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The σB-dependent regulatory sRNA Rli47 represses isoleucine biosynthesis in Listeria monocytogenes through a direct interaction with the ilvA transcript
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).ORCID iD: 0000-0002-0904-497X
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2019 (English)In: RNA Biology, ISSN 1547-6286, E-ISSN 1555-8584Article in journal (Refereed) Epub ahead of print
Abstract [en]

The facultative intracellular pathogen Listeria monocytogenes can persist and grow in a diverse range of environmental conditions, both outside and within its mammalian host. The alternative sigma factor Sigma B (sigma(B)) plays an important role in this adaptability and is critical for the transition into the host. While some of the functions of the sigma(B) regulon in facilitating this transition are understood the role of sigma(B)-dependent small regulatory RNAs (sRNAs) remain poorly characterized. In this study, we focused on elucidating the function of Rli47, a sigma(B)-dependent sRNA that is highly induced in the intestine and in macrophages. Using a combination of in silico and in vivo approaches, a binding interaction was predicted with the Shine-Dalgarno region of the ilvA mRNA, which encodes threonine deaminase, an enzyme required for branched-chain amino acid biosynthesis. Both ilvA transcript levels and threonine deaminase activity were increased in a deletion mutant lacking the rli47 gene. The Delta rli47 mutant displayed a shorter growth lag in isoleucine-depleted growth media relative to the wild-type, and a similar phenotype was also observed in a mutant lacking sigma(B). The impact of the Delta rli47 on the global transcription profile of the cell was investigated using RNA-seq, and a significant role for Rli47 in modulating amino acid metabolism was uncovered. Taken together, the data point to a model where Rli47 is responsible for specifically repressing isoleucine biosynthesis as a way to restrict growth under harsh conditions, potentially contributing to the survival of L. monocytogenes in niches both outside and within the mammalian host.

Place, publisher, year, edition, pages
Taylor & Francis, 2019.
Keywords [en]
Listeria monocytogenes, Rli47, Sigma B, Isoleucine biosynthesis, ilvA, sRNA, Threonine deaminase
National Category
Microbiology in the medical area
Identifiers
URN: urn:nbn:se:umu:diva-161849DOI: 10.1080/15476286.2019.1632776ISI: 000475257200001PubMedID: 31242083OAI: oai:DiVA.org:umu-161849DiVA, id: diva2:1341387
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-08-08

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Johansson, JörgenIgnatov, Dmitriy

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Marinho, Catarina M.Johansson, JörgenIgnatov, DmitriyGuerreiro, Duarte N.
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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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RNA Biology
Microbiology in the medical area

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