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Parallel post-source decay for increasing protein identification confidence levels from 2D gels

  • Åsa Wåhlander
  • Giorgio Arrigoni
  • Martin Snel
  • Ulf Hellman
  • Peter James
Publishing year: 2008
Language: English
Pages: 1771-1779
Publication/Series: Proteomics
Volume: 8
Issue: 9
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

Peptide mass fingerprinting (PMF) has over the years become one of the most commonly used tools for high-throughput analysis and identification of proteins. This method is applicable when relatively simple samples have to be analysed and it is commonly used for analysing proteins previously separated by 2-DE. The most common type of instrument used for this approach is the MALDI-TOF that has proved to be particularly suitable for the PMF analysis because of its characteristics of speed, robustness, sensitivity and automation. We have used a MALDI-TOF equipped with a novel parallel PSD capability (MALDI micro MX), to perform the analysis of two sets of different biological samples isolated by 2-DE. By using a method that integrates the data obtained by PMF analysis with the PSD data obtained in the same experiment, we show that the new multiplexed PSD solution increases the protein identification rate compared to the normal PMF approach. We also investigated the use of a charge-directed fragmentation modification reagent to improve the identification rate and confidence levels.


  • Immunology in the medical area


  • ISSN: 1615-9861
Peter James
E-mail: peter [dot] james [at] immun [dot] lth [dot] se


Department of Immunotechnology

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