Cited by 45Antifungal resistance and susceptibilityFungal and yeast genetics researchBacterial biofilms and quorum sensing

Comparative Ploidy Proteomics of Candida albicans Biofilms Unraveled the Role of the AHP1 Gene in the Biofilm Persistence Against Amphotericin B

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Truong, Thuyen, Zeng, Guisheng, Qingsong, Lin, Kwang, Lim Teck, Tong, Cao, Chan, Fong Yee, Wang, Yue, Seneviratne, Chaminda Jayampath·2016·Molecular & Cellular Proteomics

Abstract

Candida albicans is a major fungal pathogen causing lethal infections in immunocompromised patients. C. albicans forms antifungal tolerant biofilms contributing significantly to therapeutic failure. The recently established haploid C. albicans biofilm model provides a new toolbox to uncover the mechanism governing the higher antifungal tolerance of biofilms. Here, we comprehensively examined the proteomics and antifungal susceptibility of standard diploid (SC5314 and BWP17) and stable haploid (GZY792 and GZY803) strains of C. albicans biofilms. Subsequent downstream analyses identified alkyl hydroperoxide reductase 1 (AHP1) as a critical determinant of C. albicans biofilm's tolerance of amphotericin B. At 32 μg/ml of amphotericin B, GZY803 haploid biofilms showed 0.1% of persister population as compared with 1% of the diploid biofilms. AHP1 expression was found to be lower in GZY803 biofilms, and AHP1 overexpression in GZY803 restored the percentage of persister population. Consistently, deleting AHP1 in the diploid strain BWP17 caused a similar increase in amphotericin B susceptibility. AHP1 expression was also positively correlated with the antioxidant potential. Furthermore, C. albicans ira2Δ/Δ biofilms were susceptible to amphotericin B and had a diminished antioxidant capacity. Interestingly, AHP1 overexpression in the ira2Δ/Δ strain restored the antioxidant potential and enhanced the persister population against amphotericin B, and shutting down the AHP1 expression in ira2Δ/Δ biofilms reversed the effect. In conclusion, we provide evidence that the AHP1 gene critically determines the amphotericin B tolerance of C. albicans biofilms possibly by maintaining the persisters' antioxidant capacity. This finding will open up new avenues for developing therapies targeting the persister population of C. albicans biofilms. The mass spectrometry proteomics data are available via ProteomeXchange with identifier PXD004274.

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Crossref · 10.1074/mcp.m116.061523

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  • Ahp1 can be directly or indirectly regulated by Ira2, an inhibitory regulator of the RAS-cAMP pathway.

    “Studies indicate that Ahp1 can be directly or indirectly regulated by Ira2, an inhibitory regulator of the RAS-cAMP pathway [70].”

    From Antifungal persistence: Clinical relevance and mechanisms (2025) · cites this paper as [70]

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Authors
Truong, T., Zeng, G., Qingsong, L., Kwang, L. T., Tong, C., Chan, F. Y., Wang, Y., & Seneviratne, C. J.
Affiliations
  • National University of Singapore (SG)
  • Agency for Science, Technology and Research (SG)
Corresponding author
  • Wang, Yue
  • Seneviratne, Chaminda Jayampath
Venue
Molecular & Cellular Proteomics
Publisher
Elsevier BV
Published
2016-11
Volume
15
Issue
11
Pages
3488-3500
ISSN
1535-9476 (ISSN-L)
OpenAlex
W2522661577
Cited by
45
References
57
Citations by year
2026: 1 · 2025: 5 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 8 · 2020: 3 · 2019: 9 · 2018: 5 · 2017: 3
FWCI
5.23
Type
journal article
Language
en
Open access
Locations
  • Molecular & Cellular Proteomics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Medical Research Council (R-221–000-073–511)
  • NUS-Start-up (R-221–000- 064–133)
  • Agency for Science, Technology, and Research
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
Keywords
Candida albicans, biofilm, antifungal tolerance, amphotericin B, alkyl hydroperoxide reductase, persister cells, antioxidant capacity, IRA2, ploidy, antifungal susceptibility, proteomics
MeSH terms
Amphotericin B, Antifungal Agents, Candida albicans, Diploidy, Fungal Proteins, Polyploidy, Down-Regulation, Gene Expression Regulation, Fungal, Biofilms, Drug Resistance, Bacterial, Proteomics, Peroxiredoxins

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