Atherly A G
J Bacteriol. 1973 Jan;113(1):178-82. doi: 10.1128/jb.113.1.178-182.1973.
A temperature-sensitive elongation factor G (EF-G) mutation carried by a rel strain of Escherichia coli was transferred to a rel(+) strain. The recombinant (AA-10) was found to be temperature-sensitive "relaxed" for ribonucleic acid (RNA) regulation. However, when a temperature-sensitive EF-G is present in a strain temperature-sensitive for valyl-transfer RNA (tRNA) synthetase, this new strain (AA-16) is no longer temperature-sensitive "relaxed" for RNA regulation. In strain AA-10, all tRNAs remain fully charged, and in AA-16 tRNA(val) becomes completely discharged at the nonpermissive growth temperature. Also, synthesis of ppGpp is not observed in strain AA-10 at 42 C but is observed at 42 C in strain AA-16.
将一株携带温度敏感型延伸因子G(EF-G)突变的大肠杆菌rel菌株的突变基因转移到rel(+)菌株中。发现重组菌株(AA-10)在核糖核酸(RNA)调控方面对温度敏感且呈现“松弛”状态。然而,当在一株对缬氨酰转移RNA(tRNA)合成酶温度敏感的菌株中存在温度敏感型EF-G时,这个新菌株(AA-16)在RNA调控方面不再对温度敏感且呈现“松弛”状态。在AA-10菌株中,所有tRNA都保持完全充电状态,而在AA-16菌株中,在非允许生长温度下tRNA(val)会完全放电。此外,在42℃时,AA-10菌株中未观察到ppGpp的合成,但在42℃时AA-16菌株中可观察到ppGpp的合成。