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  • 1
    Electronic Resource
    Electronic Resource
    Chemical composition of the lipopolysaccharides of Ectothiorhodospira shaposhnikovii, Ectothiorhodospira mobilis, and Ectothiorhodospira halophila (1992)
    Springer
    Archives of microbiology 157 (1992), S. 499-504 
    Details
    ISSN: 1432-072X
    Keywords: Cell wall ; Ecothiorhodospira shaposhnikovii ; Ectothiorhodospira mobilis ; Ectothiorhodospira halophila ; Halophilic bacteria ; Lipopolysaccharide ; Lipid A ; Lipid ADAG ; “Mixed” lipid A ; Phototrophic bacteria ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides were isolated from the moderate halophilic Ectothiorhodospira shaposhnikovii slight to and Ectothiorhodospira mobilis and from the extremely halophilic Ectothiorhodospira halophila by the hot phenol-water and purified by the phenol-chloroform-petroleum ether methods. The isolated lipopolysaccharides of all three species contained 3-deoxy-d-manno-octulosonic acid and d-glycero-d-mannoheptose indicating the existence of a core. They contained additionally glucose and uronic acids (E. shaposhnikovii and E. mobilis) or glucose, uronic acids and threonine (E. halophila). Sodium deoxycholate gel-electrophoresis of the three lipopolysaccharides, each showing only one major band, indicated R-type character of the lipopolysaccharides of the three Ectothiorhodospira species. The lipid A fractions of the lipopolysaccharides from E. shaposhnikovii and E. mobilis represented phosphorylated “mixed” lipid A types with both 2,3-diamino-2,3-dideoxy-d-glucose and d-glucosamine. The lipid A from E. halophila contained also phosphate and 2,3-diamino-2,3-dideoxy-d-glucose but only traces of d-glucosamine, which would indicated lipid ADAG. The fatty acid spectra were characterized by amide-bound 3-OH-10:0 and 3-OH-12:0 (E. shaposhnikovii), 3-OH-10:0 (E. mobilis), or 3-OH-10:0,3-OH-14:0, and 3-oxo-14-0 (E. halophila). The predominant ester-bound fatty acids were 14:0 and 16:0 (E. shaposhnikovii and E. mobilis), or 12:0 and 14:1 (E. halophila).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276769
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  • 2
    Electronic Resource
    Electronic Resource
    Lipopolysaccharide of Rhodospirillum salinarum 40: structural studies on the core and lipid A region (1995)
    Springer
    Archives of microbiology 164 (1995), S. 280-289 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsRhodospirillum salinarum ; Lipopolysaccharide ; Mixed lipid A ; 2 ; 3-Diamino-2 ; 3-dideoxy-d-glucose ; 4-O-Methyl- ; galacturonic acid ; Halophilic bacteria ; Lethal toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The structural elucidation of lipid A of the cell wall lipopolysaccharide (LPS) of Rhodospirillum salinarum 40 by chemical methods and laser desorption mass spectrometry revealed the presence of a mixed lipid A composed of three different 1,4′bisphosphorylated β(1→6)-linked backbone hexosaminyl-hexosamine disaccharides, i.e. those composed of GlcN→GlcN, 2,3-diamino-2,3-dideoxy-d-Glc-(DAG)→DAG, and DAG→GlcN. Lipid A of R. salinarum contained preferentially 3-OH-18 : 0 and 3-OH-14 : 0 as amide-linked and cisΔ11–18 : 1 and c19 : 0 as ester-linked fatty acids. The mass spectra of the liberated acyl-oxyacyl residues proved the concomitant presence of 3-O-(cisΔ11–18 : 1)–18 : 0 and 3-O-(c19 : 0)-14 : 0 as the predominating diesters in this mixed lipid A. The glycosidically linked and the ester-linked phosphate groups of the backbone disaccharide were neither substituted by ethanolamine, phosphorylethanolamine, nor by 4-amino-4-deoxy-l-arabinose, in contrast to most of the enterobacterial lipid As. In the core oligosaccharide fraction, a HexA (1→4)HexA(1→5)Kdo-trisaccharide was identified by methylation analysis. The terminal HexA (hexuronic acid) is possibly 4-OMe-GalA, a component described here as an LPS constituent for the first time. LPS of R. salinarum showed a lethality in C57BL/10 ScSN (LPS-responder)-mice) of an order of 10–1–10–2 of that reported for Salmonella abortus equi LPS, and it was also capable of inducing TNFα and IL6 in macrophages of C57BL/10ScSN mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050265
