Intracellular induction of HA-tagged PipB expression is not detected for an SsrB mutant ( ssrB : : kan ) .
SsrB , in turn , activates ssrB .
SsrB , in turn , activates ssrB .
These results demonstrated that SsrB is necessary to activate the ssrB promoter even in the absence of PmrA repression .
Because the putative 19-bp Fur box is located only 5 bp because Fur binds to regions larger than the Fur box , it is possible that the Fur repressor competes with the SsrB activator for binding to the ssrB promoter .
Because the putative 19-bp Fur box is located only 5 bp upstream of the SsrB binding site on Fig. 4A binds to regions larger than the Fur box , it is possible that the Fur repressor competes with the SsrB activator for binding to the ssrB promoter .
Because the putative 19-bp Fur box is located only 5 bp upstream of the SsrB binding site on the ssrB promoter binds to regions larger than the Fur box , it is possible that the Fur repressor competes with the SsrB activator for binding to the ssrB promoter .