Biomolecules (Apr 2021)

Chemoinformatics Studies on a Series of Imidazoles as Cruzain Inhibitors

  • Alex R. Medeiros,
  • Leonardo L. G. Ferreira,
  • Mariana L. de Souza,
  • Celso de Oliveira Rezende Junior,
  • Rocío Marisol Espinoza-Chávez,
  • Luiz Carlos Dias,
  • Adriano D. Andricopulo

DOI
https://doi.org/10.3390/biom11040579
Journal volume & issue
Vol. 11, no. 4
p. 579

Abstract

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Natural products based on imidazole scaffolds have inspired the discovery of a wide variety of bioactive compounds. Herein, a series of imidazoles that act as competitive and potent cruzain inhibitors was investigated using a combination of ligand- and structure-based drug design strategies. Quantitative structure–activity relationships (QSARs) were generated along with the investigation of enzyme–inhibitor molecular interactions. Predictive hologram QSAR (HQSAR, r2pred = 0.80) and AutoQSAR (q2 = 0.90) models were built, and key structural properties that underpin cruzain inhibition were identified. Moreover, comparative molecular field analysis (CoMFA, r2pred = 0.81) and comparative molecular similarity indices analysis (CoMSIA, r2pred = 0.73) revealed 3D molecular features that strongly affect the activity of the inhibitors. These findings were examined along with molecular docking studies and were highly compatible with the intermolecular contacts that take place between cruzain and the inhibitors. The results gathered herein revealed the main factors that determine the activity of the imidazoles studied and provide novel knowledge for the design of improved cruzain inhibitors.

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