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Journal of Bacteriology, October 2004, p. 6383-6390, Vol. 186, No. 19
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.19.6383-6390.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Adaptive Acid Tolerance Response of Streptococcus sobrinus

Marcelle M. Nascimento,1,2 José A. C. Lemos,2 Jacqueline Abranches,2 Reginaldo B. Gonçalves,1 and Robert A. Burne2*

Department of Oral Diagnostics, Dental School of Piracicaba, University of Campinas, Piracicaba, São Paulo, Brazil,1 Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida2

Received 27 April 2004/ Accepted 8 July 2004

Streptococcus mutans and Streptococcus sobrinus are the bacteria most commonly associated with human dental caries. A major virulence attribute of these and other cariogenic bacteria is acid tolerance. The acid tolerance mechanisms of S. mutans have begun to be investigated in detail, including the adaptive acid tolerance response (ATR), but this is not the case for S. sobrinus. An analysis of the ATR of two S. sobrinus strains was conducted with cells grown to steady state in continuous chemostat cultures. Compared with cells grown at neutral pH, S. sobrinus cells grown at pH 5.0 showed an increased resistance to acid killing and were able to drive down the pH through glycolysis to lower values. Unlike what is found for S. mutans, the enhanced acid tolerance and glycolytic capacities of acid-adapted S. sobrinus were not due to increased F-ATPase activities. Interestingly though, S. sobrinus cells grown at pH 5.0 had twofold more glucose phosphoenolpyruvate:sugar phosphotransferase system (PTS) activity than cells grown at pH 7.0. In contrast, glucose PTS activity was actually higher in S. mutans grown at pH 7.0 than in cells grown at pH 5.0. Silver staining of two-dimensional gels of whole-cell lysates of S. sobrinus 6715 revealed that at least 9 proteins were up-regulated and 22 proteins were down-regulated in pH 5.0-grown cells compared with cells grown at pH 7.0. Our results demonstrate that S. sobrinus is capable of mounting an ATR but that there are critical differences between the mechanisms of acid adaptation used by S. sobrinus and S. mutans.

* Corresponding author. Mailing address: Department of Oral Biology, University of Florida, College of Dentistry, P.O. Box 100424, Gainesville, FL 32610. Phone: (352) 392-4370. Fax: (352) 392-7357. E-mail: rburne{at}dental.ufl.edu.

Journal of Bacteriology, October 2004, p. 6383-6390, Vol. 186, No. 19
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.19.6383-6390.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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