Osmoregulated trehalose‐derived oligosaccharides in Sinorhizobium meliloti

Arnaud Brique (1) , Jimi Devassine (1) , Serge Pilard (2) , Dominique Cailleu (2) , Isabelle Gosselin (1)

1 GEC - Génie Enzymatique et Cellulaire
2 PFA - Plateforme Analytique - UPJV

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 α-(1→2) linkages except a terminal α-(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.

Mots clés: Oligosaccharide; Hyperosmolarity; Trehalose; Metabolism; Sinorhizobium meliloti

Domaines: Chimie

Arnaud Brique, Jimi Devassine, Serge Pilard, Dominique Cailleu, Isabelle Gosselin. Osmoregulated trehalose‐derived oligosaccharides in Sinorhizobium meliloti. FEBS Letters, 2010, 584 (16), pp.3661-3666. ⟨10.1016/j.febslet.2010.07.047⟩. ⟨hal-00516824⟩