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Trypanosoma cruzi: identification of proteinases in shed components of trypomastigote forms
J K Yokoyama-Yasunaka1, E M Pral, O C Oliveira Júnior
1Departamento de Parasitologia, Universidade de São Paulo, Brazil.
Abstract:
Trypanosoma cruzi trypomastigotes were shown to predominantly release high molecular weight components (above 50 kDa) when allowed to shed for 1 hour in protein-free media. Under these conditions, parasites were not damaged or lysed, as was indicated by: (a) their normal mobility; (b) their retaining of some of the labelled proteins; (c) the unchanged pattern of biotinylated surface proteins after shedding. Shed components were shown to display proteinase activities, detected at 97 and 50/60 kDa in gelatin gels. These proteolytic activities were completely inhibited by E-64, indicating that they were due to cysteine proteinases.
Insights
Trypanosoma cruzi trypomastigotes shed high molecular weight proteins (>50 kDa) without cell damage. These released components exhibit cysteine proteinase activity, crucial for understanding parasite biology.
Area of Science:
- Parasitology
- Molecular Biology
- Biochemistry
Background:
- Trypanosoma cruzi is the causative agent of Chagas disease.
- Understanding parasite-host interactions is key to developing treatments.
- Extracellular components released by parasites can play significant roles in infection.
Purpose of the Study:
- To characterize the high molecular weight components shed by Trypanosoma cruzi trypomastigotes.
- To investigate the enzymatic activities of these shed components.
- To determine the nature of the proteinases involved.
Main Methods:
- Culturing Trypanosoma cruzi trypomastigotes in protein-free media.
- Analyzing shed components using gel electrophoresis and protein labeling.
- Assessing parasite viability through mobility and protein retention.
- Detecting proteinase activity using gelatin zymography.
- Inhibiting proteinase activity with E-64.
Main Results:
- Trypanosoma cruzi trypomastigotes predominantly shed high molecular weight components (>50 kDa) within 1 hour.
- Parasites remained viable, showing normal motility and retaining surface proteins.
- Shed components displayed proteinase activities at 97 and 50/60 kDa.
- These proteolytic activities were identified as cysteine proteinases due to E-64 inhibition.
Conclusions:
- Trypanosoma cruzi trypomastigotes actively release functional high molecular weight proteins.
- The shed components possess cysteine proteinase activity, suggesting a role in parasite virulence or host interaction.
- These findings provide insights into the extracellular secretome of Trypanosoma cruzi.