Table 1 Comparison of LacZ expression under the control of cysJHp in strains with different threonine-producing capacities
Strains | ThrH(pTZL1) | ThrL(pTZL1) | MG1655(pTZL1) |
|---|---|---|---|
Specific activity of LacZ (U/mg) | 97.30 ± 6.53 | 50.44 ± 0.64 | 47.71 ± 3.21 |
Intracellular threonine concentration (g/L)a | 3.19 ± 0.17 | 0.10 ± 0.02 | 0.10 ± 0.01 |
Extracellular threonine concentration (g/L)b | 5.83 ± 0.02 | Not-detected | Not-detected |