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Originally published In Press as doi:10.1074/mcp.M600069-MCP200 on March 21, 2006.
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Molecular & Cellular Proteomics 5:1183-1192, 2006.
© 2006 by The American Society for Biochemistry and Molecular Biology, Inc.

Research

Gel-free and Gel-based Proteomics in Bacillus subtilis

A Comparative Study*,S

Susanne Wolff{ddagger}, Andreas Otto{ddagger}, Dirk Albrecht{ddagger}, Jianru Stahl Zeng§, Knut Büttner{ddagger}, Matthias Glückmann§, Michael Hecker{ddagger} and Dörte Becher{ddagger},¶

From the {ddagger} Institute for Microbiology, Ernst-Moritz-Arndt-Universität, D-17487 Greifswald, Germany and § Applied Biosystems, D-64293 Darmstadt, Germany

The proteome of exponentially growing Bacillus subtilis cells was dissected by the implementation of shotgun proteomics and a semigel-based approach for a particular exploration of membrane proteins. The current number of 745 protein identifications that was gained by the use of two-dimensional gel electrophoresis could be increased by 473 additional proteins. Therefore, almost 50% of the 2500 genes expressed in growing B. subtilis cells have been demonstrated at the protein level. In terms of exploring cellular physiology and adaptation to environmental changes or stress, proteins showing an alteration in expression level are of primary interest. The large number of vegetative proteins identified by gel-based and gel-free approaches is a good starting point for comparative physiological investigations. For this reason a gel-free quantitation with the recently introduced iTRAQTM (isobaric tagging for relative and absolute quantitation) reagent technique was performed to investigate the heat shock response in B. subtilis. A comparison with gel-based data showed that both techniques revealed a similar level of up-regulation for proteins belonging to well studied heat hock regulons (SigB, HrcA, and CtsR). However, additional datasets have been obtained by the gel-free approach indicating a strong heat sensitivity of specific enzymes involved in amino acid synthesis.

To whom correspondence should be addressed: Inst. for Microbiology, Ernst-Moritz-Arndt-University Greifswald, Friedrich-Ludwig-Jahn-Str. 15, D-17487 Greifswald, Germany. Tel.: 49-3834-864208; Fax: 49-3834-864202; E-mail: dbecher{at}uni-greifswald.de


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