XRE-type transcriptional regulator ProR controls prodigiosin synthesis in Serratia marcescens JNB5-1

The gram-negative bacterium <i>Serratia marcescens</i> produces various secondary metabolites, including prodigiosin, althiomycin, and serratamolide. Among these, prodigiosin exhibits multiple biological activities such as antibacterial, anticancer, and immunosuppressive properties. Nevertheless, our understanding of the regulatory mechanisms governing prodigiosin biosynthesis in <i>S. marcescens</i> remains incomplete. Here, an HTH_XRE family transcription factor, BVG90_RS12600 (designated ProR