in escherichia coli k-12 , the heat shock protein dnak and dnaj participate in phosphorylation of both glutaminyl-trna synthetase and threonyl-trna synthetase since when cellular proteins extracted from the dnak7 ( ts ) , dnak756 ( ts ) and dnaj259 ( ts ) mutant cells labeled with 32pi at 42 degrees c were analyzed by two-dimensional gel electrophoresis , no phosphorylation of glutaminyl-trna synthetase and threonyl-trna synthetase was observed while phosphorylation of both aminoacyl-trna synthetases was detected in the samples extracted from wild-type cells .
C0040011
threonyl-trna synthetase
C0002529
aminoacyl-trna synthetases