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Characterization of a Novel Sulfated Carbohydrate Unit Implicated in the Carbohydrate­Carbohydrate-mediated Cell Aggregation of the Marine Sponge Microciona prolifera
University of Turku.
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1995 (English)In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 270, 5089-5097 p.Article in journal (Refereed) Published
Abstract [en]

Species-specific cell reaggregation in the marine sponge Microciona prolifera is mediated by an adhesion proteoglycan. Two interactions are involved in the process: a Ca(2+)-dependent homophilic binding between proteoglycan molecules and a Ca(2+)-independent binding between the molecule and cells. Both interactions are mediated by the glycan moieties of the proteoglycan. The interaction of the proteoglycan with itself has been characterized as a carbohydrate-carbohydrate interaction of multiple low affinity sites. The monoclonal antibodies Block 1 and Block 2 raised against the purified aggregation proteoglycan and selected for inhibition of aggregation bind to these glycans. In a previous report the structure, [formula: see text] was assigned to the oligosaccharide reacting with Block 1 antibody (Spillmann, D., Hård, K., Thomas-Oates, J., Vliegenthart, J. F. G., Misevic, G., Burger, M. M., and Finne, J. (1993) J. Biol. Chem. 268, 13378-13387). By the technique of attaching the water-soluble acid-degraded fragments to a lipid carrier for immunochemical detection and by chemical, enzymatic and spectroscopic methods the structure, [formula: see text] was assigned to the oligosaccharide reacting with the aggregation-blocking monoclonal antibody Block 2. The structure, [formula: see text] was assigned to a major nonreactive oligosaccharide, which outlined the molecular requirements of antibody binding of the two aggregation-associated epitopes. These data demonstrate that two different functional sites with distinct structural characteristics and antibody reactivities are involved in the reaggregation of sponge cells, a model of carbohydrate-carbohydrate-mediated cell interactions.

Place, publisher, year, edition, pages
1995. Vol. 270, 5089-5097 p.
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Medical and Health Sciences
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URN: urn:nbn:se:uu:diva-52622PubMedID: 7890617OAI: oai:DiVA.org:uu-52622DiVA: diva2:80532
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2017-12-04Bibliographically approved

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