J Biol Chem 2004, 279:9064–9071.PubMedCrossRef 32. Mellies JL, Haack KR, Galligan DC: SOS regulation of the type III secretion system of enteropathogenic Escherichia coli . J Bacteriol 2007, 189:2863–2872.PubMedCrossRef 33. Justice SS, Hung C, Theriot JA, Fletcher

DA, Anderson GG, Footer MJ, Hultgren SJ: Differentiation and developmental pathways of uropathogenic Escherichia coli in urinary tract pathogenesis. Proc Natl Acad Sci USA 2004, 101:1333–1338.PubMedCrossRef 34. Dörr T, Lewis K, Vulić M: SOS response induces persistence to fluoroquinolones in Escherichia coli . PLoS Genetics 2009, 5:1–9.CrossRef 35. Keseler IM, Bonavides-Martinez C, Collado-Vides J, Gama-Castro S, Gunsalus RP, Johnson DA, Krummenacker M, Nolan LM, Paley S, Paulsen IT, et al.: EcoCyc: a comprehensive view of Escherichia coli biology. Nucleic Acids PRI-724 chemical structure Res 2009, 37:D464–470.PubMedCrossRef 36. Salles B, Weisemann JM, Weinstock GM: Temporal control of colicin E1 induction.

J Bacteriol 1987, 169:5028–5034.PubMed MRT67307 solubility dmso 37. Salles B, Weinstock GM: Interaction of the CRP-cAMP complex with the cea regulatory region. Mol Gen Genet 1989, 215:537–542.PubMedCrossRef 38. Chant EL, Summers DK: Indole signaling contributes to the stable maintenance of Escherichia coli multicopy plasmids. Mol Microbiol 2007, 63:35–43.PubMedCrossRef Authors’ contributions SK performed all experiments. ZP contributed to analysis of the results. OG and DŽB participated in the design of the experiments and SK, OG and DŽB in preparation of the SB-715992 molecular weight manuscript. All authors read and approved the final manuscript.”
“Background Nitrogen-fixing symbiotic bacteria, commonly known as rhizobia, employ a variety of strategies which allow them to exist in the soil and adapt to various environmental conditions

prior to infecting leguminous plant hosts. Rhizobial cell surface components, exopolysaccharide (EPS) and lipopolysaccharide (LPS), play an important role in determining the symbiotic competence of rhizobia, root tissue invasion and induction of nitrogen-fixing nodules on host plants forming indeterminate-type nodules, such as Pisum, Trifolium, Vicia, and Medicago spp. [1–4]. Acidic EPSs secreted in large amounts by rhizobia Fludarabine in vitro are species-specific compounds consisting of common sugars substituted with non-carbohydrate residues [1, 4–6]. EPS of Rhizobium leguminosarum is a heteropolymer consisting of octasaccharide subunits composed of five glucose residues, one galactose, and two glucuronic acid residues, additionally decorated with acetyl, pyruvyl, and 3-hydroxybutyryl groups [7, 8]. EPS-deficient mutants or those with an altered LPS structure are impaired in nodule cell invasion and nitrogen fixation [1, 6, 9–11]. Biosynthesis of EPS in R. leguminosarum is a multi-step process requiring the expression of several pss genes, located in the major EPS cluster on the chromosome [12, 13].