the concentrations of isoaccepting trnasthr are selectively changed by a mutation causing a fourfold overproduction of the cognate aminoacyl-trna-synthetase , the threonyl-trna synthetase , whereas the distribution of isoaccepting trnas of four control trna-species in these e. coli mutants was not affected by that mutation .
C0002529
aminoacyl-trna-synthetase
C0040011
threonyl-trna synthetase