Culture condition | Glutamine synthetase (GS) U mg∙prot−1 | O-acetylserine(thiol)lyase (OASTL) U mg∙prot−1 |
Sufficient | 2.1 ± 0.4 | 3.1 ± 0.28 |
N-starved | 4.3 ± 0.5 | 0.3 ± 0.04 |
S-starved | 2.4 ± 0.5 | 15.8 ± 1.62 |