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RNA degradation in Escherichia coli regulated by 3' adenylation and 5' phosphorylation.

机译:大肠杆菌中的RNA降解受3'腺苷酸化和5'磷酸化调节。

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Although polyadenylation has commonly been regarded as a special feature of eukaryotic messenger RNA, there are many reports of polyA tails on bacterial RNA (for example, refs 3-8). In Escherichia coli, adenylation mediated by the pcnB gene greatly accelerates decay of RNA I, an antisense repressor of replication of ColE1 type plasmids that resembles highly structured transfer RNA but shows the rapid turnover characteristic of mRNA. Here we report that both 3' adenylation and 5' phosphorylation affect the rate of digestion of RNA I by the 3' exonuclease, polynucleotide phosphorylase; conversely, mutation of the polynucleotide phosphorylase-encoding pnp gene affects ribonuclease acting at the 5' end. Together these findings indicate that enzymes attacking RNA I at its separate termini can interact functionally. Additionally, our discovery that adenylation-mediated degradation by polynucleotide phosphorylase imparts an mRNA-like half-like to RNA I suggests a possible mechanism to account for the rapid decay of mRNA in E. coli.
机译:尽管聚腺苷酸化通常被认为是真核生物信使RNA的一个特殊特征,但有许多报道说细菌RNA上有polyA尾巴(例如,参考文献3-8)。在大肠杆菌中,由pcnB基因介导的腺苷酸化极大地加速了RNA I的衰减,RNA I是ColE1型质粒复制的反义阻遏物,类似于高度结构化的转移RNA,但显示出mRNA的快速更新特征。在这里,我们报道3'腺苷酸化和5'磷酸化都影响3'核酸外切酶多核苷酸磷酸化酶对RNA I的消化速率。相反,编码多核苷酸磷酸化酶的pnp基因的突变会影响在5'端起作用的核糖核酸酶。这些发现共同表明,攻击位于其独立末端的RNA I的酶可以在功能上相互作用。另外,我们的发现,即多核苷酸磷酸化酶的腺苷酸介导的降解使RNA I产生了类似mRNA的半峰,这提示了一种可能的机制,可以解释大肠杆菌中mRNA的快速降解。

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