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Cell wall alpha-1,3-glucan is required to anchor the Cryptococcus neoformans capsule.
Amy J Reese1, Tamara L Doering
1Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 South Euclid Avenue, St Louis, MO 63110-1093, USA.
Molecular Microbiology
|November 19, 2003
Summary
Cryptococcus neoformans uses alpha-1,3-glucan to attach its capsule. Inhibiting this component with RNA interference creates acapsular, slow-growing fungi, suggesting a new antifungal strategy.
Area of Science:
- Mycology
- Immunology
- Molecular Biology
Background:
- Cryptococcus neoformans is an opportunistic fungal pathogen causing severe human diseases.
- Its virulence is critically dependent on a polysaccharide capsule that hinders the host immune response.
Purpose of the Study:
- To investigate the mechanism of capsule attachment to the Cryptococcus neoformans cell.
- To explore the potential of targeting alpha-1,3-glucan for antifungal therapy.
Main Methods:
- Utilized double-stranded RNA interference to post-transcriptionally inhibit alpha-1,3-glucan synthase expression.
- Analyzed the effect of inhibition on capsule assembly and fungal growth.
Main Results:
- Inhibition of alpha-1,3-glucan synthase prevented capsule association with the cell, despite polysaccharide production.
- Resulting acapsular Cryptococcus neoformans strains exhibited slower growth.
- Demonstrated a novel mechanism for polysaccharide attachment to the fungal cell wall.
Conclusions:
- Alpha-1,3-glucan is essential for cryptococcal capsule assembly.
- RNA interference targeting alpha-1,3-glucan synthase offers a potential strategy for developing new antifungal treatments by eliminating the capsule.