However , phoP mutations did not affect induction of data not shown , indicating that it operates independently of the PhoPQ regulon .
However , phoP mutations did not affect induction of the proposed pathway , indicating that it operates independently of the PhoPQ regulon .
In the comparison of tolC strains in an Mg2-free buffer , the PhoPQ-activated modifica tions resulted in a more-than-fourfold increase in the barrier function against the penetration of a cationic dye , ethidium , in comparison with the phoP null mutant , in which the modification was absent ( Fig. 2 , left panel ) .
the phagosome turns on various acid response genes provide protection against very low pH levels .31 The PhoPQ system is involved in controlling induction of the acid response genes and , not surprisingly , the phoP single mutant