title: Inhibition of glutamate-aspartate transaminase by beta-methylene-DL-aspartate.
abstract: beta-Methylene-DL-aspartate, a new beta, gamma-unsaturated amino acid, is an irreversible inhibitor of soluble pig heart glutamate-aspartate transaminase (Ki approximately 3 mM with respect to the L-form; limiting rate constant for inactivation approximately 0.4 min-1). The new amino acid is the most specific inhibitor of glutamate-aspartate transaminase thus far studied. It does not inactivate pig heart glutamate-alanine transaminase, soluble rat kidney glutamine transaminase K, gamma-aminobutyrate transaminase (from Pseudomonas fluorescens), glutamate decarboxylase (Escherichia coli), snake venom L-amino acid oxidase, or hog kidney D-amino acid oxidase. In addition, the following enzymes were not inhibited by beta-methylene-DL-aspartate in rat tissue homogenates: gamma-aminobutyrate transaminase (brain), tyrosine transaminase (liver), glutamine transaminase L (liver), asparagine, transaminase (liver), ornithine transaminase (liver) or branch-chain transaminase(s) (kidney). Intraperitoneal injection of beta-methylene-DL-aspartate into mice decreased kidney and liver glutamate-aspartate transaminase activities but had no effect on liver glutamate-alanine transaminase activity.
mesh_terms: D000594:Amino Acid Oxidoreductases / Q000037:antagonists & inhibitors; D000818:Animals; D001219:Aspartate Aminotransferases / Q000037:antagonists & inhibitors*; D001224:Aspartic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D001921:Brain / Q000201:enzymology; D007668:Kidney / Q000201:enzymology; D008099:Liver / Q000201:enzymology; D008297:Male; D051379:Mice; D009206:Myocardium / Q000201:enzymology; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity; D013552:Swine; D000637:Transaminases / Q000037:antagonists & inhibitors
chemical_list: D001224:Aspartic Acid; C036683:beta-methyleneaspartate; D000594:Amino Acid Oxidoreductases; D000637:Transaminases; D001219:Aspartate Aminotransferases