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Abstract
The mechanism of inhibition of polypeptide synthesis by the addition of a tRNA fraction in a rat liver cell-free system was studied. The inhibition was found to occur at the step of aminoacyl-tRNA binding to ribosomes, in which aminoacyl-tRNA's were mainly responsible for the inhibition. The addition of EF-1 decreased the inhibition by the tRNA fraction. The tRNA fraction inhibited polypeptide synthesis in a polysome-S100 system under conditions in which poly U- and poly A-dependent polypeptide syntheses were not inhibited. The possibility that the aminoacyl-tRNA inhibitory activity functions through improper binding to the ribosomes in the polysome-S100 system is discussed.
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