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The Biosynthesis of Catecholamines in Two Genera of Protozoa

From the ¹ From the Biological Laboratory, Amherst College, Amherst, Massachusetts

Norepinephrine was isolated from the flagellated protozoan, Crithidia fasciculata, and the ciliated protozoan, Tetrahymena pyriformis, the former having less than one-half that of the latter. Tetrahymena also synthesizes epinephrine, whereas this substance could not be detected in Crithidia. Isotopically labeled phenylalanine, tyrosine, and dihydroxyphenylalanine were significantly incorporated into the catecholamines in Tetrahymena, while only tyrosine and dihydroxyphenylalanine were incorporated in Crithidia, owing to its lack of a phenylalanine-hydroxylating system.

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