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Evaluation of individual protein errors in silver-stained two-dimensional gels
C Mark Smales1, John R Birch, Andrew J Racher
1Research School of Biosciences, University of Kent, Canterbury CT2 7NJ, Kent, UK. C.M.Smales@kent.ac.uk
Biochemical and Biophysical Research Communications
|June 25, 2003
Summary
Protein spot volume directly impacts data reproducibility in 2D gel electrophoresis using silver staining. Low-abundance proteins contribute most to process error, necessitating individual spot volume variation analysis for accurate results.
Area of Science:
- Proteomics
- Biochemistry
- Analytical Chemistry
Background:
- Two-dimensional gel electrophoresis (2D GE) is a key proteomics technique.
- Silver staining is a common, sensitive method for visualizing protein spots in 2D GE.
- Assessing reproducibility and error is crucial for reliable proteomic data analysis.
Purpose of the Study:
- To investigate the relationship between protein spot volume and variation in 2D gels.
- To determine how protein abundance affects data reproducibility using silver staining.
- To establish a method for accurately assessing significant changes in protein expression.
Main Methods:
- Utilized large-format 2D gels with silver stain technology.
- Employed a model system of mammalian NSO cell extracts.
- Performed multiple gel runs to assess reproducibility.
- Analyzed the correlation between individual protein spot volumes and their coefficients of variation.
Main Results:
- Protein spot volume is directly correlated with the coefficient of variation.
- Reproducibility of 2D GE data is dependent on individual protein spot volumes.
- Low-abundance proteins exhibit the highest coefficients of variation, contributing most to process error.
- Abundant proteins show the lowest coefficients of variation.
Conclusions:
- The inherent limitations of silver staining necessitate the calculation of variation for individual protein spot volumes.
- Global error assessment is insufficient; individual spot volume variation must be considered for accurate analysis of significant protein changes.
- Understanding the spot volume-variation relationship enhances the reliability of proteomics studies using silver-stained 2D gels.