The Aminoacyladenylate Mechanism in the Aminoacylation Reaction of Yeast Phenylalanyl-tRNA Synthetase

Abstract
It is shown from a combination of rapid quenching and steady-state kinetics that the phenylalanyl-tRNA synthetase from yeast catalyzes the formation of phenylalanyl-tRNA by the aminoacyladenylate pathway at pH 7.8 and 25.degree. C. The rate-determining step at saturating reagent concentrations is not the dissociation of the charged tRNA from the enzyme.