Discovery of new azoles with potent activity against Candida spp. and Candida albicans biofilms through virtual screening

Küçük Resim Yok

Tarih

2019

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Elsevier France-Editions Scientifiques Medicales Elsevier

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

Systemic candidiasis is a rampant bloodstream infection of Candida spp. and C. albicans is the major pathogen isolated from infected humans. Azoles, the most common class of antifungals which suffer from increasing resistance, and especially intrinsically resistant non-albicans Candida (NAC) species, act by inhibiting fungal lanosterol 14 alpha-demethylase (CYP51). In this study we identified a number of azole compounds in 1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethanol/ethanone oxime ester structure through virtual screening using consensus scoring approach, synthesized and tested them for their antifungal properties. We reached several hits with potent activity against azole-susceptible and azoleresistant Candida spp. as well as biofilms of C albicans. 5i's minimum inhibitor concentration (MIC) was 0.125 mu g/ml against C. albicans, 0.5 mu g/ml against C. krusei and 1 mu g/ml against azole-resistant C. tropicalis isolate. Considering the MIC values of fluconazole against these fungi (0.5, 32 and 512 mu g/ml, respectively), 5i emerged as a highly potent derivative. The minimum biofilm inhibitor concentration (MBIC) of 5c, 5j, and 5p were 0.5 mu g/ml (and 5i was 2 mu g/ml) against C. albicans biofilms, lower than that of amphotericin B (4 mu g/ml), a first-line antifungal with antibiofilm activity. In addition, the active compounds showed neglectable toxicity to human monocytic cell line. We further analyzed the docking poses of the active compounds in C. albicans CYP51 (CACYP51) homology model catalytic site and identified molecular interactions in agreement with those of known azoles with fungal CYP51s and mutagenesis studies of CACYP51. We observed the stability of CACYP51 in complex with 5i in molecular dynamics simulations. (C) 2019 Elsevier Masson SAS. All rights reserved.

Açıklama

Anahtar Kelimeler

Consensus scoring, Azoles, Candida albicans, Biofilm, Cytotoxicity, Molecular docking, Molecular dynamics simulations

Kaynak

European Journal of Medicinal Chemistry

WoS Q Değeri

Q1

Scopus Q Değeri

Q1

Cilt

179

Sayı

Künye