Incorporation of methionine by a soluble enzyme system from Escherichia coli |
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Authors: | Hiroo Horinishi Shuichi Hashizume Masaharu Seguchi Kazuko Takahashi |
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Affiliation: | Laboratory of Biological Chemistry Food Research Institute of Morinaga & Co. Shimosueyoshi 2-1-1, Tsurumi-ku, Yokohama, Japan 230 |
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Abstract: | A soluble fraction from Escherichia coli B was found to incorporate methionine into 95°C CCl3COOH-insoluble fraction. The incorporation required methionyl-tRNA synthetase, methionine tRNA, ATP, Mg2+ and bovine milk casein. The casein could be replaced by arginylated bovine serum albumin and arginylated bovine α-lactalbumin. A mixture of 19 amino acids other than methionine and GTP had no effect on the incorporation. KCl was rather inhibitory. Puromycin, RNase A and trypsin inhibited the incorporation, while DNase I did not. The soluble fraction also incorporated the methionyl moiety of methionyl-tRNA. This incorporation was not affected by the addition of free methionine. |
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