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The extracellular and cytoplasmic proteomes of the non-virulent Bacillus anthracis strain UM23C1-2

Lookup NU author(s): Rachel Williams, Professor Anil Wipat, Professor Colin Harwood

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Abstract

The recently published genome sequence of Bacillus anthracis Ames has facilitated the prediction of proteins associated with the virulence of this bacterium. The aim of this study was to define reference maps for the extracellular and cytoplasmic proteomes of the avirulent B. anthracis strain UM23C1-2 that are useful for physiological studies and the development of improved vaccines. Using 2-DE and subsequent MALDI-TOF-TOF MS, 64 proteins were identified in the extracellular proteome, only 29 of which were predicted to be exported into the culture medium. The latter included chitinases, proteases, nucleotidases, sulfatases, phosphatases and proteins of unknown function. Of the remaining proteins in the culture medium, 18 were predicted to be associated with the cell wall or anchored on the trans side of the cytoplasmic membrane while 17 other proteins lacked identifiable export signals and were predicted to be cytoplasmic proteins. Among the S-layer proteins, Sap and Eag account for 10% of the total extracellular proteome. Many of the proteins are predicted to contribute to the virulence and antigenic signature of B. anthracis. We have also studied the composition of the cytoplasmic proteome, identifying 300 distinct proteins. The most abundant cytoplasmic proteins are primarily those involved in glycolysis, amino acid metabolism, protein translation, protein folding and stress adaptation. The presence of a variety of proteases, peptidases, peptide binding proteins, as well as enzymes required for the metabolism of amino acids, suggests that B. anthracis is adapted to life in a protein-rich environment rather than the soil. We therefore speculate that proteases and peptidases could be useful targets for the development of improved vaccines. In addition, both of these B. anthracis compartment-specific proems can be used as reference maps to monitor changes in the production of secreted and cytosolic proteins that occur, for example, during growth in macrophages. © 2005 Wiley-VCH Verlag GmbH & Co. KGaA.


Publication metadata

Author(s): Antelmann H, Williams RC, Miethke M, Wipat A, Albrecht D, Harwood CR, Hecker M

Publication type: Article

Publication status: Published

Journal: Proteomics

Year: 2005

Volume: 5

Issue: 14

Pages: 3684-3695

Print publication date: 01/09/2005

ISSN (print): 1615-9853

ISSN (electronic): 1615-9861

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1002/pmic.200401218

DOI: 10.1002/pmic.200401218

PubMed id: 16121336


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