Becker A, Rüberg S, Baumgarth B, Bertram-Drogatz PA, Quester I, Pühler A. Regulation of succinoglycan and galactoglucan biosynthesis in Sinorhizobium meliloti. JOURNAL OF MOLECULAR MICROBIOLOGY AND BIOTECHNOLOGY. 2002;4(3):187-190.Sinorhizobium meliloti (Rhizobium meliloti) 2011 has the ability to produce the two acidic exopolysaccharides succinoglycan (EPSI) and galactoglucan (EPSII). EPSI is a branched heteropolysaccharide composed of octasaccharide repeating units, whereas EPSII is a linear heteropolysaccharide consisting of disaccharide subunits. The exo-exs and exp gene clusters are involved in the biosynthesis of EPSI and EPSII, respectively. EPSI and EPSII biosynthesis genes are differentially expressed resulting in a complex regulation of EPS production in S. meliloti. The phosphate concentration was identified as an Important factor affecting the expression of exp genes
