The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule

ABSTRACT The stress-responsive alternative sigma factor σB is conserved across diverse Gram-positive bacterial genera. In Listeria monocytogenes, σB regulates transcription of >150 genes, including genes contributing to virulence and to bacterial survival under host-associated stress conditions,...

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Autores principales:	M. Elizabeth Palmer, Soraya Chaturongakul, Martin Wiedmann, Kathryn J. Boor
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2011
Materias:	Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/fc8ab2ce6a5c45d88ea13c040d0c87bf
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spelling	oai:doaj.org-article:fc8ab2ce6a5c45d88ea13c040d0c87bf2021-11-15T15:38:48ZThe <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule10.1128/mBio.00241-112150-7511https://doaj.org/article/fc8ab2ce6a5c45d88ea13c040d0c87bf2011-12-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mBio.00241-11https://doaj.org/toc/2150-7511ABSTRACT The stress-responsive alternative sigma factor σB is conserved across diverse Gram-positive bacterial genera. In Listeria monocytogenes, σB regulates transcription of >150 genes, including genes contributing to virulence and to bacterial survival under host-associated stress conditions, such as those encountered in the human gastrointestinal lumen. An inhibitor of L. monocytogenes σB activity was identified by screening ~57,000 natural and synthesized small molecules using a high-throughput cell-based assay. The compound fluoro-phenyl-styrene-sulfonamide (FPSS) (IC50 = 3.5 µM) downregulated the majority of genes previously identified as members of the σB regulon in L. monocytogenes 10403S, thus generating a transcriptional profile comparable to that of a 10403S ΔsigB strain. Specifically, of the 208 genes downregulated by FPSS, 75% had been identified previously as positively regulated by σB. Downregulated genes included key virulence and stress response genes, such as inlA, inlB, bsh, hfq, opuC, and bilE. From a functional perspective, FPSS also inhibited L. monocytogenes invasion of human intestinal epithelial cells and bile salt hydrolase activity. The ability of FPSS to inhibit σB activity in both L. monocytogenes and Bacillus subtilis indicates its utility as a specific inhibitor of σB across multiple Gram-positive genera. IMPORTANCE The σB transcription factor regulates expression of genes responsible for bacterial survival under changing environmental conditions and for virulence; therefore, this alternative sigma factor is important for transmission of L. monocytogenes and other Gram-positive bacteria. Regulation of σB activity is complex and tightly controlled, reflecting the key role of this factor in bacterial metabolism. We present multiple lines of evidence indicating that fluoro-phenyl-styrene-sulfonamide (FPSS) specifically inhibits activity of σB across Gram-positive bacterial genera, i.e., in both Listeria monocytogenes and Bacillus subtilis. Therefore, FPSS is an important new tool that will enable novel approaches for exploring complex regulatory networks in L. monocytogenes and other Gram-positive pathogens and for investigating small-molecule applications for controlling pathogen transmission.M. Elizabeth PalmerSoraya ChaturongakulMartin WiedmannKathryn J. BoorAmerican Society for MicrobiologyarticleMicrobiologyQR1-502ENmBio, Vol 2, Iss 6 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbiology QR1-502
spellingShingle	Microbiology QR1-502 M. Elizabeth Palmer Soraya Chaturongakul Martin Wiedmann Kathryn J. Boor The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
description	ABSTRACT The stress-responsive alternative sigma factor σB is conserved across diverse Gram-positive bacterial genera. In Listeria monocytogenes, σB regulates transcription of >150 genes, including genes contributing to virulence and to bacterial survival under host-associated stress conditions, such as those encountered in the human gastrointestinal lumen. An inhibitor of L. monocytogenes σB activity was identified by screening ~57,000 natural and synthesized small molecules using a high-throughput cell-based assay. The compound fluoro-phenyl-styrene-sulfonamide (FPSS) (IC50 = 3.5 µM) downregulated the majority of genes previously identified as members of the σB regulon in L. monocytogenes 10403S, thus generating a transcriptional profile comparable to that of a 10403S ΔsigB strain. Specifically, of the 208 genes downregulated by FPSS, 75% had been identified previously as positively regulated by σB. Downregulated genes included key virulence and stress response genes, such as inlA, inlB, bsh, hfq, opuC, and bilE. From a functional perspective, FPSS also inhibited L. monocytogenes invasion of human intestinal epithelial cells and bile salt hydrolase activity. The ability of FPSS to inhibit σB activity in both L. monocytogenes and Bacillus subtilis indicates its utility as a specific inhibitor of σB across multiple Gram-positive genera. IMPORTANCE The σB transcription factor regulates expression of genes responsible for bacterial survival under changing environmental conditions and for virulence; therefore, this alternative sigma factor is important for transmission of L. monocytogenes and other Gram-positive bacteria. Regulation of σB activity is complex and tightly controlled, reflecting the key role of this factor in bacterial metabolism. We present multiple lines of evidence indicating that fluoro-phenyl-styrene-sulfonamide (FPSS) specifically inhibits activity of σB across Gram-positive bacterial genera, i.e., in both Listeria monocytogenes and Bacillus subtilis. Therefore, FPSS is an important new tool that will enable novel approaches for exploring complex regulatory networks in L. monocytogenes and other Gram-positive pathogens and for investigating small-molecule applications for controlling pathogen transmission.
format	article
author	M. Elizabeth Palmer Soraya Chaturongakul Martin Wiedmann Kathryn J. Boor
author_facet	M. Elizabeth Palmer Soraya Chaturongakul Martin Wiedmann Kathryn J. Boor
author_sort	M. Elizabeth Palmer
title	The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
title_short	The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
title_full	The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
title_fullStr	The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
title_full_unstemmed	The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule
title_sort	<named-content content-type="genus-species">listeria monocytogenes</named-content> σ<sup>b</sup> regulon and its virulence-associated functions are inhibited by a small molecule
publisher	American Society for Microbiology
publishDate	2011
url	https://doaj.org/article/fc8ab2ce6a5c45d88ea13c040d0c87bf
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The <named-content content-type="genus-species">Listeria monocytogenes</named-content> σ<sup>B</sup> Regulon and Its Virulence-Associated Functions Are Inhibited by a Small Molecule

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