Seno T, Nakamura A, Fukuhara S, Iwata K
Nucleic Acids Res. 1978 May;5(5):1561-70. doi: 10.1093/nar/5.5.1561.
Several noncognate tRNA's from Escherichia coli were mischarged with glutamine by E. coli glutaminyl-tRNA synthetase if dimethylsulfoxide was present in the reaction mixture. Kinetic analysis of the mischarging revealed that dimethyl sulfoxide stimulated the misacylation by affecting the maximum velocity. Several noncognate tRNA's were shown to interact with glutaminyl-tRNA synthetase as measured by their ability to protect the enzyme against thermal inactivation or to replace cognate tRNA in stimulating glutamine-dependent ATP-PPi exchange reaction. These tRNA's, however, did not coincide with those which were mischargeable with glutamine.
如果反应混合物中存在二甲基亚砜,来自大肠杆菌的几种非同源tRNA会被大肠杆菌谷氨酰胺-tRNA合成酶错误地负载谷氨酰胺。对这种错误负载的动力学分析表明,二甲基亚砜通过影响最大反应速度来刺激错误酰化。通过它们保护该酶免受热失活的能力或在刺激谷氨酰胺依赖性ATP-PPi交换反应中取代同源tRNA的能力来测量,结果显示几种非同源tRNA与谷氨酰胺-tRNA合成酶相互作用。然而,这些tRNA与那些可被错误负载谷氨酰胺的tRNA并不一致。