Abstract
A fast and matrix-assisted laser desorption/ionization mass spectrometry compatible protein staining method in one- and two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis is described. It is based on the counterion dye staining method that employs oppositely charged two dyes, zincon and ethyl violet, to form an ion-pair complex. The protocol, including fixing, staining, and quick washing steps, can be completed in 1–1.5 h, depending upon gel thickness. It has the sensitivity comparable to the colloidal Coomassie Brilliant Blue G stain using phosphoric acid as a component of staining solution (4–8 ng). The counterion dye stain does not induce protein modifications that complicate interpretation of peptide mapping data from mass spectrometry. Considering the speed, sensitivity, and compatibility with mass spectrometry, the counterion dye stain may be more practical than any other dye-based protein stains for routine proteomic researches.
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Acknowledgments
This work was supported by Mid-career Researcher Program through NRF grant funded by the MEST (No. 2010-0000309).
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Cong, WT., Wang, X., Hwang, SY., Jin, LT., Choi, JK. (2012). Counterion Dye Staining of Proteins in One- and Two-Dimensional Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis and Tryptic Gel Digestion of Stained Protein for Mass Spectrometry. In: Kurien, B., Scofield, R. (eds) Protein Electrophoresis. Methods in Molecular Biology, vol 869. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-61779-821-4_44
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DOI: https://doi.org/10.1007/978-1-61779-821-4_44
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Online ISBN: 978-1-61779-821-4
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