Fatty Acid Synthesis Is Essential for Survival of Cryptococcus neoformans and a Potential Fungicidal Target
Open accessAbstract
Fatty acid synthase in the yeast Cryptococcus neoformans is composed of two subunits encoded by FAS1 and FAS2 genes. We inserted a copper-regulated promoter (P(CTR4-2)) to regulate FAS1 and FAS2 expression in Cryptococcus neoformans (strains P(CTR4-2)/FAS1 and P(CTR4-2)/FAS2, respectively). Both mutants showed growth rates similar to those of the wild type in a low-copper medium in which FAS1 and FAS2 were expressed, but even in the presence of exogenous fatty acids, strains were suppressed in growth under high-copper conditions. The treatment of C. neoformans with fluconazole was shown to have an increased inhibitory activity and even became fungicidal when either FAS1 or FAS2 expression was suppressed. Furthermore, a subinhibitory dose of fluconazole showed anticryptococcal activity in vitro in the presence of cerulenin, a fatty acid synthase inhibitor. In a murine model of pulmonary cryptococcosis, a tissue census of yeast cells in P(CTR4-2)/FAS2 strain at day 7 of infection was significantly lower than that in mice treated with tetrathiomolybdate, a copper chelator (P < 0.05), and a yeast census of P(CTR4-2)/FAS1 strain at day 14 of infection in the brain was lower in the presence of more copper. In fact, no positive cultures from the brain were detected in mice (with or without tetrathiomolybdate treatment) infected with the P(CTR4-2)/FAS2 strain, which implies that this mutant did not reach the brain in mice. We conclude that both FAS1 and FAS2 in C. neoformans are essential for in vitro and in vivo growth in conditions with and without exogenous fatty acids and that FAS1 and FAS2 can potentially be fungicidal targets for C. neoformans with a potential for synergistic behavior with azoles.
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The copper-suppressible promoter CTR4-2 has been used previously to study function of the essential genes FAS1 and FAS2 in vivo.
“the copper-suppressible promoter CTR4-2, which has been used previously to study function of the essential genes FAS1 and FAS2 in vivo (Chayakulkeeree et al. 2007).”
From Genetic analysis of Hsp90 function in <i>Cryptococcus neoformans</i> highlights key roles in stress tolerance and virulence (2022) · cites this paper as Chayakulkeeree et al. 2007
The copper suppressive promoter CTR4-2 has been employed to study essential gene functions both in vitro and in vivo.
“The copper suppressive promoter CTR4-2 has been employed to study essential gene functions both in vitro and in vivo, and thus was selected to regulate HSP90 expression in this study (Chayakulkeeree et al. 2007).”
From Genetic analysis of Hsp90 function in <i>Cryptococcus neoformans</i> highlights key roles in stress tolerance and virulence (2022) · cites this paper as Chayakulkeeree et al. 2007
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- Authors
- Chayakulkeeree, M., Rude, T. H., Toffaletti, D. L., & Perfect, J. R.
- Affiliations
- Siriraj Hospital (TH)
- Department of Medicine
- Duke Medical Center (US)
- Corresponding author
- Perfect, John R.
- Venue
- Antimicrobial Agents and Chemotherapy
- Publisher
- American Society for Microbiology
- Published
- 2007-10
- Volume
- 51
- Issue
- 10
- Pages
- 3537-3545
- ISSN
- 0066-4804 (ISSN-L)
- 1098-6596
- PMC
- PMC2043279
- OpenAlex
- W2068379265
- Cited by
- 56
- References
- 24
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 4 · 2023: 2 · 2022: 6 · 2021: 5 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 1 · 2013: 2 · 2012: 6
- FWCI
- 2.07
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Antimicrobial Agents and Chemotherapy (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Allergy and Infectious Diseases (R56AI028388, AI28388, R01AI028388)
- Topics
- Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
- Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
- Keywords
- Cryptococcus neoformans, fatty acid synthase, FAS1, FAS2, copper regulation, copper chelation, tetrathiomolybdate, fluconazole, cerulenin, cryptococcosis, antifungal synergy, azoles, yeast growth
- MeSH terms
- Animals, Antifungal Agents, Azoles, Brain, Cerulenin, Copper, Cryptococcosis, Cryptococcus neoformans, DNA, Fungal, Drug Synergism, Enzyme Inhibitors, Fatty Acids, Isoenzymes, Lung, Microbial Sensitivity Tests, Phenotype, Promoter Regions, Genetic, Colony Count, Microbial, Reverse Transcriptase Polymerase Chain Reaction, Mice, Fatty Acid Synthases
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