Elucidation of Structure of Lipid A from the Marine Gram-Negative Bacterium Pseudoalteromonas haloplanktis ATCC 14393T

The chemical structure of lipid A, from the marine γ-proteobacterium Pseudoalteromonashaloplanktis АТСС 14393Т, a main product of lipopolysaccharide hydrolysis (1% AcOH), was determined using chemical methods and NMR spectroscopy. The lipid A was shown to be β-1,6-glucosaminobiose 1,4′-diphosphate acylated with two (R)-3-hydroxyalkanoic acid residues at C3 and C3′ and amidated with one (R)-3-hydroxydodecanoyl and one (R)-3-dodecanoyloxydodecanoyl residue at N2 and N2′, respectively.