TABLE 6.
Specific activity of β-galactosidase in lrp+ and lrp strains having a leuPAB′-lacZ translational fusion and grown in media supplemented with dipeptidesa
| Strain | lrp allele | Sp. act. of β-galactosidaseb
|
||
|---|---|---|---|---|
| Leu | Gly Leu | Ala Leu | ||
| CP55 | lrp+ | 470 ± 50 | 31 ± 6 | 124 ± 40 |
| CV1512 | lrp-35::Tn10 | 30 ± 7 | 20 ± 3 | 51 ± 17 |
a
As in legend to Table 2, except that cultures were sometimes supplemented with leucine at 50 μg/ml (Leu), glycyl leucine at 75 μg/m; (Gly Leu) or alanyl leucine at 77 μg/ml (Ala Leu).
b
Specific activity is in Miller units. Values represent the means and standard deviations for multiple samples taken throughout log growth phase from at least two independent experiments.