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A highly sensitive assay of tRNA aminoacylation was developed that directly measures the fraction of aminoacylated tRNA by following amino acid attachment to the 3'-(32)P-labeled tRNA. When applied to Escherichia coli alanyl-tRNA synthetase, the assay allowed accurate measurement of aminoacylation of the most deleterious mutants of tRNA(Ala). The effect of tRNA(Ala) identity mutations on both aminoacylation efficiency (k(cat)/K(M)) and steady-state level of aminoacyl-tRNA was evaluated in the absence and presence of inorganic pyrophosphatase and elongation factor Tu. Significant levels of aminoacylation were achieved for tRNA mutants even when the k(cat)/K(M) value is reduced by as much as several thousandfold. These results partially reconcile the discrepancy between in vivo and in vitro analysis of tRNA(Ala) identity.

Modulation of tRNA Ala identity by inorganic pyrophosphatase

Modulation of tRNA ^Ala identity by inorganic pyrophosphatase