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Crystal structure of Plasmodium falciparum proplasmepsin IV: the plasticity of proplasmepsins

Rosario Recacha1, Kristaps Jaudzems1, Inara Akopjana2

  • 1Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, LV-1006, Latvia.

Acta Crystallographica. Section F, Structural Biology Communications
|September 8, 2016
PubMed

Insights

The crystal structure of Plasmodium falciparum plasmepsin IV zymogen (pPM IV) was determined. This finding offers insights into antimalarial drug development by revealing similarities and differences in plasmepsin activation mechanisms.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Parasitology

Background:

  • Plasmepsin IV (PM IV) from Plasmodium falciparum is a key target for novel antimalarial drug discovery.
  • Understanding the structure of PM IV zymogen is crucial for elucidating its activation pathway.

Purpose of the Study:

  • To determine the crystal structure of the truncated zymogen of Plasmepsin IV (pPM IV).
  • To compare the structure of pPM IV with other known proplasmepsins to understand inactivation-activation mechanisms.

Main Methods:

  • X-ray crystallography was used to determine the structure of pPM IV at 1.5 Å resolution.
  • Comparative structural analysis was performed with other proplasmepsin structures.

Main Results:

  • The crystal structure of pPM IV, comprising the mature enzyme and a 47-residue prosegment, was successfully determined.
  • pPM IV shares structural similarities with proplasmepsin IV from P. vivax (pPvPM) and other P. falciparum proplasmepsins.
  • Structural comparison revealed insights into the distinct inactivation-activation mechanisms of plasmepsin zymogens.

Conclusions:

  • The determined structure of pPM IV provides a foundation for rational drug design targeting malaria.
  • Understanding structural variations among plasmepsins can guide the development of more effective and specific antimalarial agents.
Keywords:
Plasmodium falciparumaspartic protease zymogenmalariaproplasmepsin IV

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