TABLE 1.
Strains and plasmids used in this study
| Strain or plasmid | Relevant characteristic(s)a | Source or reference |
|---|---|---|
| Strains | ||
| Commensals | ||
| S. sanguinis BCC04 | AD (++); antagonism (+) | Clinical strain |
| S. gordonii BCC09 | AD (+++); antagonism (++) | Clinical strain |
| S. cristatus BCC13 | AD (++); antagonism (+++) | Clinical strain |
| S. oralis BCC02 | AD (+); antagonism (+) | Clinical strain |
| S. intermedius BCC01 | AD (+++); antagonism (−) | Clinical strain |
| S. sanguinis SK150 | Wild-type reference strain | Laboratory stock |
| S. mutans | ||
| UA159 | Wild-type reference strain | ATCC |
| UA159-Km | gtfA::Kmr | This study |
| Plasmid | ||
| pBGK2 | Streptococcus integration vector, Kmr | 56 |
a
Five clinical strains (BBC01 to BBC13) were isolated from supragingival dental plaque of caries-free subjects. AD activity and antagonism against S. mutans UA159 in BHI medium was assessed and recorded with the following symbols: −, none; +, low; ++, moderate; +++, high.