Abstract
A procedure for separating Escherichia coli aminoacyl-tRNA from unacylated tRNA or components of the aminoacylation reaction, thereby achieving an aminoacyl-tRNA product with a very high specific activity, is described. The method utilizes the specific recognition of aminoacyl-tRNA for E. coli protein synthesis elongation factor Tu which has been immobilized on an affinity matrix. The application of the affinity procedure as a means of purifying a single aminoacyl-tRNA from an unfractionated mixture of tRNAs is also discussed.
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