The high-affinity phosphate-binding protein PstS is accumulated under high fructose concentrations and mutation of the corresponding gene affects differentiation in Streptomyces lividans

• Published in: Microbiology (Society for General Microbiology) 2005-08, Vol.151 (8), p.2583-2592
• Main Authors: Diaz, Margarita, Esteban, Ana, Fernandez-Abalos, Jose Manuel, Santamaria, Ramon I
• Format: Article
• Language: English
• Subjects: Bacteriology; Binding Sites; Biological and medical sciences; Cell Differentiation - drug effects; Fructose - pharmacology; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Bacterial - drug effects; Genes, Regulator; Growth, nutrition, cell differenciation; Microbiology; Molecular Sequence Data; Mutation; Phosphate-Binding Proteins - genetics; Phosphate-Binding Proteins - metabolism; Phosphate-Binding Proteins - physiology; Phosphates - metabolism; Streptomyces lividans - cytology; Streptomyces lividans - drug effects; Streptomyces lividans - genetics; Streptomyces lividans - metabolism
• ISSN: 1350-0872; 1465-2080
• DOI: 10.1099/mic.0.27983-0

Instituto de Microbiología Bioquímica/Departamento de Microbiología y Genética, Consejo Superior de Investigaciones Científicas (CSIC)/Universidad de Salamanca, Edificio Departamental, Campus Miguel de Unamuno, 37007 Salamanca, Spain Correspondence Ramón I. Santamaría santa{at}usal.es The secreted protein pattern of Streptomyces lividans depends on the carbon source present in the culture media. One protein that shows the most dramatic change is the high-affinity phosphate-binding protein PstS, which is strongly accumulated in the supernatant of liquid cultures containing high concentrations (>3 %) of certain sugars, such as fructose, galactose and mannose. The promoter region of this gene and that of its Streptomyces coelicolor homologue were used to drive the expression of a xylanase in S. lividans that was accumulated in the culture supernatant when grown in the presence of fructose. PstS accumulation was dramatically increased in a S. lividans polyphosphate kinase null mutant ( ppk ) and was impaired in a deletion mutant lacking phoP , the transcriptional regulator gene of the two-component phoR-phoP system that controls the Pho regulon. Deletion of the pstS genes in S. lividans and S. coelicolor impaired phosphate transport and accelerated differentiation and sporulation on solid media. Complementation with a single copy in a S. lividans pstS null mutant returned phosphate transport and sporulation to levels similar to those of the wild-type strain. The present work demonstrates that carbon and phosphate metabolism are linked in the regulation of genes and that this can trigger the genetic switch towards morphogenesis. The GenBank/EMBL/DDBJ accession number for the sequence of the S. lividans pstS gene reported in this paper is AJ698727 .