The Structure of Lipid A of the Lipopolysaccharide from Burkholderia caryophylli with a 4‐Amino‐4‐deoxy‐L‐arabinopyranose 1‐Phosphate Residue Exclusively in Glycosidic Linkage

Abstract
From the lipopolysaccharides (LPSs) of the plant‐pathogenic bacterium Burkholderia caryophylli, the complete structure of lipid A has been characterized. For the first time, a 4‐amino‐4‐deoxy‐L‐arabinopyranose 1‐phosphate residue was proven to be exclusively linked to the reducing end of lipid A from a wild‐type LPS. The LPSs of B. caryophylli were degraded by mild acetate buffer hydrolysis at pH 4.4. The obtained lipid A was analyzed as such, and also after de‐O‐acylation or dephosphorylation. The structure of lipid A was identified mainly by means of matrix‐assisted laser desorption/ionisation mass spectrometry, and by various 1D and 2D 1H and 13C NMR spectroscopic measurements.

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