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Calcium storage and function in apicomplexan parasites.

Silvia N J Moreno1, Lawrence Ayong, Douglas A Pace

  • 1Center for Tropical and Emerging Global Diseases and Department of Cellular Biology, University of Georgia, Athens, GA 30602, USA. smoreno@cb.uga.edu

Essays in Biochemistry
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PubMed
Summary
This summary is machine-generated.

Calcium signaling is crucial for apicomplexan parasite functions like invasion and motility. Understanding these unique calcium pathways could reveal new therapeutic targets for diseases caused by these organisms.

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Area of Science:

  • Parasitology
  • Cell Biology
  • Biochemistry

Background:

  • Calcium ions (Ca²⁺) are vital for essential functions in apicomplexan parasites, including host cell invasion, motility, and differentiation.
  • Major calcium stores identified include the endoplasmic reticulum (ER) and acidocalcisomes, with other organelles like the Golgi, mitochondrion, apicoplast, and vacuole also implicated.
  • Apicomplexan parasites possess a limited set of calcium-related genes compared to other eukaryotes, many of which are uncharacterized.

Purpose of the Study:

  • To review and synthesize the current understanding of calcium storage, signaling, and function in apicomplexan parasites.
  • To highlight the unique aspects of calcium-mediated pathways in these organisms.
  • To underscore the potential for identifying novel therapeutic targets through functional characterization of calcium-related genes.

Main Methods:

  • Literature review and analysis of existing genomic and experimental data on calcium-related genes and pathways in apicomplexans.
  • Comparison of calcium-related gene repertoires across different apicomplexan species.
  • Examination of experimental evidence for calcium signaling mechanisms, including IP3-dependent responses and calcium-binding proteins.

Main Results:

  • Several Ca²⁺-ATPases are described, and IP3-dependent calcium responses are observed in Plasmodium spp. and T. gondii, though IP3 or ryanodine receptors are absent.
  • Calcium channel genes are present in T. gondii but not in Plasmodium spp. and Cryptosporidium spp.
  • Effector calcium-binding proteins, such as calmodulins and calcium-dependent protein kinases (CDPKs), are present, with characterized CDPKs playing key roles in invasion and differentiation.

Conclusions:

  • Fragmented information suggests unique calcium-mediated pathways exist in apicomplexan parasites.
  • Functional characterization of apicomplexan calcium-related genes is crucial for understanding parasite biology.
  • Identifying novel therapeutic targets for apicomplexan infections is a potential outcome of this research.