MALDI MS peptide mapping performance by in-gel digestion on a probe with prestructured sample supports

Analytical Chemistry
Tina Guldberg KlenøOle Nørregaard Jensen

Abstract

Matrix-assisted laser desorption/ionization (tandem) mass spectrometry (MALDI MS) is widely used in protein chemistry and proteomics research for the identification and characterization of proteins isolated by polyacrylamide gel electrophoresis. In an effort to minimize sample handling and increase sample throughput, we have developed a novel in-gel digestion protocol where sample preparation is performed directly on a MALDI probe with prestructured sample support. The protocol consists of few sample-handling steps and has minimal consumption of reagents, making the protocol sensitive, timesaving, and cost-efficient. Performance of the on-probe sample preparation protocol was demonstrated by analysis of a set of rat liver proteins obtained from a fluorescently stained (Cy3 and SyproRuby) two-dimensional polyacrylamide gel. The success rate of protein identification by on-probe tryptic digestion and MALDI peptide mass mapping was 89%. The on-probe in-gel digestion procedure provided superior sensitivity and peptide mass mapping performance as compared to our standard in-gel digestion protocol. The on-probe digestion technique resulted in significantly improved amino acid sequence coverage of proteins, mainly due to efficient rec...Continue Reading

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Citations

Mar 19, 2009·Proteomics·Petri KouvonenGarry L Corthals
Jan 22, 2011·Mass Spectrometry Reviews·Pawel L UrbanRenato Zenobi
Sep 17, 2004·Biomarkers : Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals·T G KlenøU G Sidelmann
Feb 18, 2010·Trends in Analytical Chemistry : TRAC·Tingting Tu, Michael L Gross
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Oct 13, 2007·Journal of Proteome Research·Malcolm S Ball, Peter Karuso
Jul 25, 2007·Chemical Reviews·Gert Lubec, Leila Afjehi-Sadat

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