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Journal of Cell Science, Vol 99, 485-495, Copyright © 1975 by Company of Biologists

Cell surface oligosaccharides on Dictyostelium during development

SUPAVADEE AMATAYAKUL-CHANTLER 1, MICHAEL A. J. FERGUSON 2, RAYMOND A. DWEK 1, THOMAS W. RADEMACHER 1, RAJ B. PAREKH 3, IAN E. CRANDALL 4, and PETER C. NEWELL 4

1 Oxford Glycobiology Unit, Department of Biochemistry, University of Oxford, South Parks Road, Oxford 0X1 3QU, UK
2 Oxford Glycobiology Unit, Department of Biochemistry, University of Oxford, South Parks Road, Oxford 0X1 3QU, UK; Present address: Department of Biochemistry, University of Dundee, Dundee DD1 4HN, UK
3 Oxford GlycoSystems, Unit 4 Hitching Court, Blacklands Way, Abingdon, Oxon 0X14 1RG, UK
4 Department of Biochemistry, University of Oxford, South Parks Road, Oxford 0X1 3QU, UK

Author for correspondence

Developmental studies of the changes in protein glycosylation are useful in elucidating the role of oligosaccharides in biological events. We have used the chemical technique, hydrazinolysis, to release oligosaccharides from cell surface glycoproteins of Dictyostelium discoideum. Oligomannose type, xylose- and fucose-containing oligosaccharides were found to be present. The charged oligosaccharides contained sulphate and mannose 6-phosphate residues; no sialic acid was detected. The charged oligosaccharides also contained significant amounts of xylose, arabinose, fucose and galactose, as well as mannose and N-acetylglucosamine, which were the main constituents of the neutral glycans.

By monitoring the chemical characteristics of the liberated oligosaccharides, dramatic changes in both the charge and size distribution of cell surface oligosaccharides were observed throughout the 24 h period of cell development. A comparison, however, between the neutral glycan structures of prestalk and prespore cells, over the same time frame showed no dramatic differences

Discoidin, a lectin present on the cell surface of 8 h cells, was found not to be glycosylated. Affinity chromatography using immobilised discoidin was used to probe a sugar library made from the cell surface glycoproteins of 8h cells. Discoidin was found to bind selectively an oligosaccharide with the structure Man{alpha}3(Man{alpha}6)(Xyl{beta}2)Man{beta}4GlcNAc. This oligosaccharide lacks a conventional N,N'-diacetylchitobiose core and has only been previously observed in plant glycoproteins. Peptide-N-glycosidase F treatment of horseradish peroxidase released an identical structure, confirming that the oligosaccharide was not a degradation fragment of the hydrazine. The oligosaccharide was found to inhibit discoidinmediated haemagglutination with a Kt of 0.75 mM, a concentration approximately 100 times lower than that for galactose

The correlation between changes in the amoebal plasma membrane oligosaccharide structures and the biological events occurring at different stages of development such as cell-cell adhesion and cellsubstratum attachment suggest an important role for sugars in these processes

Key words: oligosaccharides, cell surface, plasma membrane, development, hydrazinolysis, discoidin, N-glycosylation, Dictyostelium






© The Company of Biologists Ltd 1975