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- W1520385835 abstract "The synaptic basal membrane protein agrin initiates the aggregation of acetylcholine receptors at the postsynaptic membrane of the developing neuromuscular junction. Recently, α-dystroglycan was found to be a major agrin-binding protein on the muscle cell surface and was therefore considered a candidate agrin receptor. Employing different truncation fragments of agrin, we determined regions of the protein involved in binding to α-dystroglycan and to heparin, an inhibitor of α-dystroglycan binding. Deletion of a 15-kDa fragment from the C terminus of agrin had no effect on its binding to α-dystroglycan from rabbit muscle membranes, even though this deletion completely abolishes its acetylcholine receptor aggregating activity. Conversely, deletion of a central region does not affect agrin's clustering activity, but reduced its affinity for α-dystroglycan. Combination of these two deletions resulted in a fragment of ~35 kDa that weakly bound to α-dystroglycan, but displayed no clustering activity. All of these fragments bound to heparin with high affinity. Thus, α-dystroglycan does not show the binding specificity expected for an agrin receptor. Our data suggest the existence of an additional component on the muscle cell surface that generates the observed ligand specificity. The synaptic basal membrane protein agrin initiates the aggregation of acetylcholine receptors at the postsynaptic membrane of the developing neuromuscular junction. Recently, α-dystroglycan was found to be a major agrin-binding protein on the muscle cell surface and was therefore considered a candidate agrin receptor. Employing different truncation fragments of agrin, we determined regions of the protein involved in binding to α-dystroglycan and to heparin, an inhibitor of α-dystroglycan binding. Deletion of a 15-kDa fragment from the C terminus of agrin had no effect on its binding to α-dystroglycan from rabbit muscle membranes, even though this deletion completely abolishes its acetylcholine receptor aggregating activity. Conversely, deletion of a central region does not affect agrin's clustering activity, but reduced its affinity for α-dystroglycan. Combination of these two deletions resulted in a fragment of ~35 kDa that weakly bound to α-dystroglycan, but displayed no clustering activity. All of these fragments bound to heparin with high affinity. Thus, α-dystroglycan does not show the binding specificity expected for an agrin receptor. Our data suggest the existence of an additional component on the muscle cell surface that generates the observed ligand specificity." @default.
- W1520385835 created "2016-06-24" @default.
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- W1520385835 date "1996-03-01" @default.
- W1520385835 modified "2023-10-11" @default.
- W1520385835 title "Agrin Binding to α-Dystroglycan" @default.
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- W1520385835 doi "https://doi.org/10.1074/jbc.271.9.5231" @default.
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