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• W2013669772 abstract "The orientation of synthetic 13C-labeled glycolipid receptors and their interaction with the plant lectin wheat germ agglutinin have been studied in an oriented membrane system using NMR spectroscopy. A series of 2-[1,2-13C2]acetamido-2-deoxy-beta-D-glucopyranosides were synthesized with between zero and four hydrophilic ethoxy units between the headgroup and an alkyl chain which anchors the receptors in the bilayers. The chemical shift anisotropy of the 13C carbonyl and a 13C-13C dipolar coupling between the labeled carbons provide information about the orientation and dynamics of the receptor headgroup in oriented membrane systems. It was found that the headgroups of the receptors with two, three, or four ethoxy units appeared isotropic when incorporated in the oriented bilayers, but those of the receptors with zero or one ethoxy units were significantly ordered by the bilayers. The average orientations consistent with measured spectral parameters were determined for the receptors with zero and one ethoxy units and were found to coincide with low-energy conformations from molecular modeling. When the plant lectin wheat germ agglutinin was added to the sample, only the receptors with two, three, or four ethoxy units separating the headgroup from the alkyl chain showed evidence of binding by the lectin. Although the 13C-labeled resonances broadened when the protein bound, no changes in dipolar couplings or chemical shift anisotropies could be detected, suggesting that the motion of the headgroup was slowed by protein binding, but average orientation and overall order changed little. Competition studies demonstrated that none of the lectin/receptor complexes are more stable than the complex of the lectin and N-acetylglucosamine in solution. These results suggest that the membrane does not stabilize the interactions of wheat germ agglutinin with these cell-surface receptors. Furthermore, molecular modeling demonstrates that the zero- and one-spacer receptors may not bind wheat germ agglutinin because the orientations of the N-acetyl groups in these receptors would result in significant steric contacts between the lectin/receptor complex and the membrane." @default.
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• W2013669772 date "1994-08-01" @default.
• W2013669772 modified "2023-09-27" @default.
• W2013669772 title "13C NMR Studies of Wheat Germ Agglutinin Interactions with N-Acetylglucosamine at a Magnetically Oriented Bilayer Surface" @default.
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• W2013669772 doi "https://doi.org/10.1021/bi00199a042" @default.
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