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The moving junction of apicomplexan parasites: a key structure for invasion

Sébastien Besteiro1, Jean-François Dubremetz, Maryse Lebrun

  • 1UMR 5235 CNRS, DIMNP, Université de Montpellier 2,cc 107, 34095 Montpellier cedex 05, France. sebastien.besterio@univmontp2.fr

Cellular Microbiology
|May 4, 2011
PubMed

Insights

Apicomplexan parasites invade host cells using a moving junction (MJ) complex. This structure, built by secreted proteins like AMA1 and RON2, is crucial for parasite entry and survival.

Area of Science:

  • Parasitology
  • Cell Biology
  • Molecular Biology

Background:

  • Apicomplexa are obligate intracellular parasites causing significant human and animal diseases.
  • Successful host cell invasion by Apicomplexa requires parasite motility and stable host cell attachment.
  • The moving junction (MJ) complex is essential for parasite internalization into a parasitophorous vacuole.

Purpose of the Study:

  • To elucidate the cooperative role of secreted parasitic proteins in forming the moving junction (MJ).
  • To understand the molecular mechanisms driving Apicomplexan cell invasion.
  • To refine the emerging model of MJ complex formation and function.

Main Methods:

  • Analysis of recent data from Plasmodium and Toxoplasma studies.
  • Characterization of secreted microneme protein AMA1 and rhoptry neck protein RON2.
  • Investigating the molecular organization and interactions within the MJ complex.

Main Results:

  • An emerging model highlights the cooperative function of secreted proteins in MJ assembly.
  • AMA1 is exported to the parasite surface, while RON2 is inserted into the host cell membrane as a receptor.
  • Other RON proteins also participate in the MJ complex formation.

Conclusions:

  • The MJ complex is a cooperative structure built by secreted Apicomplexan proteins.
  • AMA1 and RON proteins play critical roles in mediating parasite invasion and anchorage.
  • Further research is needed to fully characterize MJ molecular organization and host-parasite interactions.

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