The ompA 5' untranslated RNA segment functions in Escherichia coli as a growth-rate-regulated mRNA stabilizer whose activity is unrelated to translational efficiency.
AUTOR(ES)
Emory, S A
RESUMO
The 5' untranslated region (UTR) of the long-lived Escherichia coli ompA message can function in vivo as an mRNA stabilizer. Substitution of this ompA mRNA segment for the corresponding segment of the labile bla gene transcripts prolongs their lifetime by a factor of 6. We show here that the function of this ompA mRNA stabilizer requires the presence of a 115-nucleotide ompA RNA segment that lies upstream of the ribosome-binding site. Although deletion of this segment reduced the half-life of the ompA transcript by a factor of 5, its absence had almost no effect on the translational efficiency of ompA mRNA. Like the ompA transcript, but unlike bla mRNA, hybrid ompA-bla messages containing the complete ompA 5' UTR were significantly less stable under conditions of slow bacterial growth. We conclude that the stabilizing activity of the ompA 5' UTR is growth rate regulated and that the mechanism of mRNA stabilization by this RNA segment is not related to the spacing between translating ribosomes.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=213277Documentos Relacionados
- Structure and function of a bacterial mRNA stabilizer: analysis of the 5' untranslated region of ompA mRNA.
- Host factor I, Hfq, binds to Escherichia coli ompA mRNA in a growth rate-dependent fashion and regulates its stability
- The Initiation Codon Affects Ribosome Binding and Translational Efficiency in Escherichia coli of cI mRNA with or without the 5′ Untranslated Leader
- In vivo and in vitro identity of site specific cleavages in the 5' non-coding region of ompA and bla mRNA in Escherichia coli.
- Cleavages in the 5' region of the ompA and bla mRNA control stability: studies with an E. coli mutant altering mRNA stability and a novel endoribonuclease.
