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Originally published In Press as doi:10.1074/mcp.M300074-MCP200 on October 13, 2003.
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Molecular & Cellular Proteomics 3:24-42, 2004.
© 2004 by The American Society for Biochemistry and Molecular Biology, Inc.


Research

Complementary Analysis of the Mycobacterium tuberculosis Proteome by Two-dimensional Electrophoresis and Isotope-coded Affinity Tag Technology *

Frank Schmidt{ddagger}, Samuel Donahoe§, Kristine Hagens, Jens Mattow, Ulrich E. Schaible, Stefan H. E. Kaufmann, Ruedi Aebersold§ and Peter R. Jungblut{ddagger},||

From the {ddagger} Core Facility Protein Analysis and Department of Immunology, Max Planck Institute for Infection Biology, D-10117 Berlin, Germany and the § Institute for Systems Biology, Seattle, Washington 98103-8904

Classical proteomics combined two-dimensional gel electrophoresis (2-DE) for the separation and quantification of proteins in a complex mixture with mass spectrometric identification of selected proteins. More recently, the combination of liquid chromatography (LC), stable isotope tagging, and tandem mass spectrometry (MS/MS) has emerged as an alternative quantitative proteomics technology. We have analyzed the proteome of Mycobacterium tuberculosis, a major human pathogen comprising about 4,000 genes, by (i) 2-DE and mass spectrometry (MS) and by (ii) the isotope-coded affinity tag (ICAT) reagent method and MS/MS. The data obtained by either technology were compared with respect to their selectivity for certain protein types and classes and with respect to the accuracy of quantification. Initial datasets of 60,000 peptide MS/MS spectra and 1,800 spots for the ICAT-LC/MS and 2-DE/MS methods, respectively, were reduced to 280 and 108 conclusively identified and quantified proteins, respectively. ICAT-LC/MS showed a clear bias for high Mr proteins and was complemented by the 2-DE/MS method, which showed a preference for low Mr proteins and also identified cysteine-free proteins that were transparent to the ICAT-LC/MS method. Relative quantification between two strains of the M. tuberculosis complex also revealed that the two technologies provide complementary quantitative information; whereas the ICAT-LC/MS method quantifies the sum of the protein species of one gene product, the 2-DE/MS method quantifies at the level of resolved protein species, including post-translationally modified and processed polypeptides. Our data indicate that different proteomic technologies applied to the same sample provide complementary types of information that contribute to a more complete understanding of the biological system studied.


|| To whom correspondence should be addressed: Core Facility Protein Analysis, Max Planck Institute for Infection Biology, Schumannstr. 21/22, D-10117 Berlin, Germany. E-mail: jungblut{at}mpiib-berlin.mpg.de


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