We have investigated the transcriptional regulation and the interaction of the response regulator PhoP with the promoter regions of the PhoP-activated loci phoPQ , mgtA , slyB , pmrD , pcgL , phoN , pagC , and mgtCB .
PhoP-suppressed genes include prgH and fliC [ 55 -- 57 ] , PhoP-activated genes include pmrAB , another two-component signal transduction system involved primarily in the protection of Salmo-nella to cationic antimicrobial peptides ( CAMP , see below ) [ 58 ] , mgtA and mgtCB encoding Mg transport 2 + systems , phoN , a periplasmic non-specific acid phospha-tase , pcgL encoding a periplasmic D-Ala -- D-Ala dipeptidase , or pagL , pagP and pgtE which contribute to increased resistance to CAMPs [ 59 -- 62 ] .