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N-acetylglucosamine affects Cryptococcus neoformans cell-wall composition and melanin architecture
Emma Camacho1, Christine Chrissian2,3, Radames J B Cordero1
1Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA.
Microbiology (Reading, England)
|October 19, 2017
Summary
Supplementing the fungus Cryptococcus neoformans with N-acetylglucosamine (GlcNAc) alters its cell wall and increases melanin. This finding offers insights into fungal virulence and potential metabolic tracking applications.
Area of Science:
- Mycology
- Biochemistry
- Cell Biology
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen.
- Melanin and the polysaccharide capsule are key virulence factors.
- The fungal cell wall is crucial for viability and stress resistance.
Purpose of the Study:
- To investigate the impact of N-acetylglucosamine (GlcNAc) on C. neoformans cell-wall composition and melanin production.
- To determine if GlcNAc can be metabolized by C. neoformans.
- To explore GlcNAc's role in fungal cell wall architecture and virulence factor assembly.
Main Methods:
- Culturing C. neoformans with GlcNAc as a sole carbon and nitrogen source.
- Supplementing cultures with isotopically 15N-labeled GlcNAc.
- Analyzing cell-wall composition, thickness, capsule size, and melanin deposition using advanced techniques.
Main Results:
- C. neoformans metabolizes GlcNAc, incorporating it into chitin/chitosan cell wall components.
- GlcNAc supplementation alters cell-wall thickness, chitosan content, and capsule size.
- Increased melanin deposition and assembly were observed in GlcNAc-treated cells.
Conclusions:
- GlcNAc supplementation has pleiotropic effects on C. neoformans cell-wall and melanin.
- GlcNAc influences fungal cell-wall architecture, impacting virulence factor assembly.
- This highlights GlcNAc's potential for metabolic tracking in fungi.