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Distinct phosphatase activity profiles in two strains of Trypanosoma cruzi
R Morales-Neto1, L Hulshof, C V Ferreira
1Departamento de Bioquímica, IB, UNICAMP, Campinas, SP, Brazil.
Abstract:
Phosphorylation of parasite proteins plays a key role in the process of cell invasion by Trypanosoma cruzi, the etiologic agent of Chagas' disease. In this sense, characterization of parasite kinases and phosphatases could open new possibilities for the rational design of chemotherapeutic agents for the treatment of Chagas' disease. In this work, we analyzed phosphatase activities in T. cruzi homogenates from 2 strains belonging to different lineages and with different resistance to oxidative stress. Tulahuen 2 cells (Lineage I) showed higher phosphatase activities and specificity constants when compared to the Y strain (Lineage II). Tulahuen 2 had an optimum phosphatase activity at pH 4.0 and the Y strain at pH 7.0. In both cases, neutral–basic, but not acid, phosphatase activities were increased in the presence of Mg2+. Although calcium had an inhibitory effect at a pH of 7.0 and 8.0 in the Y strain, this inhibition was restricted to pH 8.0 in the other strain. Different substrates and acid phosphotyrosine and alkaline phosphatase inhibitors exhibited distinct effects on the phosphatase activity of both strains. Our results provide a better understanding of T. cruzi phosphatases and reinforce the notion of heterogeneity among T. cruzi populations.
Insights
Investigating Trypanosoma cruzi phosphatases reveals significant differences between parasite strains, impacting potential drug development for Chagas' disease. Understanding these enzyme variations is crucial for targeted therapies.
Area of Science:
- Biochemistry
- Parasitology
- Molecular Biology
Background:
- Phosphorylation of Trypanosoma cruzi proteins is vital for host cell invasion.
- Characterizing parasite kinases and phosphatases may lead to novel chemotherapeutic agents for Chagas' disease.
Purpose of the Study:
- To analyze and compare phosphatase activities in two distinct strains of Trypanosoma cruzi.
- To investigate the biochemical properties and substrate specificities of T. cruzi phosphatases.
Main Methods:
- Comparative analysis of phosphatase activity in T. cruzi homogenates from Tulahuen 2 (Lineage I) and Y (Lineage II) strains.
- Assessing the effects of pH, Mg2+, Ca2+, various substrates, and specific inhibitors on phosphatase activity.
Main Results:
- Tulahuen 2 cells exhibited higher phosphatase activities and specificity constants than the Y strain.
- Optimal phosphatase activity occurred at pH 4.0 for Tulahuen 2 and pH 7.0 for the Y strain.
- Magnesium ions enhanced neutral-basic phosphatase activity, while calcium ions showed differential inhibitory effects based on pH and strain.
Conclusions:
- Significant heterogeneity exists in T. cruzi phosphatase activity between different lineages.
- These findings enhance the understanding of T. cruzi phosphatases and their potential as drug targets.
