The gene argS encoding arginyl tRNA synthetase (ArgRS) in Escherichia coli has been cloned into the vector pMFT7 5 which allows overproduction of ArgRS. The specific activity of the synthetase in the crude extract of E.

• 编码大肠杆菌精氨酰?t R N A 合成酶（ Arg R S） 的基因arg S 被克隆到p M F T7?5 载体上。