Gamma-Aminobutyric Acid(redirected from 4-aminobutanoic acid)
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NH2CH2CH2CH2COOH, an acid formed by the decarboxylation of glutaminic acid under the action of the enzyme decarboxylase. In the body, metabolism of gamma-aminobutyric acid gives succinic acid, which participates in the tricarboxylic acid cycle. Free gamma-aminobutyric acid is found in many plants. In higher mammals gamma-aminobutyric acid is only found in the brain, where its concentration reaches 100 mg percent. Gamma-aminobutyric acid is assumed to exert a retarding action on nerve activity, which is apparently associated with its effect on the permeability of biological membranes.