Structural characterization of a novel diglycosyl diacylglyceride glycolipid from Rhizobium trifolii ANU843
1992
Orgambide, G.G. | Hollingsworth, R.I. | Dazzo, F.B.
A novel glycolipid was isolated by chloroform-methanol extraction of Rhizobium trifolii ANU843 cells. Compositional analysis, methylation studies, 1H NMR and spectroscopies led to the identification of a diglycosyl diacylglyceride: 1,2-di-O-acyl-3-O[alpha-D-glucopyranosyl-(1 leads to 3)-O-alpha-D-mannopyranosyl]glycerol. Iso-hexadecanoic and anteiso-heptadecanoic acids were the predominant fatty acids esterifying the glyceryl moiety, but a microheterogeneity in fatty acid composition was found, resulting in at least five distinct molecular species of the glycolipid. Although widespread in plants, animals and Gram-positive bacteria, glycosyl glycerides have been seldom reported in Gram-negative bacteria and this work is the first evidence of their occurrence in the bacterial family Rhizobiaceae.
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