomics.
Standardized mixtures are needed for reliable quality assessment in proteomic analyses.

Purpose of the Study:

To create and evaluate peptide and protein mixtures for use as quality assessment standards in proteomics.
To validate a statistical model for confidence evaluation of proteomic identifications.

Main Methods:

Preparation of defined peptide and protein mixtures.
Analysis using online high-performance reverse-phase liquid chromatography coupled to an ion trap mass spectrometer.
Data searching with SEQUEST against various databases and statistical confidence evaluation.

Main Results:

High confidence identification of all but one peptide and all proteins in the mixtures.
Successful analysis of quadruply charged peptides.
Demonstrated performance of the statistical model for confidence assessment.

Conclusions:

The proposed peptide and protein mixtures effectively mimic the complexity of large-scale proteomics experiments.
These mixtures are suitable as quality assessment standards for future proteomic studies.
The statistical model provides reliable confidence evaluation for proteomic identifications.

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