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Les récepteurs histidine kinases : structure et distribution chez les eucaryotes et caractérisation fonctionnelle chez l’espèce Scedosporium apiospermum rencontrée au cours de la mucoviscidose.

Abstract : Histidine kinases (HKs) represent a broad family of proteins involved in the perception of environmental signals in bacteria, fungi and plants.These proteins play a major role in stress adaptation, but also in the virulence of many prokaryotic and eukaryotic microorganisms. Although HKs are now well known in bacteria and plants, both structurally and functionally, knowledge about these proteins in other clades of the living tree remains more than fragmentary. Thus the first objective of this work was the in silico exploration of the structure and distribution of HKs in eukaryotic organisms through several bioinformatics studies : i) in the lower fungi, ii)in budding yeasts, and finally iii) across all eukaryotic supergroups. Since HKs are not found in mammals, they have been attracting attention in recent years from the scientific community as new targets for the development of antimicrobials. It is precisely in this context that the experimental part of this project was initiated in the GHEIHP. This team is focusing on the multi-resistant filamentous Scedosporiumapiospermum, which ranks second among the molds capable of chronycally conolizing the lungs of cysticfibrosis patients. Thus, in order to identify new therapeutic targets of the fungus, the second part of this project focused on the functional characterization of HKs in S. apiospermum. In parallel, this study also led us to develop new molecular tools adapted to S. apiospermum for future studies of fluorescence or bioluminescence imaging.
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Anaïs Hérivaux. Les récepteurs histidine kinases : structure et distribution chez les eucaryotes et caractérisation fonctionnelle chez l’espèce Scedosporium apiospermum rencontrée au cours de la mucoviscidose.. Médecine humaine et pathologie. Université d'Angers, 2018. Français. ⟨NNT : 2018ANGE0030⟩. ⟨tel-02918004⟩

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