On the one hand , in low Mg2 + , the PhoP/PhoQ two component regulatory system activates transcription initiation of the mgtCBR operon .
When the PhoP/PhoQ two component system is activated by low Mg transcribes mgtCBR messenger RNAs .
When the PhoP/PhoQ two component system is activated by low Mg binds to the promoter region of the mgtCBR operon .
When the PhoP/PhoQ two component 2 is activated by low Mg transcribes mgtCBR messenger RNAs .
When the PhoP/PhoQ two component 2 is activated by low Mg binds to the promoter region of the mgtCBR operon .