Identification of a key lysine residue in heat shock protein 90 required for azole and echinocandin resistance in Aspergillus fumigatus.

Détails

ID Serval
serval:BIB_A10A0DCF633A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Identification of a key lysine residue in heat shock protein 90 required for azole and echinocandin resistance in Aspergillus fumigatus.
Périodique
Antimicrobial agents and chemotherapy
Auteur(s)
Lamoth F., Juvvadi P.R., Soderblom E.J., Moseley M.A., Asfaw Y.G., Steinbach W.J.
ISSN
1098-6596 (Electronic)
ISSN-L
0066-4804
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
58
Numéro
4
Pages
1889-1896
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Heat shock protein 90 (Hsp90) is an essential chaperone involved in the fungal stress response that can be harnessed as a novel antifungal target for the treatment of invasive aspergillosis. We previously showed that genetic repression of Hsp90 reduced Aspergillus fumigatus virulence and potentiated the effect of the echinocandin caspofungin. In this study, we sought to identify sites of posttranslational modifications (phosphorylation or acetylation) that are important for Hsp90 function in A. fumigatus. Phosphopeptide enrichment and tandem mass spectrometry revealed phosphorylation of three residues in Hsp90 (S49, S288, and T681), but their mutation did not compromise Hsp90 function. Acetylation of lysine residues of Hsp90 was recovered after treatment with deacetylase inhibitors, and acetylation-mimetic mutations (K27A and K271A) resulted in reduced virulence in a murine model of invasive aspergillosis, supporting their role in Hsp90 function. A single deletion of lysine K27 or an acetylation-mimetic mutation (K27A) resulted in increased susceptibility to voriconazole and caspofungin. This effect was attenuated following a deacetylation-mimetic mutation (K27R), suggesting that this site is crucial and should be deacetylated for proper Hsp90 function in antifungal resistance pathways. In contrast to previous reports in Candida albicans, the lysine deacetylase inhibitor trichostatin A (TSA) was active alone against A. fumigatus and potentiated the effect of caspofungin against both the wild type and an echinocandin-resistant strain. Our results indicate that the Hsp90 K27 residue is required for azole and echinocandin resistance in A. fumigatus and that deacetylase inhibition may represent an adjunctive anti-Aspergillus strategy.
Mots-clé
Antifungal Agents/pharmacology, Aspergillus fumigatus/drug effects, Aspergillus fumigatus/genetics, Aspergillus fumigatus/metabolism, Azoles/pharmacology, Caspofungin, Drug Resistance, Fungal/genetics, Echinocandins/pharmacology, HSP90 Heat-Shock Proteins/chemistry, HSP90 Heat-Shock Proteins/genetics, HSP90 Heat-Shock Proteins/metabolism, Lipopeptides, Lysine/chemistry, Lysine/genetics
Pubmed
Web of science
Open Access
Oui
Création de la notice
03/10/2019 8:47
Dernière modification de la notice
04/10/2019 6:26
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