during different steady state growth conditions in escherichia coli the level of the three trna-modifying enzymes , the trna ( m5urd ) - , trna ( m1guo ) - and trna ( mam5s2urd ) methyltransferase and of five aminoacyl-trna synthetases , the leucyl- , valyl- , isoleucyl- , arginyl- and threonyl-trna-synthetase , has been determined .
C0002529
aminoacyl-trna synthetases
C0040011
threonyl-trna-synthetase