Osmoregulated trehalose-derived oligosaccharides in Sinorhizobium meliloti
Arnaud Brique1, Jimi Devassine, Serge Pilard
1Unité Génie Enzymatique et Cellulaire, UMR CNRS 6022, Université de Picardie Jules Verne, Amiens, France.
Abstract:
Sinorhizobium meliloti is a soil bacterium accumulating glutamate, N-acetylglutaminyl glutamine amide and trehalose in hyperosmolarity. Besides these compatible solutes, we highlighted several compounds in S. meliloti Rm1021 wild-type strain. The purification and the structural characterization based on liquid chromatography evaporative light scattering detector, electrospray ionization high resolution mass spectrometry and nuclear magnetic resonance techniques showed they were four linear oligosaccharides composed of 3, 4, 5 and 6 glucose units all linked by alpha-(1-->2) linkages except a terminal alpha-(1<-->1) linkage. These oligosaccharides were cytoplasmic and were observed in several wild-type strains suggesting they were common features in S. meliloti strains grown in hyperosmolarity.
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