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Updated: May 24, 2026
Defining Substrate Specificities for Lipase and Phospholipase Candidates
Published on: November 23, 2016
Negative correlation between phospholipase and esterase activity produced by Fusarium isolates
K Ishida1, D S Alviano, B G Silva
1Laboratório de Biologia Celular de Fungos, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brasil.
Abstract:
Fusarium species have emerged as one of the more outstanding groups of clinically important filamentous fungi, causing localized and life-threatening invasive infections with high morbidity and mortality. The ability to produce different types of hydrolytic enzymes is thought to be an important virulence mechanism of fungal pathogens and could be associated with the environment of the microorganism. Here, we have measured the production of two distinct lipolytic enzymes, phospholipase and esterase, by sixteen Fusarium isolates recovered from the hospital environment, immunocompromised patients' blood cultures, foot interdigital space scrapings from immunocompromised patients, and foot interdigital space scrapings from immunocompetent patients (4 isolates each). Fourteen of these 16 isolates were identified as Fusarium solani species complex (FSSC) and two were identified as F. oxysporum species complex (FOSC). Some relevant genus characteristics were visualized by light and electron microscopy such as curved and multicelled macroconidia with 3 or 4 septa, microconidia, phialides, and abundant chlamydospores. All Fusarium isolates were able to produce esterase and phospholipase under the experimental conditions. However, a negative correlation was observed between these two enzymes, indicating that a Fusarium isolate with high phospholipase activity has low esterase activity and vice versa. In addition, Fusarium isolated from clinical material produced more phospholipases, while environmental strains produced more esterases. These observations may be correlated with the different types of substrates that these fungi need to degrade during their nutrition processes.
Insights
This study reveals that Fusarium fungi produce both esterase and phospholipase enzymes. Clinical Fusarium isolates showed higher phospholipase activity, while environmental strains produced more esterase, suggesting distinct roles in virulence and nutrition.
Area of Science:
- Medical Mycology
- Fungal Pathogenesis
- Enzymology
Background:
- Fusarium species are significant fungal pathogens causing severe infections.
- Hydrolytic enzyme production is a key virulence factor in fungi.
- Lipolytic enzymes like phospholipase and esterase are crucial for fungal survival and infection.
Purpose of the Study:
- To quantify esterase and phospholipase production in Fusarium isolates from diverse sources.
- To investigate the relationship between enzyme activity and the origin of Fusarium isolates (clinical vs. environmental).
- To explore the potential role of these enzymes in Fusarium virulence and nutrient acquisition.
Main Methods:
- Sixteen Fusarium isolates were collected from hospital environments and patient samples.
- Enzyme assays were performed to measure phospholipase and esterase activity.
- Isolates were identified using microscopy and potentially molecular methods (implied).
Main Results:
- All 16 Fusarium isolates produced both esterase and phospholipase.
- A negative correlation was observed: high phospholipase activity correlated with low esterase activity, and vice versa.
- Fusarium from clinical sources exhibited higher phospholipase production, while environmental strains showed greater esterase production.
Conclusions:
- Fusarium species possess both esterase and phospholipase activities.
- Enzyme production profiles differ between clinical and environmental isolates.
- These lipolytic enzymes likely play distinct roles in Fusarium's adaptation, nutrition, and pathogenesis.
