Calcium Uptake and Proton Transport by Acidocalcisomes of Toxoplasma gondii
Author Information
Author(s): Rohloff Peter, Miranda Kildare, Rodrigues Juliany C. F., Fang Jianmin, Galizzi Melina, Plattner Helmut, Hentschel Joachim, Moreno Silvia N. J.
Primary Institution: Department of Cellular Biology and Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
Hypothesis
The study aims to purify and characterize acidocalcisomes from Toxoplasma gondii to understand their function in calcium uptake and proton transport.
Conclusion
The refined method for isolating acidocalcisomes from T. gondii allows for the demonstration of ATP- and PPi-mediated proton uptake activities, confirming the presence of a Ca2+/H+-ATPase.
Supporting Evidence
- Acidocalcisomes are acidic organelles rich in calcium and other cations.
- The study provides a refined method for isolating acidocalcisomes that results in higher purity and quantity for analysis.
- ATP- and PPi-mediated proton uptake activities were demonstrated for the first time in isolated acidocalcisomes.
- The presence of Ca2+/H+ and Na+/H+ exchange systems was confirmed in the acidocalcisomes.
Takeaway
The researchers found a better way to isolate special structures in Toxoplasma gondii that help the parasite manage calcium and acid levels, which is important for its survival.
Methodology
The study used a modified protocol for the purification of acidocalcisomes from T. gondii tachyzoites, involving subcellular fractionation and discontinuous iodixanol gradient purification.
Limitations
The study acknowledges that some organelles may lose functionality during the isolation process, which could affect the results.
Digital Object Identifier (DOI)
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