Composition of a methylated,acidic polysaccharide associated with coccoliths of Emiliania huxleyi (Lohmann) Kamptner |
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Authors: | Anne Marie J. Fichtinger-Schepman Johannis P. Kamerling Johannes F.G. Vliegenthart Elisabeth W. De Jong Leendert Bosch Peter Westbroek |
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Affiliation: | Laboratory of Organic Chemistry, State University of Utrecht, Utrecht The Netherlands;Department of Biochemistry, State University of Leiden, Leiden The Netherlands |
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Abstract: | The water-soluble, acidic polysaccharide isolated from the coccoliths of the alga Emiliania huxleyi (Lohmann) Kamptner contains residues of the following sugars: l-galactose, d-glucose, d-mannose, l-mannose, l-rhamnose, l-arabinose, d-ribose, d-xylose, 6-O-methyl-d-mannose, 6-O-methyl-l-mannose, 2,3-di-O-methyl-l-rhamnose, 3-O-methyl-d-xylose, and d-galacturonic acid. l-Mannose, 6-O-methyl-d-mannose, 6-O-methyl-l-mannose, and 2,3-di-O-methyl-l-rhamnose are novel constituents of a polysaccharide. In addition, the presence of sulphate groups was found. Galacturonic acid and sulphate in the polysaccharide bind Ca2+ ions apparently in a ratio of one mol of Ca2+ per mol of acidic residue. This feature is relevant for the proposed matrix function of the polysaccharide in the formation of the calcified cell-wall plates (coccoliths) of the alga. |
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