title: Binding and precipitating activities of Lotus tetragonolobus isolectins with L-fucosyl oligosaccharides. Formation of unique homogeneous cross-linked lattices observed by electron microscopy.
abstract: We have recently observed that certain asparagine-linked oligosaccharides are multivalent and capable of binding and precipitating with the D-mannose-specific lectin concanavalin A [cf. Bhattacharyya, L., & Brewer, C. F. (1989) Eur. J. Biochem. 178, 721-726] and with a variety of D-galactose-specific lectins [Bhattacharyya, L., Haraldsson, M., & Brewer, C. F. (1988) Biochemistry 27, 1034-1041]. In the present study, we have examined the binding and precipitating activities of a variety of mono- and biantennary L-fucosyl oligosaccharides with three L-fucose-specific isolectins from Lotus tetragonolobus, LTL-A, LTL-B, and LTL-C. The results show that certain difucosyl biantennary oligosaccharides are capable of cross-linking and precipitating with tetrameric isolectins, LTL-A and LTL-C, but not with dimeric isolectin, LTL-B. Quantitative precipitation analyses show that biantennary oligosaccharides containing the Lewis(x) antigen (or type 2 chain of Lewis(a)), Gal beta (1-4)[Fuc alpha (1-3)]GlcNAc, at the nonreducing terminus of each arm are bivalent ligands. However, a biantennary oligosaccharide containing a Lewis(x) determinant on one arm and a type 2 chain of blood group H(O) determinant, Fuc alpha (1-2)Gal beta (1-4)GlcNAc, on the other arm and a monoantennary oligosaccharide containing two fucose residues (analogue of the Lewis(y) antigen) bind but do not precipitate with the isolectins, indicating that the positions and linkage of fucose residues are critical for cross-linking.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461.
authors.forename: L
authors.initials: L
authors.lastname: Bhattacharyya
authors.forename: J
authors.initials: J
authors.lastname: Fant
authors.forename: H
authors.initials: H
authors.lastname: Lonn
authors.forename: C F
authors.initials: CF
authors.lastname: Brewer
mesh_terms: D001667:Binding, Competitive; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D011232:Chemical Precipitation; D003432:Cross-Linking Reagents; D005643:Fucose / Q000378:metabolism*; D007700:Kinetics; D037102:Lectins / Q000378:metabolism*; D008969:Molecular Sequence Data; D037121:Plant Lectins; D010944:Plants / Q000032:analysis; D012639:Seeds / Q000032:analysis; D013329:Structure-Activity Relationship; D013379:Substrate Specificity; D013816:Thermodynamics
chemical_list: D003432:Cross-Linking Reagents; D037102:Lectins; D037121:Plant Lectins; C027112:fucose-binding lectin; D005643:Fucose