Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
Associated disease: infection due to Escherichia coli [ICD11:
XN6P4 
]
NCBI PubMed ID: 8223620Journal NLM ID: 0107600Publisher: Oxford, UK: Blackwell Science Ltd. on behalf of the Federation of European Biochemical Societies
Institutions: Institut für Kristallographie, Freien Universität Berlin, Germany
X-ray powder-diffraction experiments have been performed on dry samples of lipid A and various rough-mutant lipopolysaccharides (LPS) of Salmonella minnesota, Salmonella typhimurium and Escherichia coli. The diffraction patterns obtained indicated exclusively lamellar, bilayered arrangements in all samples. The periodicities were found to be in the range 4.5 nm for lipid A to 8.8 nm for Ra-LPS. Upon treatment with water-saturated air, swelling of the lamellar structures was achieved, as indicated by shifts of reflections. The increase in bilayer dimensions normally was about 0.3 nm. X-ray intensities were used for the determination of the inner bilayer structure, i.e. for calculation of the one-dimensional electron-density distribution across the bilayer. For lipid A and several Re-LPS, Rd2-LPS, Rd1-LPS and Rc-LPS samples, a striking coincidence of the electron-density distributions in the lipid-A domain was found, suggesting that in all these structures the lipid-A portion is similarly arranged. For Rb1 and Ra-LPS the lipid-A domain could not be resolved due to the limited number of observed reflections. For other Re-mutant lipopolysaccharide samples, quite different X-ray patterns were obtained. Some samples yielded diffraction patterns indicating a very high state of order in the lipid-A domain, whereas, in others, a significantly reduced order in the lipid-A domain was inferred. Comparison of the X-ray data with features of a calculated three-dimensional molecular model of lipopolysaccharide revealed reasonable agreement in molecular dimensions and bilayer structure.
Structure type: oligomer
Location inside paper: Ra
Aglycon: lipid A
Compound class: LPS
Contained glycoepitopes: IEDB_130650,IEDB_130656,IEDB_130657,IEDB_130658,IEDB_130659,IEDB_130670,IEDB_130693,IEDB_135813,IEDB_136906,IEDB_137340,IEDB_137472,IEDB_140088,IEDB_140529,IEDB_141794,IEDB_141807,IEDB_142488,IEDB_144998,IEDB_146664,IEDB_150901,IEDB_151528,IEDB_151531,IEDB_190606,IEDB_2189047,IEDB_226811,IEDB_983931,SB_192,SB_7
Methods: X-ray
Comments, role: Parent molecule: Lipid A
Related record ID(s): 124341
NCBI Taxonomy refs (TaxIDs): 562,
70803,
90371Reference(s) to other database(s): GTC:G20837XG, GlycomeDB:
28493
Show glycosyltransferases
There are too many chemically distinct structures (~2400), so only one is shown:
Ac(1-2)?DGlcpN(1-2)?DGlcp(1-2)aDGalp(1-3)[aDGalp(1-6)]aDGlcp(1-3)[aXLDmanHepp(1-7)]aXLDmanHepp(1-3)aXLDmanHepp(1-1)[aXKdop(2-1)aXKdop(2-2)]aXKdop
Found 
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