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Journal of Bacteriology, August 2000, p. 4667-4669, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Dual Functions of Streptococcus salivarius Urease

Yi-Ywan M. Chen, Cheryl A. Weaver, and Robert A. Burne*

Center for Oral Biology and Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York 14642

Received 13 March 2000/Accepted 18 May 2000

A urease-deficient derivative of Streptococcus salivarius 57.I was constructed by allelic exchange at the ureC locus. The wild-type strain was protected against acid killing through hydrolysis of physiologically relevant concentrations of urea, whereas the mutant was not. Also, S. salivarius could use urea as a source of nitrogen for growth exclusively through a urease-dependent pathway.

* Corresponding author. Mailing address: Center for Oral Biology, University of Rochester Medical Center, 601 Elmwood Ave., Rochester, NY 14642. Phone: (716) 275-0381. Fax: (716) 473-2679. E-mail: robert_burne{at}urmc.rochester.edu.

Journal of Bacteriology, August 2000, p. 4667-4669, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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