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J. Mol. Micro. Biotechnol. 4: 187-190
Regulation of Succinoglycan and Galactoglucan Biosynthesis in Sinorhizobium meliloti
Anke Becker, Silvia Rüberg, Birgit Baumgarth, Peter Alexander Bertram-Drogatz, Ingmar Quester, and Alfred Pühler
Sinorhizobium meliloti (Rhizobium meliloti) 2011 has the ability to produce the two acidic exopolysaccharides succinoglycan (EPS I) and galactoglucan (EPS II). EPS I is a branched heteropolysaccharide composed of octasaccharide repeating units, whereas EPS II is a linear heteropolysaccharide consisting of disaccharide sub-units. The exo-exs and exp gene clusters are involved in the biosynthesis of EPS I and EPS II, respectively. EPS I and EPS II 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.
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