Cross talk between ABC transporter mRNAs via a target mRNA-derived sponge of the GcvB small RNA.

Cross talk between ABC transporter mRNAs via a target mRNA-derived sponge of the GcvB small RNA.
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DOI:
10.15252/embj.201490546
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发表时间:
2015-06-03
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Vogel J
Vogel J
中科院分区:
其他
文献类型:
--
作者:
Miyakoshi M;Chao Y;Vogel J

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有越来越多的例子表明,一种信使核糖核酸可以在转录后影响其他信使核糖核酸的表达。这可能涉及到将mRNAs的调控RNA隔离在同一调节子中的RNA海绵,但这种mRNAs串扰的潜在分子机制仍然知之甚少。在这里,我们报告了海绵介导的mRNA串扰在GcvB的转录后网络中,GcvB是一种保守的依赖于Hfq的小RNA,具有已知的细菌中最大的调节子之一。我们发现,编码氨基酸ABC转运蛋白的gltIJKL基因座的mRNA衰退会产生一个稳定的片段(SroC),该片段与GcvB碱基对。这种相互作用触发了RNase E对GcvB的降解,减轻了GcvB介导的其他氨基酸相关运输和代谢基因的mRNA抑制。有趣的是,由于gltIJKL mRNA本身是GcvB的靶标,SroC海绵似乎既使内部前馈环路激活其顺式基因中的亲本mRNA,又激活同一途径中的许多反式编码的mRNAs。当多肽是唯一的碳和氮源时,禁用这种信使核糖核酸串扰会影响细菌的生长。
There is an expanding list of examples by which one mRNA can posttranscriptionally influence the expression of others. This can involve RNA sponges that sequester regulatory RNAs of mRNAs in the same regulon, but the underlying molecular mechanism of such mRNA cross talk remains little understood. Here, we report sponge-mediated mRNA cross talk in the posttranscriptional network of GcvB, a conserved Hfq-dependent small RNA with one of the largest regulons known in bacteria. We show that mRNA decay from the gltIJKL locus encoding an amino acid ABC transporter generates a stable fragment (SroC) that base-pairs with GcvB. This interaction triggers the degradation of GcvB by RNase E, alleviating the GcvB-mediated mRNA repression of other amino acid-related transport and metabolic genes. Intriguingly, since the gltIJKL mRNA itself is a target of GcvB, the SroC sponge seems to enable both an internal feed-forward loop to activate its parental mRNA in cis and activation of many trans-encoded mRNAs in the same pathway. Disabling this mRNA cross talk affects bacterial growth when peptides are the sole carbon and nitrogen sources.
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