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Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation
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Versatile Imidazole Scaffold with Potent Activity against Multiple Apicomplexan Parasites.

Monique Khim1,2, Jemma Montgomery3, Mariana Laureano De Souza4

  • 1Seattle Structural Genomics Center for Infectious Disease, Seattle, Washington 98109, United States.

ACS Infectious Diseases
|May 8, 2025
PubMed
Summary

New imidazole drugs show promise against apicomplexan parasites like those causing malaria and toxoplasmosis. These compounds target conserved kinases, offering a potential new strategy for drug development against resistant infections.

Keywords:
PlasmodiumToxoplasmaapicomplexadrugskinase

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Area of Science:

  • Parasitology
  • Drug Discovery
  • Molecular Biology

Background:

  • Apicomplexan parasites (Plasmodium, Toxoplasma, Cryptosporidium) cause significant global health issues.
  • Current therapies for these parasitic infections are often inadequate, ineffective, or facing drug resistance.
  • Innovative and resource-efficient strategies are crucial for developing new anti-parasitic drugs.

Purpose of the Study:

  • To investigate the cellular targets and effects of two Plasmodium falciparum inhibitors in Toxoplasma gondii and Cryptosporidium parvum.
  • To leverage conserved kinomes for identifying novel drug targets and therapeutic strategies against apicomplexan parasites.
  • To evaluate the potential of imidazole-based compounds as lead candidates for new anti-parasitic drugs.

Main Methods:

  • Utilized structural and modeling approaches to analyze the stereospecific binding of imidazole inhibitors (R)-RY-1-165 and (R)-RY-1-185.
  • Employed enzymatic assays and engineered mutant Plasmodium falciparum strains to identify cellular targets beyond PfPKG.
  • Investigated drug activity in T. gondii and C. parvum using mutant parasites, enzyme assays, and molecular modeling.

Main Results:

  • The imidazole compounds bind stereospecifically to Plasmodium falciparum cGMP-dependent protein kinase (PfPKG) and related kinases.
  • Cellular activity is mediated by targets additional to PfPKG, including Plasmodium falciparum calcium-dependent protein kinases (PfCDPK-1, -4).
  • The compounds are active against T. gondii and C. parvum, with T. gondii tachyzoites showing particular sensitivity to TgPKG, TgCDPK1, TgCDPK4, and MAPKL-1.

Conclusions:

  • The tested imidazole scaffold demonstrates broad-spectrum activity against key apicomplexan parasites.
  • Identified multiple kinase targets, including TgPKG, TgCDPK1, TgCDPK4, and MAPKL-1 in T. gondii, offering diverse therapeutic avenues.
  • This research suggests the imidazole scaffold holds significant promise for the development of novel drugs against toxoplasmosis and related diseases.