IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.

Transcriptional activation of σ(54)-dependent promoters is usually tightly regulated in response to environmental cues. The high abundance of potential σ(54)-dependent promoters in the anaerobe bacteria, Desulfovibrio vulgaris Hildenborough, reflects the high versatility of this bacteria suggesting...

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Autores principales:	Anouchka Fiévet, Eric Cascales, Odile Valette, Alain Dolla, Corinne Aubert
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b5d5d57e49974af28fd17f4785351de5
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spelling	oai:doaj.org-article:b5d5d57e49974af28fd17f4785351de52021-11-18T08:36:45ZIHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.1932-620310.1371/journal.pone.0086507https://doaj.org/article/b5d5d57e49974af28fd17f4785351de52014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24466126/?tool=EBIhttps://doaj.org/toc/1932-6203Transcriptional activation of σ(54)-dependent promoters is usually tightly regulated in response to environmental cues. The high abundance of potential σ(54)-dependent promoters in the anaerobe bacteria, Desulfovibrio vulgaris Hildenborough, reflects the high versatility of this bacteria suggesting that σ(54) factor is the nexus of a large regulatory network. Understanding the key players of σ(54)-regulation in this organism is therefore essential to gain insights into the adaptation to anaerobiosis. Recently, the D. vulgaris orp genes, specifically found in anaerobe bacteria, have been shown to be transcribed by the RNA polymerase coupled to the σ(54) alternative sigma factor. In this study, using in vitro binding experiments and in vivo reporter fusion assays in the Escherichia coli heterologous host, we showed that the expression of the divergent orp promoters is strongly dependent on the integration host factor IHF. Bioinformatic and mutational analysis coupled to reporter fusion activities and mobility shift assays identified two functional IHF binding site sequences located between the orp1 and orp2 promoters. We further determined that the D. vulgaris DVU0396 (IHFα) and DVU1864 (IHFβ) subunits are required to control the expression of the orp operons suggesting that they form a functionally active IHF heterodimer. Interestingly results obtained from the in vivo inactivation of DVU0396, which is required for orp operons transcription, suggest that several functionally IHF active homodimer or heterodimer are present in D. vulgaris.Anouchka FiévetEric CascalesOdile ValetteAlain DollaCorinne AubertPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e86507 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Anouchka Fiévet Eric Cascales Odile Valette Alain Dolla Corinne Aubert IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
description	Transcriptional activation of σ(54)-dependent promoters is usually tightly regulated in response to environmental cues. The high abundance of potential σ(54)-dependent promoters in the anaerobe bacteria, Desulfovibrio vulgaris Hildenborough, reflects the high versatility of this bacteria suggesting that σ(54) factor is the nexus of a large regulatory network. Understanding the key players of σ(54)-regulation in this organism is therefore essential to gain insights into the adaptation to anaerobiosis. Recently, the D. vulgaris orp genes, specifically found in anaerobe bacteria, have been shown to be transcribed by the RNA polymerase coupled to the σ(54) alternative sigma factor. In this study, using in vitro binding experiments and in vivo reporter fusion assays in the Escherichia coli heterologous host, we showed that the expression of the divergent orp promoters is strongly dependent on the integration host factor IHF. Bioinformatic and mutational analysis coupled to reporter fusion activities and mobility shift assays identified two functional IHF binding site sequences located between the orp1 and orp2 promoters. We further determined that the D. vulgaris DVU0396 (IHFα) and DVU1864 (IHFβ) subunits are required to control the expression of the orp operons suggesting that they form a functionally active IHF heterodimer. Interestingly results obtained from the in vivo inactivation of DVU0396, which is required for orp operons transcription, suggest that several functionally IHF active homodimer or heterodimer are present in D. vulgaris.
format	article
author	Anouchka Fiévet Eric Cascales Odile Valette Alain Dolla Corinne Aubert
author_facet	Anouchka Fiévet Eric Cascales Odile Valette Alain Dolla Corinne Aubert
author_sort	Anouchka Fiévet
title	IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
title_short	IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
title_full	IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
title_fullStr	IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
title_full_unstemmed	IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.
title_sort	ihf is required for the transcriptional regulation of the desulfovibrio vulgaris hildenborough orp operons.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/b5d5d57e49974af28fd17f4785351de5
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IHF is required for the transcriptional regulation of the Desulfovibrio vulgaris Hildenborough orp operons.

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