CELL-FREE INCORPORATION OF AMINO ACIDS BY A TROUT-LIVER SYSTEM. HEAT-LABILE AMINOACYL TRANSFERASE ACTIVITY

Abstract
A cell-free system from trout liver that incorporates amino acids into protein has been isolated. The system requires both soluble and particulate fractions, and is similar to those isolated from other organisms.The incorporation of amino acids is extremely heat-labile, and this lability has been localized in the aminoacyl transferase activity of the cell sap. The heat lability of the microsomes may also be related to transferase activity.Ribosomal fractions from trout liver and rat liver incorporate amino acids when incubated with cell sap from rat liver and trout liver, respectively.

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