Abstract
A rough (R) variant of Streptococcus sanguis strain G26 showing increased in-vitro adherence and a slower growth rate compared with its smooth (S) wild-type strain. Serological comparison revealed no difference in antigenic composition. The R-form was less sensitive to NaCl, NaF and NaN 3 but more sensitive to chlorhexidine. The R-form was more readily transformed than the smooth wild-type. Cells of both phenotypes synthesized α-(1 → 6)-rich, dextran-like glucans and did not appear to produce α-(1 → 3)-rich water insoluble glucans. Furthermore, no significant difference was observed in the caries-producing potential in rats. Tests for cell-bound lipoteichoic acid (LTA) showed that hot phenol extracts of R-cells contained more LTA than did extracts of S-cells. The significance of these findings for increased in vitro adherence of the R-form is discussed.
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