Gram‐Scale Purification of Methionyl‐tRNA and Tyrosyl‐tRNA Synthetases from Escherichia coli

Abstract
A procedure is presented for the purification of 3 g of homogeneous methionyl-tRNA synthetase and 1 g of homogeneous tyrosyl-tRNA synthetase from 50 kg batches of Escherichia coli. The procedure permits the isolation of many enzymes simultaneously and the elution positions of seven other aminoacyl-tRNA synthetases, catalase, rhodanese, phosphofructokinase, elongation factor Tu and cytochrome b-562 are indicated. The problems of extraction work on this scale are discussed.