Nomura M, Yates J L, Dean D, Post L E
Proc Natl Acad Sci U S A. 1980 Dec;77(12):7084-8. doi: 10.1073/pnas.77.12.7084.
Certain ribosomal proteins (r proteins) in Escherichia coli, such as S4 and S7, function as feedback repressors in the regulation of r-protein synthesis. These proteins inhibit the translation of their own mRNA. The repressor r proteins so far identified are also known to bind specifically to rRNA at an initial stage in ribosome assembly. We have found structural homology between the S7 binding region on 16S rRNA and a region of the mRNA where S7 acts as a translational repressor. Similarly, there is structural homology between one of the reported S4 binding regions on 16S rRNA and the mRNA target site for S4. The observed homology supports the concept that regulation by repressor r proteins is based on competition between rRNA and mRNA for these proteins and that the same structural features and of the r proteins are used in their interactions with both rRNA and mRNA.
大肠杆菌中的某些核糖体蛋白(r蛋白),如S4和S7,在r蛋白合成的调控中作为反馈阻遏物发挥作用。这些蛋白抑制其自身mRNA的翻译。目前已鉴定出的阻遏r蛋白在核糖体组装的初始阶段也能特异性结合rRNA。我们发现16S rRNA上的S7结合区域与S7作为翻译阻遏物作用的mRNA区域之间存在结构同源性。同样,16S rRNA上报道的S4结合区域之一与S4的mRNA靶位点之间也存在结构同源性。观察到的同源性支持了这样一种概念,即阻遏r蛋白的调控基于rRNA和mRNA对这些蛋白的竞争,并且r蛋白在与rRNA和mRNA的相互作用中使用相同的结构特征。