Biology:CspA mRNA 5′ UTR
| cspA 5' UTR | |
|---|---|
 Conserved secondary structure of the 5' UTR of cspA RNA | |
| Identifiers | |
| Symbol | cspA 5'UTR |
| Rfam | RF01766 |
| Other data | |
| RNA type | Cis-reg; Thermoregulator; |
| Domain(s) | Enterobacteriales |
| PDB structures | PDBe |
cspA mRNA 5' UTR is the untranslated region of the cspA gene, which is important in the cold shock response in Enterobacteriales such as E. coli. The 5' UTR element acts as an RNA thermometer, regulating the expression of cspA in response to temperature.[1] By regulating temperature, cspA proteins carry out the vital function of homeostasis.
The 5' UTR was first suspected to be significant when mutations within this region of cspA significantly increased the stability of the transcript at 37°C.[2]
The secondary structure of cspA mRNA changes in response to temperature; at 37 °C the transcript is unstable and less efficiently translated than at lower temperatures.[3] Unlike other RNA thermometers (such as FourU), the secondary structure is not reliant on the melting of a hairpin in order to affect gene expression. Instead, in temperatures below 20 °C a cis-regulatory region of ncRNA in the 5' UTR of cspA presents the Shine-Dalgarno sequence and AUG start codon to the ribosome in a more accessible way. The precise mechanism for changing the mRNA conformation is unknown.[1] cspA protein is then produced in significantly higher quantities, making up over 2% of the cell's proteome during cold shock.[4] cspA protein binds Hfq, which upregulates production of sigma factors which mediate a stress response.[5]
See also
- Hfq binding sRNA
- ROSE element
References
- ↑ 1.0 1.1 "The cspA mRNA is a thermosensor that modulates translation of the cold-shock protein CspA". Mol. Cell 37 (1): 21–33. January 2010. doi:10.1016/j.molcel.2009.11.033. PMID 20129052.
- ↑ "Mutation analysis of the 5' untranslated region of the cold shock cspA mRNA of Escherichia coli". J. Bacteriol. 181 (20): 6284–6291. October 1999. doi:10.1128/JB.181.20.6284-6291.1999. PMID 10515916.
- ↑ Breaker RR (January 2010). "RNA switches out in the cold". Mol. Cell 37 (1): 1–2. doi:10.1016/j.molcel.2009.12.032. PMID 20129048.
- ↑ "Massive presence of the Escherichia coli 'major cold-shock protein' CspA under non-stress conditions". EMBO J. 18 (6): 1653–1659. March 1999. doi:10.1093/emboj/18.6.1653. PMID 10075935.
- ↑ "Interactions of the RNA-binding protein Hfq with cspA mRNA, encoding the major cold shock protein". J. Bacteriol. 192 (10): 2482–2490. May 2010. doi:10.1128/JB.01619-09. PMID 20233932.
Further reading
- "Major cold shock protein of Escherichia coli". Proc. Natl. Acad. Sci. U.S.A. 87 (1): 283–287. January 1990. doi:10.1073/pnas.87.1.283. PMID 2404279. Bibcode: 1990PNAS...87..283G.
- "Transcriptional and post-transcriptional control of cold-shock genes". J. Mol. Biol. 331 (3): 527–539. August 2003. doi:10.1016/S0022-2836(03)00732-0. PMID 12899826.
- "RNA thermometers". FEMS Microbiol. Rev. 30 (1): 3–16. January 2006. doi:10.1111/j.1574-6976.2005.004.x. PMID 16438677.
- De La Fuente, M.; Valera, S.; Martínez-Guitarte, J. L. (2012). "NcRNAs and thermoregulation: A view in prokaryotes and eukaryotes". FEBS Letters 586 (23): 4061–4069. doi:10.1016/j.febslet.2012.10.018. PMID 23098758.
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