Abstract

The determination of radioactive amino acid incorporation into proteins is important in measurements of protein degradation. Aminoacyl-tRNAs participation in label distribution may interfere during these measurements. To check this possibility, a separate procedure with ion-exchange paper DE 81 allowing the percentage of radioactivity in aminoacyl-tRNA to be determined was developed. After application of microliter amounts of Trametes versicolo myceloum extracts on DE 81 paper circles, stepwise elution with buffers of different pH's and ionic strengths was carried out. This enabled labelled proteins to be separated from labelled aminoacyl-tRNAs and unbound amino acids.

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