The mycobacterial SenX3-RegX3 two-component system consists of the SenX3 sensor histidine kinase and its cognate RegX3 response regulator. This system is a phosphorelay-based regulatory system involved in sensing environmental P levels and induction of genes required for P acquisition under P-limiting conditions. Here we demonstrate that overexpression of the kinase domain of PknB (PknB-KD) inhibits the transcriptional activity of RegX3 of both and (RegX3 and RegX3, respectively).
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