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Biochemical characterization of potential virulence markers in the human fungal pathogen Pseudallescheria boydii
André L S Santos1, Vera C B Bittencourt, Marcia R Pinto
1Laboratorio de Estudos Integrados em Bioquimica Microbiana, Departamento de Microbiologia Geral/IMPPG, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Ilha do Fundão, Rio de Janeiro, RJ, Brazil.
Abstract:
The ubiquitous Pseudallescheria boydii (anamorph Scedosporium apiospermum) is a saprophytic filamentous fungus recognized as a potent etiologic agent of a wide variety of infections in immunocompromised as well as in immunocompetent patients. Very little is known about the virulence factors expressed by this fungal pathogen. The present review provides an overview of recent discoveries related to the identification and biochemical characterization of potential virulence attributes produced by P. boydii, with special emphasis on surface and released molecules. These structures include polysaccharides (glucans), glycopeptides (peptidorhamnomannans), glycolipids (glucosylceramides) and hydrolytic enzymes (proteases, phosphatases and superoxide dismutase), which have been implicated in some fundamental cellular processes in P. boydii including growth, differentiation and interaction with host molecules. Elucidation of the structure of cell surface components as well as the secreted molecules, especially those that function as virulence determinants, is of great relevance to understand the pathogenic mechanisms of P. boydii.
Insights
Pseudallescheria boydii is a fungus causing infections. This review details its virulence factors, including surface molecules and enzymes, crucial for understanding its pathogenicity.
Area of Science:
- Medical Mycology
- Molecular Pathogenesis
Background:
- Pseudallescheria boydii (anamorph Scedosporium apiospermum) is a ubiquitous fungus.
- It causes diverse infections in both immunocompromised and immunocompetent individuals.
- Knowledge regarding its virulence factors remains limited.
Purpose of the Study:
- To review recent findings on the identification and biochemical characterization of potential virulence factors of P. boydii.
- To emphasize surface and secreted molecules involved in fungal pathogenesis.
- To enhance understanding of P. boydii pathogenic mechanisms.
Main Methods:
- Literature review of recent discoveries.
- Identification and biochemical characterization of P. boydii molecules.
- Analysis of the role of these molecules in fungal processes and host interactions.
Main Results:
- Identified potential virulence attributes including polysaccharides (glucans), glycopeptides (peptidorhamnomannans), and glycolipids (glucosylceramides).
- Highlighted the role of hydrolytic enzymes such as proteases, phosphatases, and superoxide dismutase.
- These molecules are implicated in P. boydii growth, differentiation, and host molecule interaction.
Conclusions:
- Surface and secreted molecules are key to P. boydii pathogenicity.
- Further elucidation of these virulence determinants is essential for understanding infection mechanisms.
- This knowledge can inform strategies to combat P. boydii infections.
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