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Journal of Clinical Microbiology, Jun 1995, 1584-1587, Vol 33, No. 6
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Analysis of enzymatic activities for differentiation of two species of nutritionally variant streptococci, Streptococcus defectivus and Streptococcus adjacens

D Beighton, KA Homer, A Bouvet and AR Storey
RCS Department of Dental Sciences, Faculty of Clinical Dentistry, King's College School of Medicine and Dentistry, London, United Kingdom.

Strains of nutritionally variant streptococci, Streptococcus defectivus (n = 10) and Streptococcus adjacens (n = 20), were studied for the production of glycosidic and proteolytic enzyme activities. S. defectivus strains produced neuraminidase and alpha-fucosidase, while S. adjacens strains produced only neuraminidase. The S. adjacens strains produced a very wide range of proteolytic activities with the ability to hydrolyze the majority of aminopeptidase substrates tested, while S. defectivus strains hydrolyzed only a minority of aminopeptidase substrates. These data provide additional phenotypic characteristics which may be useful in distinguishing between these two species and suggest that they may have different nutritional requirements.

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