Candida proteinases and candidosis.

Area of Science:

• Medical Mycology
• Microbial Pathogenesis
• Enzymology

Background:

• Opportunistic yeast infections, particularly Candida albicans, are a growing global health concern.
• Superficial candidiasis (e.g., vaginitis) is common and often treatment-resistant.
• Systemic candidosis poses a significant risk in immunocompromised patients and those undergoing invasive medical procedures.

Purpose of the Study:

• To review the properties of extracellular acid proteinases secreted by Candida albicans.
• To discuss the role of these proteinases as virulence factors in Candida infections.
• To explore potential diagnostic and therapeutic applications based on proteinase activity.

Main Methods:

• Purification and characterization of two secretory proteinases from Candida albicans.
• Review of existing literature on Candida proteinases and their enzymatic activities.
• Analysis of proteinase substrate specificities, including secretory IgA, keratin, and collagen.

Main Results:

• Candida albicans secretes extracellular acid proteinases, a virulence factor also found in Candida tropicalis and Candida parapsilosis.
• These enzymes are carboxyl proteinases capable of degrading secretory IgA.
• Some proteinases exhibit keratinolytic and collagenolytic activities, contributing to tissue invasion.

Conclusions:

• Candida secretory proteinases are significant virulence factors contributing to the pathogenesis of candidiasis.
• Understanding these enzymes offers potential for developing novel diagnostic markers and therapeutic interventions for Candida infections.
• Targeting proteinase activity could represent a strategy to combat both superficial and systemic candidiasis.