title: Structure/activity relations of N-methyl-D-aspartate receptor ligands as studied by their inhibition of [3H]D-2-amino-5-phosphonopentanoic acid binding in rat brain membranes.
abstract: Structure/activity relations of agonists and antagonists for the N-methyl-D-aspartate receptor have been investigated by measuring the ability of a large range of substances to inhibit binding of [3H]2-amino-5-phosphonopentanoate to rat brain membranes. A major difference between optimum structures for agonist and antagonist activity lay in the differential effectiveness of sulphonic and phosphonic acid groups as the omega-acidic terminal in these two types of compound. The sulphonic acid moiety was an effective omega-acidic terminal in short chain agonists, but not in longer chain antagonists, while the phosphonic acid group was the most effective omega-acidic terminal in longer chain antagonists, but was only very weakly active in short chain agonists. It is proposed that the binding site of the omega-acidic terminal of antagonists is different from that for the omega-acidic group of agonists. Other structural features conducive to effective interaction of ligands with the receptor are discussed.
mesh_terms: D015763:2-Amino-5-phosphonovalerate; D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D001667:Binding, Competitive; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D007700:Kinetics; D008968:Molecular Conformation; D051381:Rats; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter / Q000187:drug effects / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013347:Subcellular Fractions / Q000378:metabolism; D014633:Valine / Q000031:analogs & derivatives* / Q000378:metabolism
chemical_list: D000596:Amino Acids; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter; D015763:2-Amino-5-phosphonovalerate; D014633:Valine