Abstract
Candida albicans is the most common fungal pathogen in hospital-acquired infections, which is extremely harmful to health. The increasing fungal infections is requiring the rapid development of novel antifungal agents. In this study, the antimicrobial activity of CHQS, an enterocin isolated from Enterococcus faecalis TG2 against C. albicans was confirmed by the minimum inhibitory concentration, minimum fungicidal concentration, and time–kill curve. Aniline blue and calcofluor white staining methods showed that CHQS remarkably affected β-1,3-glucan and chitin cell wall components and made cell wall more vulnerable. The C. albicans cell wall rupture and intracellular vacuolation were observed by TEM and SEM. Moreover, CHQS induced the accumulation of intracellular reactive oxygen species and decreased mitochondrial membrane potential. These results suggested that CHQS might have a complex multi-target antimicrobial mechanism against C. albicans. In addition, the use of CHQS combined with amphotericin B showed synergistic antimicrobial effects against C. albicans. In conclusion, enterocin CHQS, a natural product with antimicrobial effect, might has a bright future for the development of new antifungal drugs.
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All data generated or analyzed during this study are included in this published article.
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Abbreviations
- PI:
-
Propidium iodide
- AmB:
-
Amphotericin B
- MIC:
-
Minimum inhibitory concentration
- MFC:
-
Minimum fungicidal concentration
- CLSI:
-
Clinical and laboratory standards institute
- FICI:
-
Fraction inhibitory concentration index
- CSH:
-
Cell surface hydrophobicity
- ROS:
-
Reactive oxygen species
- Δψm:
-
Mitochondrial membrane potential
- CFW:
-
Calcofluor white
- Rh123:
-
Rhodamine 123
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This work was supported by the Key Technology Research and Development Plan of Tianjin Municipal Science and Technology Bureau, China (19YFZCSN00100).
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QW and ZJZ conceived and designed the research. QW and LP constructed the experiments and analyzed the data. QW, ZJZ, YH, and LP conducted the experiments.
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Wang, Q., Pan, L., Han, Y. et al. Antimicrobial Mechanisms of Enterocin CHQS Against Candida albicans. Curr Microbiol 79, 191 (2022). https://doi.org/10.1007/s00284-022-02878-6
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DOI: https://doi.org/10.1007/s00284-022-02878-6