CYP51 structures and structure-based development of novel, pathogen-specific inhibitory scaffolds
Tatiana Y Hargrove1, Kwangho Kim, Maria de Nazaré Correia Soeiro
1Department of Biochemistry, School of Medicine, Vanderbilt University, Nashville, TN, USA.
Summary
Researchers identified novel VNI scaffolds targeting sterol 14α-demethylase (CYP51) in protozoa. These potent, non-toxic inhibitors show promise for treating parasitic infections like Chagas disease.
Area of Science:
- Biochemistry
- Medicinal Chemistry
- Parasitology
Background:
- Sterol 14α-demethylase (CYP51) is crucial for sterol biosynthesis and a key target for antifungal azoles.
- Existing azoles are based on ketoconazole and fluconazole scaffolds, selected for antiparasitic activity.
- Protozoan pathogens like Trypanosoma and Leishmania rely on CYP51 for survival.
Purpose of the Study:
- To identify novel, protozoa-specific inhibitors of CYP51.
- To evaluate the antiprotozoan activity and toxicity of newly identified scaffolds.
- To elucidate the structural basis for CYP51 inhibition and guide further drug development.
Main Methods:
- Direct inhibition assays of CYP51 activity across various protozoan species.
- Synthesis and characterization of novel inhibitory scaffolds, including the VNI scaffold.
- Acute toxicity studies in a mouse model.
- X-ray crystallography of Trypanosomatidae CYP51 in ligand-free and complexed states.
Main Results:
- Three novel protozoa-specific CYP51 inhibitory scaffolds were identified, with potency correlating to antiprotozoan activity.
- The VNI scaffold demonstrated potent activity against Trypanosoma cruzi amastigotes at nanomolar concentrations and showed no toxicity in mice.
- Crystal structures revealed a rigid CYP51 active site, providing insights into inhibitor binding and specificity.
Conclusions:
- The VNI scaffold is a promising lead for developing novel, pathogen-specific antiparasitic agents targeting CYP51.
- Structure-based rational design of CYP51 inhibitors offers a highly promising strategy for combating protozoan infections.
- Further optimization of the VNI scaffold is warranted based on structural and biological data.
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