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical composition of the lipopolysaccharides of Rhodobacter sulfidophilus, Rhodopseudomonas acidophila, and Rhodopseudomonas blastica (1985)
    Springer
    Archives of microbiology 143 (1985), S. 32-36 
    Details
    ISSN: 1432-072X
    Keywords: Lipopolysaccharide ; Lipid A ; Rhodobacter sulfidophilus ; Rhodopseudomonas acidophila ; Rhodopseudomonas blastica ; Phototrophic bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lipopolysaccharides of Rhodobacter sulfidophilus and the two budding species Rhodopseudomonas acidophila and Rhodopseudomonas blastica were isolated and chemically analyzed. The all have a lipid A backbone structure with glucosamine as the only amino sugar. The lipid A's of Rb. sulfidophilus and Rps. blastica contain phosphate, their fatty acids are characterized by ester-linked, unsubstituted 3-OH-10:0 and amide-linked 3-OH-14:0 (Rb. sulfidophilus) or 3-oxo-14:0 (Rps. blastica). Lipid A of Rps. acidophila is free of phosphate and contains the rare 3-OH-16:0 fatty acid in amide linkage. The lipopolysaccharides of all three species contain 2-keto-3-deoxy-octonate (KDO) but are devoid of heptoses. Neutral sugars with the exception of glucose are lacking in the lipopolysaccharide of Rb. sulfidophilus. This shows a high galacturonic acid content. The lipopolysaccharides of Rps. acidophila and Rps. blastica have neutral sugar spectra indicative for typical O-chains (rhamnose, mannose, galactose, glucose in both species, and in Rps. blastica additionally 2-O-methyl-6-deoxy-hexose). The taxonomic value of the data is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414764
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical characterization of two lipopolysaccharide species isolated from Rhizobium loti NZP2213 (1995)
    Springer
    Archives of microbiology 163 (1995), S. 345-351 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsRhizobium loti ; Rhizobium huakuii ; Lipopolysaccharide ; 4-Oxo-20:0 ; 6-Deoxy-l-talose ; 2 ; 3-Diamino-2 ; 3-dideoxy-d-glucose ; Lipid ADAG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phenol-water extraction of Rhizobium loti NZP2213 cells allowed a simultaneous isolation of two structurally different lipopolysaccharides from the aqueous (LPS-W) and phenol (LPS-P) phase that differed in their sodium deoxycholate-PAGE pattern and composition. LPS-W showed a profile indicating an R-type LPS; LPS-P had a cluster of poorly resolved bands in the high-molecular-weight region. LPS-P contained large amounts of 6-deoxy-l-talose (6dTal), and a small amount of 2-O-methyl-6-deoxy-talose (molar ratio ∼30:1), both of which were completely absent in LPS-W. Methylation analysis gave only one major product, 2,4-di-O-methyl-6dTal, indicating that the O-chain is composed of a homopolymer of 1,3-linked 6dTal, having the methylated 6dTal (2-O-Me-6dTal) probably localized at the non-reducing end of the O-chain. This homopolymeric O-chain was additionally O-acetylated, as evidenced by GC-MS and by 13C NMR analysis. The lipid A moieties of both LPS-W and LPS-P showed almost identical composition, with six different 3-OH fatty acids and with two, so far not described, long-chain 4-oxo-fatty acids, all being amide-linked, and with 27-OH-28:0 as the main ester-linked fatty acid. Lipid A was of the lipid ADAG-type, i.e., having a (phosphorylated) 2,3-diamino-2,3-dideoxy-d-glucose-containing lipid A backbone. Lipid ADAG is widespread among species of the α-2 group of Proteobacteria, but has so far not been encountered in any other rhizobial or agrobacterial species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404207
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    Paper (German National Licenses)
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