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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
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.
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.
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