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Expression of genes of the Pho regulon is altered in Streptomyces coelicolor.

Scientific reports (2020-05-24)
Aaron Millan-Oropeza, Céline Henry, Clara Lejeune, Michelle David, Marie-Joelle Virolle
ABSTRACT

Most currently used antibiotics originate from Streptomycetes and phosphate limitation is an important trigger of their biosynthesis. Understanding the molecular processes underpinning such regulation is of crucial importance to exploit the great metabolic diversity of these bacteria and get a better understanding of the role of these molecules in the physiology of the producing bacteria. To contribute to this field, a comparative proteomic analysis of two closely related model strains, Streptomyces lividans and Streptomyces coelicolor was carried out. These strains possess identical biosynthetic pathways directing the synthesis of three well-characterized antibiotics (CDA, RED and ACT) but only S. coelicolor expresses them at a high level. Previous studies established that the antibiotic producer, S. coelicolor, is characterized by an oxidative metabolism and a reduced triacylglycerol content compared to the none producer, S. lividans, characterized by a glycolytic metabolism. Our proteomic data support these findings and reveal that these drastically different metabolic features could, at least in part, due to the weaker abundance of proteins of the two component system PhoR/PhoP in S. coelicolor compared to S. lividans. In condition of phosphate limitation, PhoR/PhoP is known to control positively and negatively, respectively, phosphate and nitrogen assimilation and our study revealed that it might also control the expression of some genes of central carbon metabolism. The tuning down of the regulatory role of PhoR/PhoP in S. coelicolor is thus expected to be correlated with low and high phosphate and nitrogen availability, respectively and with changes in central carbon metabolic features. These changes are likely to be responsible for the observed differences between S. coelicolor and S. lividans concerning energetic metabolism, triacylglycerol biosynthesis and antibiotic production. Furthermore, a novel view of the contribution of the bio-active molecules produced in this context, to the regulation of the energetic metabolism of the producing bacteria, is proposed and discussed.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Urea, powder, BioReagent, for molecular biology, suitable for cell culture
Sigma-Aldrich
Thiourea, ACS reagent, ≥99.0%
Sigma-Aldrich
Glycerol Assay Kit, sufficient for 200 colorimetric or fluorometric tests
Supelco
Glucose (HK) Assay Kit, sufficient for 20 assays
Sigma-Aldrich
Protease Inhibitor Cocktail powder, for use with bacterial cell extracts, lyophilized powder
Sigma-Aldrich
Phosphate Colorimetric Kit, sufficient for 500 colorimetric tests