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ec 2.7.7
organophosphates
contributors: 6
views: 327
The O-specific polysaccharide of the lipopolysaccharide of Proteus penneri strain 103 was studied using 1 H and 1 3 C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, H-detected 1 H, 1 3 C HMQC, 1 H, 3 1 P HMQC, and HMBC experiments. It was found that the polysaccharide is built up of oligosaccharide-ribitol phosphate repeating units and thus resembles ribitol teichoic acids of Gram-positive bacteria. The following structure of the polysaccharide was established:where Et...
polisacharydy
bacteriology
protein families
polysaccharides
contributors: 5
views: 457
A glycerol teichoic acid-like O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O8 and studied by chemical methods and NMR spectroscopy, including 2D ROESY, { 1 H, 13 C} HSQC, and HMQC-TOCSY experiments. It was found that the compound contains a new component of bacterial lipopolysaccharides: ether-linked (2S,4R)-2,4-dihydroxypentanoic acid (Dhpa), which was identified by NMR spectroscopy. The following structure ...
phosphates
fosforany
contributors: 5
views: 366
The O-specific polysaccharide of Proteus mirabilis O16 was studied by 1 H and 13 C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, H-detected 1 H, 13 C HMQC, HMQC-TOCSY, and 1 H, 31 P HMQC experiments, along with chemical methods. The polysaccharide was found to be a ribitol teichoic acid-like polymer having the following structure
polisacharydy
kwasy cukrowe
benzoic acids
polysaccharides
contributors: 5
views: 422
The O-polysaccharide chain of the lipopolysaccharide (LPS) of Providencia stuartii O20 was found to contain d-glucuronic acid, N-acetyl-d-glucosamine, and a rarely occurring higher sugar 5,7-diacetamido-3,5,7,9-tetradeoxy-l-glycero-d-galacto-non-2-ulosonic acid (di-N-acetyl-8-epilegionaminic acid, 8eLeg5Ac7Ac). Degradation of the LPS with dilute acetic acid caused depolymerization of the polysaccharide chain by the ketosidic linkage to give a tetrasaccharide corresponding ...
protein families
polish resistance during world war ii
choroby bakteryjne
bacterial diseases
contributors: 6
views: 397
O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide (LPS) of Proteus penneri strain 31. Sugar and methylation analyses along with NMR spectroscopic studies, including 2D 1 H, 1 H COSY, TOCSY, ROESY, 1 H, 1 3 C and 1 H, 3 1 P HMQC experiments, demonstrated the following structure of the polysaccharide: where FucNAc is 2-acetamido-2,6-dideoxygalactose and EtnP is 2-aminoethyl phosphate. The polysaccharide studied has the same carbohydrate backbon...
protein families
reakcje chemiczne
układ immunologiczny
polisacharydy
contributors: 6
views: 431
A high-molecular-mass O-specific polysaccharide was obtained by mild acid degradation of Proteus vulgaris O8 lipopolysaccharide followed by gel permeation chromatography. Studies of the polysaccharide by sugar and methylation analyses and 1 H and 1 3 C NMR spectroscopy, including 2D COSY, TOCSY, NOESY, and H-detected 1 H, 1 3 C heteronuclear multiple-quantum coherence (HMQC) experiments, demonstrated the presence of a tetrasaccharide repeating unit having the following str...
spectroscopy
nuclear magnetic resonance
spektroskopia
contributors: 7
views: 358
An unusual ribitol teichoic acid-like O-polysaccharide was isolated by mild acid degradation of the lipopolysaccharide from a previously non-classified Proteus vulgaris strain TG 276-1. Structural studies using chemical analyses and 2D 1 H and 13 C NMR spectroscopy showed that the polysaccharide is a zwitterionic polymer with a repeating unit containing 2-acetamido-4-amino-2,4,6-trideoxy-d-galactose (d-FucNAc4N) and two d-ribitol phosphate (d-Rib-ol-5-P) residues and havin...
fosforany
phosphates
contributors: 8
views: 358
A highly phosphorylated O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Proteus mirabilis O41 followed by GPC. The initial and dephosphorylated polysaccharides and phosphorylated products from two sequential Smith degradations were studied by 1 H, 1 3 C and 3 1 P NMR spectroscopy and ESI-MS. The O-polysaccharide was found to have a tetrasaccharide repeating unit containing one ribitol phosphate (presumably d-Rib-ol-5-P) and two ethanolam...
układ immunologiczny
polisacharydy
vaccines
szczepionki
contributors: 6
views: 402
The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O12. Its structure was studied by sugar analysis using GLC of the alditol acetates and (S)-2-octyl glycosides, methylation analysis, Smith degradation, and 1 H and 13 C NMR spectroscopy, including 2D 1 H– 1 H COSY, TOCSY, ROESY, 1 H– 13 C HSQC, and HMBC experiments. It was found that the polymer is a neutral heteropolysaccharide and has a branched heptasacchari...
nuclear magnetic resonance
contributors: 5
views: 379
Recently, ether-linked diastereomeric 2,4-dihydroxypentanoic acids have been reported as new components of bacterial glycans [Shashkov, A. S. et al. Nat. Prod. Commun. 2008, 3, 1625–1630]. In this work, an ether of (2R,4R)-2,4-dihydroxypentanoic acid (Dhpa) with d-mannose was identified in the O-polysaccharide of Providencia alcalifaciens O31, and the polysaccharide structure was elucidated. Studies by NMR spectroscopy confirmed the ether linkage between O-2 of Dhpa and O-...
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