Polyadenylation of a functional mRNA controls gene expression in Escherichia coli.

Polyadenylation of a functional mRNA controls gene expression in Escherichia coli.
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DOI:
10.1093/nar/gkm120
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发表时间:
2007
影响因子:
14.9
通讯作者:
Hajnsdorf E
Hajnsdorf E
中科院分区:
生物学2区
文献类型:
--
作者:
Joanny G;Le Derout J;Bréchemier-Baey D;Labas V;Vinh J;Régnier P;Hajnsdorf E

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Although usually implicated in the stabilization of mRNAs in eukaryotes, polyadenylation was initially shown to destabilize RNA in bacteria. All the data are consistent with polyadenylation being part of a quality control process targeting folded RNA fragments and non-functional RNA molecules to degradation. We report here an example in Escherichia coli, where polyadenylation directly controls the level of expression of a gene by modulating the stability of a functional transcript. Inactivation of poly(A)polymerase I causes overexpression of glucosamine–6-phosphate synthase (GlmS) and both the accumulation and stabilization of the glmS transcript. Moreover, we show that the glmS mRNA results from the processing of the glmU-glmS cotranscript by RNase E. Interestingly, the glmU-glmS cotranscript and the mRNA fragment encoding GlmU only slightly accumulated in the absence of poly(A)polymerase, suggesting that the endonucleolytically generated glmS mRNA harbouring a 5′ monophosphate and a 3′ stable hairpin is highly susceptible to poly(A)-dependent degradation.
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