TABLE 5.
Factors regulating the expression of the colicin E1 (8) and colicin K activity genes
| Factor | Colicin E1 expressiona | Colicin K expressiona |
|---|---|---|
| SOS response | + | + |
| Induction in stationary phase | + | + |
| Kinetics of induction | Rapid | Slow |
| Expression in conditioned medium versus fresh LB medium | The same | Higher |
| Stringent response | + | + |
| Catabolite repression | + | − |
| Anaerobic expression | + | ± |
| IHF inhibition | − | + |
| RpoS-dependent expression | − | − |
| Lrp-dependent expression | − | − |
a
+, the tested factor influenced expression; −, no influence was found; ±, no increase in expression under anaerobic conditions was found without SOS induction.