bacteriophage t4-induced modification of escherichia coli vlayl-trna synthetase ( ec 6.1.1.9 ) requires : synthesis of a phage-gene specified tau factor , addition of the factor to host valyl-trna synthetase to produce a urea-stable enzyme , and interaction of the modified enzyme with trna to produce a more rapidly sedimenting valyl-trna synthetase activity on sucrose density gradients .
C0002529
trna synthetase
C0042301
valyl-trna synthetase