The extracellular proteome of Bacillus subtilis under secretion stress conditions
The accumulation of malfolded proteins in the cell envelope of the Gram-positive eubacterium Bacillus subtilis was previously shown to provoke a so-called secretion stress response. In the present studies, proteomic approaches were employed to identify changes in the extracellular proteome of B. subtilis in response to secretion stress. The data shows that, irrespective of the way in which secretion stress is imposed on the cells, the levels of only two extracellular proteins, HtrA and YqxI, display major variations in a parallel manner. Whereas the extracellular level of the HtrA protease is determined through transcriptional regulation, the level of YqxI in the growth medium is determined post-transcriptionally in an HtrA-dependent manner. In the absence of secretion stress, the extracellular levels of HtrA and YqxI are low because of extracytoplasmic proteolysis. Finally, the protease active site of HtrA is dispensable for post-transcriptional YqxI regulation. It is known that Escherichia coli HtrA has combined protease and chaperone-like activities. As this protein shares a high degree of similarity with B. subtilis HtrA, it can be hypothesized that both activities are conserved in B. subtilis HtrA. Thus, a chaperone-like activity of B. subtilis HtrA could be involved in the appearance of YqxI on the extracellular proteome.
Document Type: Research Article
Affiliations: 1: Department of Genetics, Smurfit Institute and National Pharmaceutical Biotechnology Centre, Trinity College, Dublin 2, Ireland. 2: Department of Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, Kerklaan 30, 9751 NN Haren, the Netherlands. 3: Department of Pharmaceutical Biology, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, the Netherlands. 4: Institut für Mikrobiologie und Molekularbiologie, Ernst-Moritz-Arndt-Universität Greifswald, F. -L. -Jahn-Str. 15, D-17487 Greifswald, Germany.
Publication date: July 1, 2003