High MS-compatibility of silver nitrate-stained protein spots from 2-DE gels using ZipPlates and AnchorChips for successful protein identification

Electrophoresis. 2007 May;28(10):1607-14. doi: 10.1002/elps.200600656.

Abstract

The availability of easy-to-handle, sensitive, and cost-effective protein staining protocols for 2-DE, in conjunction with a high compatibility for subsequent MS analysis, is still a prerequisite for successful proteome research. In this article we describe a quick and easy-to-use methodological protocol based on sensitive, homogeneous, and MS-compatible silver nitrate protein staining, in combination with an in-gel digestion, employing the Millipore 96-well ZipPlate system for peptide preparation. The improved quality and MS compatibility of the generated protein digests, as compared to the otherwise weakly MS-compatible silver nitrate staining, were evaluated on real tissue samples by analyzing 192 Coomassie-stained protein spots against their counterparts from a silver-stained 2-DE gel. Furthermore, the applicability of the experimental setup was evaluated and demonstrated by the analysis of a large-scale MALDI-TOF MS experiment, in which we analyzed an additional ~1000 protein spots from 2-DE gels from mouse liver and mouse brain tissue.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Electrophoresis, Gel, Two-Dimensional / methods*
  • Indicators and Reagents / chemistry
  • Mice
  • Peptide Fragments / chemistry
  • Peptide Fragments / isolation & purification
  • Peptide Fragments / metabolism
  • Proteins / analysis*
  • Proteome / analysis
  • Reproducibility of Results
  • Rosaniline Dyes / chemistry*
  • Sensitivity and Specificity
  • Sequence Analysis / methods
  • Silver Nitrate / chemistry*
  • Silver Staining*
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / methods*
  • Trypsin / metabolism

Substances

  • Indicators and Reagents
  • Peptide Fragments
  • Proteins
  • Proteome
  • Rosaniline Dyes
  • Coomassie brilliant blue R
  • Silver Nitrate
  • Trypsin