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Journal of Bacteriology, November 2006, p. 7765-7777, Vol. 188, No. 22
0021-9193/06/$08.00+0 doi:10.1128/JB.00774-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Reporter Metabolite Analysis of Transcriptional Profiles of a Staphylococcus aureus Strain with Normal Phenotype and Its Isogenic hemB Mutant Displaying the Small-Colony-Variant Phenotype
,
Jochen Seggewiß,1
Karsten Becker,1
Oliver Kotte,2
Martin Eisenacher,3
Mohammad Reza Khoschkhoi Yazdi,1
Andreas Fischer,1
Peter McNamara,4
Nahed Al Laham,1
Richard Proctor,4
Georg Peters,1
Matthias Heinemann,2 and
Christof von Eiff1*
Institute of Medical Microbiology, University of Münster, Münster, Germany,1
Institute of Molecular Systems Biology, ETH Zürich, Zürich, Switzerland,2
Integrated Functional Genomics (IFG), Interdisciplinary Center for Clinical Research (IZKF), University of Münster, Münster, Germany,3
Department of Medical Microbiology and Immunology, University of Wisconsin Medical School, Madison, Wisconsin4
Received 30 May 2006/
Accepted 24 August 2006
In this study, full-genome DNA microarrays based on the sequence of Staphylococcus aureus N315 were used to compare the transcriptome of a clinical S. aureus strain with a normal phenotype to that of its isogenic mutant with a stable small-colony-variant (SCV) phenotype (hemB::ermB). In addition to standard statistical analyses, systems biology advances were applied to identify reporter metabolites and to achieve a more detailed survey of genome-wide expression differences between the hemB mutant and its parental strain. Genes of enzymes involved in glycolytic and fermentative pathways were found to be up-regulated in the hemB mutant. Furthermore, our analyses allowed identification of additional differences between the normal-phenotype S. aureus and the SCV, most of which were related to metabolism. Profound differences were identified especially in purine biosynthesis as well as in arginine and proline metabolism. Of particular interest, a hypothetical gene of the Crp/Fnr family (SA2424) that is part of the arginine-deiminase (AD) pathway, whose homologue in Streptococcus suis is assumed to be involved in intracellular persistence, showed significantly increased transcription in the hemB mutant. The hemB mutant potentially uses the up-regulated AD pathway to produce ATP or (through ammonia production) to counteract the acidic environment that prevails intracellularly. Moreover, genes involved in capsular polysaccharide and cell wall synthesis were found to be significantly up-regulated in the hemB mutant and therefore potentially responsible for the changed cell morphology of SCVs. In conclusion, the identified differences may be responsible for the SCV phenotype and its association with chronic and persistent infections.
* Corresponding author. Mailing address: Institute of Medical Microbiology, University Hospital of Münster, Domagkstr. 10, 48149 Münster, Germany. Phone: 49-251-83-55360. Fax: 49-251-83-55350. E-mail:
eiffc{at}uni-muenster.de.
Published ahead of print on 15 September 2006.
Supplemental material for this article may be found at http://jb.asm.org/.
Journal of Bacteriology, November 2006, p. 7765-7777, Vol. 188, No. 22
0021-9193/06/$08.00+0 doi:10.1128/JB.00774-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
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