The gene pmrD is transcriptionally activated by the PhoPQ system .
PhoPQ activates the expression of pmrD .
PhoPQ activates pmrD in both E. coli
PhoPQ activates pmrD in both S. Typhimurium
Upon activation , PhoPQ increases the transcription of pmrD .
Under limitation , the PhoPQ system induces pmrD expression .
Under Mg2 , the PhoPQ system induces pmrD expression .
In S. Typhimurium , the PhoPQ TCS indirectly activates the PmrAB TCS via PhoP-activated pmrD expression .