OmpR , in response to a drop in pH , induces the expression of ssrA ± ssr .
The OmpR-dependent stimulation of ssrA -- lacZ requires the sensor kinase EnvZ , as the activity of an envZ deletion strain is similar to that of the ompR deletion strain .
OmpR appears to function as an activator of ssrA , as reported previously
L. J. Kenney Fig. 2 suggest that OmpR activates ssrA and , to a lesser extent , SsrB also activates ssrA , whereas both OmpR and SsrB have a significant effect on ssrB .
R. Oropeza suggest that OmpR activates ssrA and , to a lesser extent , SsrB also activates ssrA , whereas both OmpR and SsrB have a significant effect on ssrB .
1134 X. Feng suggest that OmpR activates ssrA and , to a lesser extent , SsrB also activates ssrA , whereas both OmpR and SsrB have a significant effect on ssrB .
How does OmpR activate expression of ssrA ?
Under low osmolality , the ssrA genes are transcriptionally activated by the binding of OmpR ~ P to their promoters whose levels are in turn .
Under acidic pH , the ssrA genes are transcriptionally activated by the binding of OmpR ~ P to their promoters whose levels are in turn .