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An unstructured 5'-coding region of the prfA mRNA is required for efficient translation
Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS).
Univ So Denmark, Dept Biochem & Mol Biol, DK-5230 Odense M, Denmark.
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2012 (English)In: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962, Vol. 40, no 4, 1818-1827 p.Article in journal (Refereed) Published
Abstract [en]

Expression of virulence factors in the human bacterial pathogen Listeria monocytogenes is almost exclusively regulated by the transcriptional activator PrfA. The translation of prfA is controlled by a thermosensor located in the 5'-untranslated RNA (UTR), and is high at 37 degrees C and low at temperatures < 30 degrees C. In order to develop a thermoregulated translational expression system, the 5'-UTR and different lengths of the prfA-coding sequences were placed in front of lacZ. When expressed in Escherichia coli, the beta-galactosidase expression was directly correlated to the length of the prfA-coding mRNA lying in front of lacZ. A similar effect was detected with gfp as a reporter gene in both L. monocytogenes and E. coli, emphasizing the requirement of the prfA-coding RNA for maximal expression. In vitro transcription/translation and mutational analysis suggests a role for the first 20 codons of the native prfA-mRNA for maximal expression. By toe-print and RNA-probing analysis, a flexible hairpin-loop located immediately downstream of the start-codon was shown to be important for ribosomal binding. The present work determines the importance of an unstructured part of the 5'-coding region of the prfA-mRNA for efficient translation.

Place, publisher, year, edition, pages
Oxford, England: Oxford University Press, 2012. Vol. 40, no 4, 1818-1827 p.
Keyword [en]
Listeris-monocytogenes virulence, Escherichia-coli, Bacterial translation, Controls expression, Secondary structure, Ribosome binding, Initiation condon, Gene-expression, Shuttle vectors, Determinants
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-54341DOI: 10.1093/nar/gkr850ISI: 000301069400041OAI: oai:DiVA.org:umu-54341DiVA: diva2:523448
Available from: 2012-04-24 Created: 2012-04-24 Last updated: 2017-12-07Bibliographically approved

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Loh, EdmundMemarpour, FaranakVaitkevicius, KarolisJohansson, Jörgen

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Loh, EdmundMemarpour, FaranakVaitkevicius, KarolisJohansson, Jörgen
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Molecular Infection Medicine Sweden (MIMS)Umeå Centre for Microbial Research (UCMR)Department of Molecular Biology (Faculty of Medicine)
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Nucleic Acids Research
Biochemistry and Molecular Biology

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