Small RNA-mediated activation of sugar phosphatase mRNA regulates glucose homeostasis.

Small RNA-mediated activation of sugar phosphatase mRNA regulates glucose homeostasis.
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DOI:
10.1016/j.cell.2013.03.003
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发表时间:
2013-04-11
期刊:
影响因子:
64.5
通讯作者:
Vogel J
Vogel J
中科院分区:
生物学1区
文献类型:
--
作者:
Papenfort K;Sun Y;Miyakoshi M;Vanderpool CK;Vogel J

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葡萄糖稳态在生活的各个领域都受到严格控制。不能平衡细胞内糖水平和处理潜在有毒磷酸糖的细菌停止生长并有被竞争对手击败的风险。在这里,我们确定了保守的卤酸脱卤酶(HAD)样酶YigL作为先前假设的磷酸酶解毒的磷酸糖,并揭示其合成激活的Hfq依赖小RNA在鼠伤寒沙门氏菌。我们表明,葡萄糖-6-P-响应的小RNA SgrS激活合成YigL在一个不依赖于抑制的方式,通过选择性稳定的衰变中间体的双顺反子pldB-yigL mRNA。有趣的是,主要的核糖核酸内切酶RNase E,以前已知与小RNA一起发挥作用以降解mRNA靶标,也是mRNA激活过程所必需的。利用和有针对性的干扰这里描述的常规RNA周转可能构成一个通用的小RNA快速激活编码和非编码基因的途径。
Glucose homeostasis is strictly controlled in all domains of life. Bacteria that are unable to balance intracellular sugar levels and deal with potentially toxic phosphosugars cease growth and risk being outcompeted. Here, we identify the conserved haloacid dehalogenase (HAD)-like enzyme YigL as the previously hypothesized phosphatase for detoxification of phosphosugars, and reveal that its synthesis is activated by an Hfq dependent small RNA in Salmonella typhimurium. We show that the glucose-6-P-responsive small RNA SgrS activates synthesis YigL in a translation-independent fashion, by the selective stabilization of a decay intermediate of the dicistronic pldB-yigL mRNA. Intriguingly, the major endoribonuclease RNase E, previously known to function together with small RNAs to degrade mRNA targets, is also essential for this process of mRNA activation. The exploitation of and targeted interference with regular RNA turnover described here may constitute a general route for small RNAs to rapidly activate both coding and noncoding genes.
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