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American Zoologist 1979 19(3):809-820; doi:10.1093/icb/19.3.809
© 1979 by The Society for Integrative and Comparative Biology
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Intercellular Adhesion in the Cellular Slime Mold Polysphondylium pallidum

STEVEN D. ROSEN and JASMINDER KAUR
Department of Anatomy, University of California San Francisco, California 94143

Evidence is reviewed implicating a cell surface carbohydrate-binding protein (lectin) named pallidin as the mediator of intercellular adhesion in the cellular slime mold Polysphondylium pallidum. Three isolectin forms of pallidin have now been purified and characterized. Both lectin and receptor to which lectin can bind are present on the cell surface of adhesive amoebae. Since pallidin antagonists such as specific sugars, asialofetuin, or specific univalent antibody interfere with intercellular adhesion, cell-cell binding may be based on complementary interactions between pallidin and specific receptors on adjoining cells.


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