Archive ouverte HAL - Structural and functional studies of the metalloregulator Fur identify a promoter-binding mechanism and its role in Francisella tularensis virulence.

Structural and functional studies of the metalloregulator Fur identify a promoter-binding mechanism and its role in Francisella tularensis virulence.

Abstract : Francisella tularensis is a Gram-negative bacterium causing tularaemia. Classified as possible bioterrorism agent, it may be transmitted to humans via animal infection or inhalation leading to severe pneumonia. Its virulence is related to iron homeostasis involving siderophore biosynthesis directly controlled at the transcription level by the ferric uptake regulator Fur, as presented here together with the first crystal structure of the tetrameric F. tularensis Fur in the presence of its physiological cofactor, Fe2+. Through structural, biophysical, biochemical and modelling studies, we show that promoter sequences of F. tularensis containing Fur boxes enable this tetrameric protein to bind them by splitting it into two dimers. Furthermore, the critical role of F. tularensis Fur in virulence and pathogenesis is demonstrated with a fur-deleted mutant showing an attenuated virulence in macrophage-like cells and mice. Together, our study suggests that Fur is an attractive target of new antibiotics that attenuate the virulence of F. tularensis.
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https://hal.archives-ouvertes.fr/hal-01892638
Contributeur : Nathalie Gon <>
Soumis le : mercredi 10 octobre 2018 - 17:12:35
Dernière modification le : mardi 10 septembre 2019 - 14:29:36

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J. Pérard, S. Nader, M. Levert, L. Arnaud, P. Carpentier, et al.. Structural and functional studies of the metalloregulator Fur identify a promoter-binding mechanism and its role in Francisella tularensis virulence.. Communications Biology, Nature Publishing Group, 2018, 1, pp.93. ⟨10.1038/s42003-018-0095-6⟩. ⟨hal-01892638⟩

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