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    Change in state of nerve growth factor receptor. Modulation of receptor affinity by wheat germ agglutinin

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    Authors
    Buxser, Stephen E.
    Kelleher, Daniel J.
    Watson, Leslie
    Puma, Patricia
    Johnson, Gary L.
    UMass Chan Affiliations
    Biochemistry and Molecular Pharmacology
    Neurobiology
    Document Type
    Journal Article
    Publication Date
    1983-03-25
    Keywords
    Cell Line
    Cell Membrane
    Humans
    Kinetics
    Lectins
    Liposomes
    Melanoma
    Nerve Growth Factors
    Receptors, Cell Surface
    Receptors, Nerve Growth Factor
    Trypsin
    Wheat Germ Agglutinins
    Biochemistry
    Biochemistry, Biophysics, and Structural Biology
    Molecular Biology
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    Link to Full Text
    http://www.jbc.org/content/258/6/3741.long
    Abstract
    The binding of 125I-labeled nerve growth factor (NGF) to human melanoma cell (A875) membranes, detergent-soluble membrane extracts, and membrane extracts reconstituted into phospholipid vesicles was significantly increased when binding was carried out in the presence of wheat germ agglutinin (WGA). In the absence of WGA, all 125I-NGF binding was rapidly eliminated by trypsin treatment or rapidly dissociated in the presence of a high concentration of unlabeled NGF. However, in the presence of WGA, up to 75% of 125I-NGF bound was resistant to trypsin digestion and was only slowly dissociated by a high concentration of unlabeled NGF. The effects of WGA can be blocked or reversed by N-acetylglucosamine. Both WGA and NGF rapidly associate with soluble extracts and reconstituted vesicles and, at the concentrations used here, reach binding equilibrium within 2 min. The conversion to slowly dissociating, trypsin-resistant binding, however, was not complete for at least 10 min. Both WGA and NGF are required for maximum accumulation of trypsin-resistant, slowly dissociating binding. The order of addition of NGF and WGA has no effect on the rate of conversion of NGF-receptor, and the conversion occurs after both NGF and WGA are present. The amount of conversion is dependent on the incubation temperature, and significantly greater conversion occurs at 37 than at 0 degrees C. The generation of the trypsin-resistant, slowly dissociating state of NGF-receptor is consistent with a time- and temperature-dependent conformational change in NGF-receptor which occurs after interaction of both NGF and WGA with the receptor or closely associated structures.
    Source
    J Biol Chem. 1983 Mar 25;258(6):3741-9.
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/26057
    PubMed ID
    6300053
    Related Resources
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    UMass Chan Faculty and Researcher Publications
    Neurobiology Faculty Publications

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