Abstract
A novel integrated optical technique is used to monitor the kinetics of incorporation of glycophorin A (GPA) from solution into a planar dimyristoylphosphatidylcholine-cholesterol bilayer membrane, and the subsequent binding of wheat germ agglutinin (WGA) to the membrane-incorporated GPA. The technique significantly improves the attainable accuracy of kinetic measurements. The number of bound molecules can be determined to a precision of ca ± 80 mol µm−2. Our results show that GPA incorporates spontaneously into the bilayer. Binding of WGA to GPA is optimal in the presence of human serum albumin, and can be reversed byN-acetyl-d-glucosamine. The kinetics of the binding are consistent with the presence of two classes of kinetically distinguishable binding sites with association rates of 2.0×104 and 9.6×102 M−1 s−1, and dissociation rates of 2.7×10−3 s−1 and <10−5 s−1, respectively. A stoichiometry of 4 WGA monomers per GPA monomer was determined as characteristic of the overall binding interaction.
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Abbreviations
- DMPC:
-
dimyristoylphosphatidylcholine
- GlcNAc:
-
N-acetyl-d-glucosamine
- GPA:
-
glycophorin A
- HSA:
-
human serum albumin
- NeuNAc:
-
N-acetyl-d-neuraminic acid
- TE:
-
transverse electric
- TM:
-
transverse magnetic
- WGA:
-
wheat germ agglutinin
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Ramsden, J.J., Wright, C.S. The interaction between wheat germ agglutinin and membrane incorporated glycophorin A. An optical binding study. Glycoconjugate J 12, 113–121 (1995). https://doi.org/10.1007/BF00731354
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DOI: https://doi.org/10.1007/BF00731354