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Purification and properties of an acid phosphatase from Entamoeba histolytica HM-1:IMSS
M M Aguirre-García1, J Cerbón, P Talamás-Rohana
1Experimental Pathology Department, Center for Research and Advanced Studies, IPN, México.
Abstract:
Entamoeba histolytica contains and secretes acid phosphatase, which has been proposed as a virulence factor in some pathogenic microorganisms. In this work, we purified and characterised a membrane-bound acid phosphatase (MAP) from E. histolytica HM-1:IMSS and studied the effect of different chemical compounds on the secreted acid phosphatase and MAP activities. MAP purification was accomplished by detergent solubilisation, and affinity and ion exchange chromatographies. The enzyme showed a pI of 5.5-6.2, an optimum pH of 5.5, and a Km value of 1.14 mM with p-nitrophenyl phosphate.
Insights
This study purified and characterized membrane-bound acid phosphatase (MAP) from Entamoeba histolytica, revealing its biochemical properties and response to chemical compounds, which could inform parasite virulence factor research.
Area of Science:
- Biochemistry
- Parasitology
- Molecular Biology
Background:
- Entamoeba histolytica is a pathogen where acid phosphatase is a potential virulence factor.
- Understanding parasitic enzymes is crucial for developing targeted therapies.
Purpose of the Study:
- To purify and characterize a membrane-bound acid phosphatase (MAP) from E. histolytica.
- To investigate the effects of various chemical compounds on both secreted and membrane-bound acid phosphatase activities.
Main Methods:
- Purification of MAP using detergent solubilization, affinity chromatography, and ion exchange chromatography.
- Biochemical characterization including determination of isoelectric point (pI), optimal pH, and Michaelis constant (Km).
Main Results:
- Successfully purified MAP from E. histolytica HM-1:IMSS.
- The enzyme exhibited a pI of 5.5-6.2, an optimal pH of 5.5, and a Km of 1.14 mM for p-nitrophenyl phosphate.
- The study also assessed the impact of different chemical compounds on enzyme activity.
Conclusions:
- The characterized MAP from E. histolytica possesses specific biochemical properties.
- Further investigation into MAP and secreted acid phosphatase activities could elucidate their roles in E. histolytica pathogenesis.