Abstract
The human blood-group determinants H-type 1 (α-l-Fuc-(1 → 2)-β-d-Gal-(1 → 3)β-d-GlcNAc), or type 2 (α-l-Fuc(1 → 2)-β-d-Gal(1 → 4)-β-d-GlcNAc) and their mono- and disaccharidic precursors, have been reported to induce d-glycanase (laminarinase) activity in Rubus cells (Y. Liénart et al. 1990, Plant Science 68, 197–202) and protoplasts (Y. Liénart et al. 1991, Plant Science 77, 41–45). Using immunoadsorbent H-type 1 as a matrix for the affinity purification of membrane proteins, and the H-type 2 trisaccharide neoglycoprotein as ligand in kinetic-dependent enzyme-linked-immunosorbent assay for measuring binding, we were able to show that Rubus microsomes contain high-affinity binding sites for the laminarinase inducers. The N-acetyl glucosamine (GlcNAc) eluate was found to contain a saturable, high affinity binding activity for GlcNAc, compatible with the presence of a single class of binding sites Kd = 2 nM, Bmax = 400 pmol · (mg protein)−1. In contrast, the Scatchard plot of proteins in the lactose eluate was nonlinear. In competition studies, the precursors of H-type 1 (GlcNAc-OCH3, β-d-Gal-(1 → 3)-β-d-GlcNAc-OCH3) or of H-type 2 (GlcNAc, N-acetyl lactosamine) trisaccharides inhibited the binding of the proteins in the GlcNAc eluate by H-type 2 neoglycoprotein with respective IC50 values of 0.6, 0.6 or 2, 0.4 nM. These data, and the binding of the H-type 2 trisaccharide by a protein of Mr 260 kDa in a ligand-blot process, are indicative of the general properties exhibited by receptors.
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Abbreviations
- Fuc:
-
fucose
- Gal:
-
galactose
- Glc:
-
glucose
- GlcNAc:
-
N-acetyl glucosamine
- LacNAc:
-
N-acetyl lactosamine
- k-ELISA:
-
kinetic-dependent enzyme-linked immunosorbent assay
- SDS-PAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
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We greatly thank Dr. P. Ridley-Smith (University of Sussex, UK) for correcting the English manuscript.
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Liénart, Y., Dubois-Dauphin, R., Gautier, C. et al. Membrane binding sites for the human blood group H-type 2 determinant, an inducer of laminarinase activity in protoplasts of Rubus fruticosus L.. Planta 188, 506–512 (1992). https://doi.org/10.1007/BF00197042
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DOI: https://doi.org/10.1007/BF00197042