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Infect Immun, August 1998, p. 4004-4007, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Synthesis of Microcapsule by Staphylococcus aureus Is Not Responsive to Environmental Phosphate Concentrations

Karen F. Fox,1 George C. Stewart,2 * and Alvin Fox1

Department of Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina,1 and Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas2

Received 30 March 1998/Returned for modification 4 May 1998/Accepted 3 June 1998

The polysaccharide microcapsule of Staphylococcus aureus has been reported to be differentially expressed depending on growth conditions, with phosphate concentration being the critical environmental component. This study evaluated the effect of growth of a serotype 8 strain of S. aureus in phosphate-replete and phosphate-limiting media on microcapsule production. The presence of the cell wall polymers microcapsule and teichoic acid was measured by both gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry. Production of microcapsule was unaffected by changes in the environmental phosphate concentration. There was, additionally, no evidence for a shift from teichoic acid to teichuronic acid synthesis.

* Corresponding author. Mailing address: Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, 1800 Denison Ave., Manhattan, KS 66506. Phone: (785) 532-4419. Fax: (785) 532-4039. E-mail: stewart{at}vet.ksu.edu.

Infect Immun, August 1998, p. 4004-4007, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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