TABLE 3.
Noncomplementation of mutT1 by ytkD
| Bacterial strain | Plasmid | Mutation frequenciesa
|
|
|---|---|---|---|
| Streptomycin resistant | Nalidixin resistant | ||
| TX48 (wild type)b | <1 | <1 | |
| SB3 (mutT1) | pTrc99A | 1997 ± 873 | 624 ± 49 |
| SB3 (mutT1) | pTrcMutT | <1 | <1 |
| SB3 (mutT1) | pTrcYtkD | 2526 ± 770 | 529 ± 228 |
a
Number of colonies resistant to streptomycin (120 μg/ml) or nalidixic acid (25 μg/ml) per 109 cells. Values are the means and average deviations of the means of three determinations.
b
TX48 is the wild-type parent of SB3 (5).