Riboswitches. A riboswitch-containing sRNA controls gene expression by sequestration of a response regulator.

Riboswitches. A riboswitch-containing sRNA controls gene expression by sequestration of a response regulator.
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核糖开关。含核糖开关的SRNA通过隔离反应调节剂来控制基因表达。

DOI:
10.1126/science.1255091
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发表时间:
2014-08-22
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Garsin DA
Garsin DA
中科院分区:
其他
文献类型:
--
作者:
DebRoy S;Gebbie M;Ramesh A;Goodson JR;Cruz MR;van Hoof A;Winkler WC;Garsin DA

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粪肠球菌乙醇胺利用(eut)位点,包含至少19个基因分布在4个多顺反子信使RNA,似乎是由一个单一的腺苷钴胺素(cobalamine,cobalcbl)响应核糖开关。我们报告说,cbcbl结合核糖开关是一个小的,transacting RNA,EutX,其中还包含一个双发夹基板的RNA结合反应调节,EutV的一部分。在没有EutCbl的情况下,EutX使用这种结构来隔离EutV。已知EutV通过结合重叠终止子的双发夹结构来调节eut信使RNA,从而防止转录终止。在EutV Cbl存在下,EutV不能结合EutX,而是引起多个eut基因的转录通读。这项工作介绍了核糖开关介导的控制蛋白质螯合作为一种转录后机制,以协调调节基因表达。
The ethanolamine utilization (eut) locus of Enterococcus faecalis, containing at least 19 genes distributed over four polycistronic messenger RNAs, appears to be regulated by a single adenosyl cobalamine (AdoCbl)–responsive riboswitch. We report that the AdoCbl-binding riboswitch is part of a small, transacting RNA, EutX, which additionally contains a dual-hairpin substrate for the RNA binding–response regulator, EutV. In the absence of AdoCbl, EutX uses this structure to sequester EutV. EutV is known to regulate the eut messenger RNAs by binding dual-hairpin structures that overlap terminators and thus prevent transcription termination. In the presence of AdoCbl, EutV cannot bind to EutX and, instead, causes transcriptional read through of multiple eut genes. This work introduces riboswitch-mediated control of protein sequestration as a posttranscriptional mechanism to coordinately regulate gene expression.
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