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Journal of Bacteriology, December 2003, p. 6928-6937, Vol. 185, No. 23
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.23.6928-6937.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Physiological Characterization of a Heme-Deficient Mutant of Staphylococcus aureus by a Proteomic Approach

Christian Kohler,1 Christof von Eiff,2 Georg Peters,2 Richard A. Proctor,3,4 Michael Hecker,1 and Susanne Engelmann1*

Institut für Mikrobiologie, Universität Greifswald, 17487 Greifswald,1 Institut für Medizinische Mikrobiologie, Universitätsklinikum Münster, 48149 Münster, Germany,2 Department of Medical Microbiology and Immunology,3 Department of Medicine, University of Wisconsin Medical School, Madison, Wisconsin4

Received 15 May 2003/ Accepted 5 September 2003

The high-resolution two-dimensional (2D) protein gel electrophoresis technique combined with matrix-assisted laser desorption ionization-time of flight mass spectrometry was used for identification of proteins whose levels were changed by a mutation in hemB. Cytoplasmic protein extracts obtained from the mutant and the wild type (strain COL) at different stages of growth in tryptone soya broth (exponential, transitional, and stationary growth phases) were separated on 2D protein gels. Comparison of the 2D patterns of the protein extracts of the two strains revealed major differences. Because the electron transport chain of the mutant is interrupted due to the deficiency of heme, this organism should be unable to use oxygen or nitrate as a terminal electron acceptor. Consistent with this hypothesis, proteins involved in the glycolytic pathway and related pathways (glyceraldehyde-3-phosphate dehydrogenase, enolase, and phosphoglycerate kinase) and in fermentation pathways (lactate dehydrogenase, alcohol dehydrogenase, and pyruvate formate lyase) were induced in exponentially growing cells of the mutant. These results strongly indicate that the hemB mutant generates ATP from glucose or fructose only by substrate phosphorylation. Analyses of the fermentation reactions showed that the main product was lactate. Although pyruvate formate lyase (Pfl) and pyruvate dehydrogenase were present, neither ethanol nor acetate was detected in significant amounts. Presumably, Pfl was not activated in the presence of oxygen, and pyruvate dehydrogenase might have very low activity. Transcriptional analysis of citB, encoding the aconitase, revealed that the activity of the citrate cycle enzymes was down-regulated in the hemB mutant. The arginine deiminase pathway was also induced, and it could provide ATP as well. Furthermore, the amounts of most of the extracellular virulence factors were significantly reduced by a mutation in hemB, which is consistent with previous reports.

* Corresponding author. Mailing address: Institut für Mikrobiologie, Universität Greifswald, Jahnstrasse 15, 17487 Greifswald, Germany. Phone: 49-3834-864227. Fax: 49-3834-864202. E-mail: Susanne.Engelmann{at}uni-greifswald.de.

Journal of Bacteriology, December 2003, p. 6928-6937, Vol. 185, No. 23
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.23.6928-6937.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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