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| Content Provider | PubMed Central |
|---|---|
| Author | Carabetta, Valerie J. Mohanty, Bijoy K. Kushner, Sidney R. Silhavy, Thomas J. |
| Copyright Year | 2009 |
| Abstract | In Escherichia coli, the adaptor protein SprE (RssB) controls the stability of the alternate sigma factor RpoS (σ38 and σS). When nutrients are abundant, SprE binds RpoS and delivers it to ClpXP for degradation, but when carbon sources are depleted, this process is inhibited. It also has been noted that overproduction of SprE is toxic. Here we show that null mutations in pcnB, encoding poly(A) polymerase I (PAP I), and in hfq, encoding the RNA chaperone Hfq, suppress this toxicity. Since PAP I, in conjunction with Hfq, is responsible for targeting RNAs, including mRNAs, for degradation by adding poly(A) tails onto their 3′ ends, these data indicate that SprE helps modulate the polyadenylation pathway in E. coli. Indeed, in exponentially growing cells, sprE deletion mutants exhibit significantly reduced levels of polyadenylation and increased stability of specific mRNAs, similar to what is observed in a PAP I-deficient strain. In stationary phase, we show that SprE changes the intracellular localization of PAP I. Taken together, we propose that SprE plays a multifunctional role in controlling the transcriptome, regulating what is made via its effects on RpoS, and modulating what is degraded via its effects on polyadenylation and turnover of specific mRNAs. |
| Related Links | http://dx.doi.org/10.1128/jb.00870-09 |
| Ending Page | 6821 |
| Page Count | 10 |
| Starting Page | 6812 |
| File Format | |
| ISSN | 00219193 |
| e-ISSN | 10985530 |
| Journal | Journal of Bacteriology |
| Issue Number | 22 |
| Volume Number | 191 |
| Language | English |
| Publisher | American Society for Microbiology (ASM) |
| Publisher Date | 2009-11-15 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology (ASM) |
| Subject Keyword | Molecular Biology Microbiology Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Microbiology |
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