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Studies on the Formation of γ-Aminobutyric Acid from Putrescine in Rat Organs and Purification of Its Synthetic Enzyme from Rat Intestine

Tsuji Motohiro, Teruo Nakajima

Abstract

The formation of gamma-aminobutyric acid (GABA) from putrescine was examined in organs of rats using radioactive putrescine. Radioactive GABA was detected in all the organs of a rat injected intraperitoneally with radioactive putrescine, and the highest radioactivity of GABA was observed in the small intestine. The enzyme involved in this formation was purified from small intestine and identified as a diamine oxidase, histaminase, from the properties of the enzyme. Activity of the enzyme was found in all the organs of rat, and the highest activity was observed in the small intestine.

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Key concepts: Diamine oxidase, Putrescine, Enzyme, Amine oxidase (copper-containing), Small intestine, Biochemistry, gamma-Aminobutyric acid, Aminobutyric acid