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. 1980 Apr 1;187(1):53–63. doi: 10.1042/bj1870053

Glycoproteins from the cell wall of Phaseolus coccineus.

M A O'Neill, R R Selvendran
PMCID: PMC1162493  PMID: 7406871

Abstract

1. The use of a modified sodium chlorite/acetic acid delignification procedure for the solubilization of a hydroxyproline-rich glycoprotein fraction from the depectinated cell walls of Phaseolus coccineus is described. 2. The crude glycoprotein was associated with some pectic material; hydroxyproline and serine were the most abundant amino acids, and arabinose, galactose and galacturonic acid the predominant monosaccharides. 3. The bulk of the hydroxyproline is O-glycosidically substituted with tetra- and tri-arabinofuranosides. From methylation analysis the linkages in these arabinosides could be inferred. 4. Ion-exchange chromatography of the crude glycoprotein gave one major and two minor hydroxyproline-rich fractions, with similar amino acid but different monosaccharide composition. 5. In the major fraction, serine appears to be O-glycosidically substituted with a single galactopyranoside residue that can be removed by the action of alpha-galactosidase but not beta-galactosidase. Removal of arabinofuranoside residues by partial acid hydrolysis greatly enhanced the action of alpha-galactosidase. 6. Methylation followed by carboxy reduction with LiAl2H4 has shown the presence of (1 leads to 4)-linked galacturonic acid in the crude glycoprotein fraction but not in the major fraction from the ion-exchange column. Hence the bulk of the pectic material is not associated with the major glycoprotein component. It is suggested that the glycoprotein is held in the wall by phenolic cross-links. 7. Similarities with the glycopeptide moiety of potato lectin provides further evidence for a class of hydroxyproline-rich glycoproteins with common features.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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