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TCSs help bacteria adapt to environmental stresses by altering gene expression. However, the roles and corresponding regulatory mechanisms of most TCSs in theStreptomyces model strainS. coelicolor are unknown. We investigated the previously uncharacterized MacRS TCS and identified the core DNA recognition sequence, two seven-nucleotide inverted repeats, for the DNA-binding protein MacR. We further found that MacR directly controls a group of membrane proteins, including MmpA-C, which are novel morphogenic factors that delay formation of aerial mycelium. We also discovered that these membrane proteins interact with one another and that otherStreptomyces species have conserved MacRS homologs. Our findings suggest a conserved role for MacRS in morphogenesis and/or other membrane-associated activities. Additionally, our study showed that MacRS impacts, albeit indirectly, the production of the signature metabolite actinorhodin, further suggesting that MacRS and its homologs function as novel pleiotropic regulatory systems inStreptomyces .

applied and environmental microbiology

Novel Two-Component System MacRS Is a Pleiotropic Regulator That Controls Multiple Morphogenic Membrane Protein Genes in <i>Streptomyces coelicolor</i>

Novel Two-Component System MacRS Is a Pleiotropic Regulator That Controls Multiple Morphogenic Membrane Protein Genes in Streptomyces coelicolor