Experimental Genetics of Plasmodium berghei NFU in the Apicoplast Iron-Sulfur Cluster Biogenesis Pathway

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Joana M Haussig1, Kai Matuschewski, Taco W A Kooij

  • 1Parasitology Unit, Max Planck Institute for Infection Biology, Berlin, Germany.

Plos One
|June 28, 2013
PubMed

Insights

The apicoplast nitrogen fixation factor U (NifU)-like domain containing protein (NFUapi) in malaria parasites has redundant or non-essential roles. NFUapi aids in blood-stage infection establishment and apicoplast morphology, but is not essential for parasite survival.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Biochemistry

Background:

  • Apicomplexa possess an apicoplast, a non-photosynthetic organelle crucial for parasite survival.
  • Iron-sulfur [Fe-S] cluster proteins within the apicoplast are vital for essential biosynthetic pathways, including isoprenoid and lipoic acid generation.

Purpose of the Study:

  • To investigate the function of the apicoplast [Fe-S] cluster biosynthesis pathway component, NFUapi, in Plasmodium berghei.
  • To determine the essentiality and role of NFUapi in the parasite's life cycle and apicoplast function.

Main Methods:

  • Experimental genetics was employed to ablate the NFUapi gene in Plasmodium berghei.
  • NFUapi was tagged with fluorescent proteins to visualize the apicoplast and assess drug-induced morphological changes.

Main Results:

  • Ablation of NFUapi did not prevent parasite survival or completion of the life cycle, suggesting redundant or non-essential functions.
  • NFUapi-deficient parasites showed reduced merosome formation, indicating an auxiliary role in blood-stage infection.
  • Azithromycin abolished the apicoplast signal, while fosmidomycin had no observable effect on apicoplast morphology.

Conclusions:

  • NFUapi plays a specialized or redundant role in the apicoplast [Fe-S] cluster biosynthesis pathway in malaria parasites.
  • The findings provide insights into the complex metabolic pathways and potential drug targets within the apicoplast.

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