Winkler Wade C, Cohen-Chalamish Smadar, Breaker Ronald R
Department of Molecular, Cellular, and Developmental Biology, Yale University, P.O. Box 208103, New Haven, CT 06520-8103, USA.
Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):15908-13. doi: 10.1073/pnas.212628899. Epub 2002 Nov 27.
The RFN element is a highly conserved domain that is found frequently in the 5'-untranslated regions of prokaryotic mRNAs that encode for flavin mononucleotide (FMN) biosynthesis and transport proteins. We report that this domain serves as the receptor for a metabolite-dependent riboswitch that directly binds FMN in the absence of proteins. Our results also indicate that in Bacillus subtilis, the riboswitch most likely controls gene expression by causing premature transcription termination of the ribDEAHT operon and precluding access to the ribosome-binding site of ypaA mRNA. Sequence and structural analyses indicate that the RFN element is a natural FMN-binding aptamer, the allosteric character of which is harnessed to control gene expression.
RFN元件是一个高度保守的结构域,常见于编码黄素单核苷酸(FMN)生物合成和转运蛋白的原核mRNA的5'非翻译区。我们报告称,该结构域作为一种代谢物依赖性核糖开关的受体,在没有蛋白质的情况下直接结合FMN。我们的结果还表明,在枯草芽孢杆菌中,该核糖开关很可能通过导致ribDEAHT操纵子的转录提前终止并阻止ypaA mRNA的核糖体结合位点被识别来控制基因表达。序列和结构分析表明,RFN元件是一种天然的FMN结合适体,其变构特性被用于控制基因表达。