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標題: Conductive carbon tape as a sample platform for microwave-based MALDI MS detection of proteins and phosphoproteins
作者: Juang, Yu-Min
Chen, Chao-Jung
Lai, Chien-Chen
關鍵字: Carbon tape;Microwave-assisted protein preparation and digestion;Protein identification;Phosphopeptide;MALDI;Enrichment;desorption/ionization mass-spectrometry;magnetic particles;rapid;enrichment;phosphorylated peptides;concentrating probes;selective;enri
Project: Analytical and Bioanalytical Chemistry, Volume 401, Issue 4, Page(s) 1219-1229.
In this study, we developed a novel microwave-assisted protein preparation and digestion method for matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry analysis and identification of proteins that involves using conductive carbon tape as a sample platform for sample preparation (reduction and alkylation) and digestion under microwave heating and as a plate for MALDI analysis. This method allows for the enzymatic digestion products of proteins to be directly analyzed by MALDI mass spectrometry and results in a marked reduction in sample loss. Our protocol requires only a small volume (1 mu L) of reaction solvent, which increases the frequency of enzyme-to-protein contact, thereby resulting in more efficient digestion of sample than conventional in-solution digestion methods. To test this protocol, we used magnetic iron (II, III) oxide nanoparticles as concentrating probes to enrich phosphopeptides from a mixture of peptides in enzymatically digested protein samples. We found that the one-pot on-tape-based protein preparation and digestion under microwave heating combined with the on-tape-based enrichment method not only dramatically reduced the time required for phosphopeptides analysis but also allowed for the simultaneous identification of phosphoproteins. The advantages of our protocol include ease of use, high digestion efficiency, high specificity, and rapid (15 min) identification of proteins and enrichment of phosphopeptides in a mixture of enzymatically digested protein samples.
ISSN: 1618-2642
DOI: 10.1007/s00216-011-5198-6
Appears in Collections:分子生物學研究所

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