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Taxonomic group: bacteria / Proteobacteria (Phylum: Proteobacteria)
Associated disease: infection due to Escherichia coli [ICD11: XN6P4

]

The structure was elucidated in this paper
NCBI PubMed ID: 12819207
Journal NLM ID: 2985121R
Publisher: Baltimore, MD: American Society for Biochemistry and Molecular Biology
Correspondence: sml

fz-borstel.de
Institutions: Borstel Research Center, Center for Medicine and Biosciences, Borstel, Germany

Lipopolysaccharide (LPS) from Escherichia coli K12 W3100 is known to contain several glycoforms, and the basic structure has been investigated previously by methylation analyses (Holst, O. (1999) in Endotoxin in Health and Disease (Brade, H., Opal, S. M., Vogel, S. N., and Morrison, D., eds) pp. 115-154; Marcel Dekker, Inc., New York). In order to reveal dependences of gene activity and LPS structure, we have now determined the composition of de-O-acylated LPS by electrospray ionization-Fourier transform ion cyclotron-mass spectrometry (ESI-FT-MS) and identified 11 different LPS molecules. We have isolated the major glycoforms after de-O- and de-N-acylation and obtained four oligosaccharides that differed in their carbohydrate structure and phosphate substitution. The main oligosaccharide accounted for approximately 70% of the total and had a molecular mass of 2516 Da according to ESI-FT-MS. The dodecasaccharide structure (glycoform I) as determined by NMR was consistent with MS and compositional analysis. One minor oligosaccharide (5%) of the same carbohydrate structure did not contain the 4'-phosphate of the lipid A. Two oligosaccharides contained the same phosphate substitution but differed in their carbohydrate structure, one (5%) which contained an additional β-D-GlcN in 1→7 linkage on a terminal heptose residue (glycoform II) which was N-acetylated in LPS. A minor amount of a molecule lacking the terminal L-α-D-Hep in the outer core but otherwise identical to the major oligosaccharide (glycoform III) could only be identified by ESI-FT-MS of the de-O-acylated LPS. The other oligosaccharide (20%) contained an α-Kdo-(2→4)-[α-L-Rha-(1→5)]-α-Kdo-(2→4)-α-Kdo branched tetrasaccharide connected to the lipid A (glycoform IV). This novel inner core structure was accompanied by a truncation of the outer core in which the terminal disaccharide L-α-D-Hep-(1→6)-α-D-Glc was missing. The latter structure was identified for the first time in LPS and revealed that changes in the inner core structure may be accompanied by structural changes in the outer core.

Lipopolysaccharide, biosynthesis, LPS, oligosaccharide, core, strain, structural, analysis, Escherichia, Escherichia coli, Oligosaccharides, structural analysis

Structure type: oligomer
Location inside paper: p. 34100, glycoform III
Aglycon: O-deacetylated lipid A
Compound class: core oligosaccharide
Contained glycoepitopes: IEDB_130650,IEDB_130659,IEDB_130670,IEDB_133751,IEDB_136906,IEDB_137472,IEDB_140088,IEDB_140529,IEDB_141794,IEDB_142488,IEDB_144998,IEDB_146664,IEDB_151528,IEDB_190606,IEDB_2189047,IEDB_226811,IEDB_232584,IEDB_983931,SB_192,SB_7

Methods: NMR, ESI-MS, IRMPD-MS
Comments, role: O-decetylated lipopolysaccharide

Related record ID(s): 3738, 3847, 3848
NCBI Taxonomy refs (TaxIDs): 316407
Reference(s) to other database(s): GTC:G08449KE
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There are 16 chemically distinct structures. Please, select:

O=C(O)[C@@]1(O[C@@H]2C[C@](O)(C(=O)O)O[C@H]([C@H](O)CO)[C@@H]2O[C@H]2O[C@H]([C@@H](O)CO)[C@@H](OP(=O)(O)O)[C@H](O[C@H]3O[C@H]([C@@H](O)CO[C@H]4O[C@H]([C@@H](O)CO)[C@@H](O)[C@H](O)[C@@H]4O)[C@@H](OP(=O)(O)O)[C@H](O[C@H]4O[C@H](CO[C@H]5O[C@H](CO)[C@H](O)[C@H](O)[C@H]5O)[C@@H](O)[C@H](O[C@H]5O[C@H](CO)[C@@H](O)[C@H](O)[C@H]5O[C@H]5O[C@H](CO)[C@@H](O)[C@H](O)[C@H]5O)[C@H]4O)[C@@H]3O)[C@@H]2O)C[C@@H](O)[C@@H](O)[C@@H]([C@H](O)CO)O1

SVG MW SMILES 3D mol Ionize