Mol Microbiol. 1991 May;5(5):1183-6.

Selenocysteyl-tRNA occurs in the diatom Thalassiosira and in the ciliate Tetrahymena.

Hatfield DL, Lee BJ, Price NM, Stadtman TC.

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Laboratory of Experimental Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.

Abstract

Selenocysteyl-tRNAs that decode UGA were identified previously in animal and bacterial cells and the genes for these tRNAs have been shown to be widespread in animals and eubacteria. In the present study, we identify a selenocysteyl-tRNA that codes for UGA in Thalassiosira pseudonana, which is a diatom, and in Tetrahymena borealis, which is a ciliate. The fact that these very diverse unicellular organisms also contain a selenocysteyl-tRNA suggests that selenocysteine-containing proteins and the use of UGA as a codon for selenocysteine are widespread, if not ubiquitous, in nature.

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Selenocysteyl-tRNA occurs in the diatom Thalassiosira and in the ciliate Tetrahymena.

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