Abstract
Unfractionated rabbit liver tRNA, charged with [3H]methionine by use of rat liver enzymes, was separated into two [3H]methionine-containing fractions by column chromatography on Sepharose 4B. The two fractions were identified as Met-tRNAm Met and Met-tRNAf met by (a) their different ability to form a GTP- -dependent ternary complex with IF-MP, and (b) the absence of the first fraction after selective charging of the tRNA with E. coli amino acyl tRNA synthetase. The methionine residue was without noticeable influence on the separation.