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1. (Article ID: 10855)
 
York WS, Darvill AG, McNeil M, Albersheim P
Structure of plant cell walls. Part XVI. 3-Deoxy-D-manno-2-octulosonic acid (Kdo) is a component of rhamnogalacturonan II, a pectic polysaccharide in the primary cell walls of plants
Carbohydrate Research 138 (1985) 109-126
 

3-Deoxy-d-manno-2-octulosonic acid (KDO), a sugar previously presumed to occur only as a glycosyl residue in polysaccharides produced by Gram-negative bacteria, was found to be a component of the cell walls of higher plants. In the form of the disaccharide α-l-Rhap-(1→5)-d-KDO, KDO was released by mild hydrolysis with acid from the purified cell wall polysaccharide rhamnogalacturonan II. KDO was shown to be present in purified cell walls of several plants, including dicots, a monocot, and a gymnosperm. Improved methods for detecting and quantitating KDO residues in polysaccharides were developed during this investigation.

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2. (Article ID: 10863)
 
Melton LD, McNeil M, Darvill AG, Albersheim P, Dell A
Structure of plant cell-walls. XVII. Structural characterization of oligosaccharides isolated from the pectic polysaccharide rhamnogalacturonan II
Carbohydrate Research 146 (1986) 279-305
 

Rhamnogalacturonan II (RG-II) is a structurally complex pectic (d-galactosyl-uronic acid-rich) polysaccharide that is present in the primary (growing) cell-walls of higher plants. RG-II is composed of ∼60 glycosyl residues. The isolation and structural characterization of 23 oligosaccharide fragments of the residue of RG-II that remained after removal of hepta- and di-saccharides by partial hydrolysis with acid are reported. In order to obtain the oligosaccharide fragments characterized herein, the carboxyl groups of RG-II were dideuterio-reduced, and the carboxyl-reduced polysaccharide was per-O-methylated. The per-O-methylated polysaccharide was fragmented by partial hydrolysis with acid, producing partially O-methylated oligosaccharides. These derivatized oligosaccharides were reduced, to afford a mixture of partially O-methylated oligoglycosyl-alditols, which was then per-O-methylated. The structures of the resulting per-O-methylated oligoglycosylalditols were determined by chemical-ionization mass spectrometry, electron-impact mass spectrometry, fast-atom-bombardment mass spectrometry, 1H-n.m.r. spectroscopy, and analysis of corresponding, partially O-acetylated, partially O-methylated alditols. Seventeen of the oligosaccharides isolated from RG-II were parts of a single heptasaccharide, namely.

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