Reactivity versus steric effects in fluorinated ketones as esterase inhibitors: A quantum mechanical and molecular dynamics study

Josep Rayo, Lourdes Muñoz, Gloria Rosell, Bruce D. Hammock, Angel Guerrero, F. Javier Luque, Ramon Pouplana

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Carboxylesterases (CEs) are a family of ubiquitous enzymes with broad substrate specificity, and their inhibition may have important implications in pharmaceutical and agrochemical fields. One of the most potent inhibitors both for mammalian and insect CEs are trifluoromethyl ketones (TFMKs), but the mechanism of action of these chemicals is not completely understood. This study examines the balance between reactivity versus steric effects in modulating the activity against human carboxylesterase 1. The intrinsic reactivity of the ketone moiety is determined from quantum mechanical computations, which combine gas phase B3LYP calculations with hydration free energies estimated with the IEF/MST model. In addition, docking and molecular dynamics simulations are used to explore the binding mode of the inhibitors along the deep gorge that delineates the binding site. The results point out that the activity largely depends on the nature of the fluorinated ketone, since the activity is modulated by the balance between the intrinsic electrophilicity of the carbonyl carbon atom and the ratio between keto and hydrate forms. However, the results also suggest that the correct alignment of the alkyl chain in the binding site can exert a large influence on the inhibitory activity, as this effect seems to override the intrinsic reactivity features of the fluorinated ketone. Overall, the results sustain a subtle balance between reactivity and steric effects in modulating the inhibitory activity of TFMK inhibitors.

Original languageEnglish (US)
Pages (from-to)1753-1764
Number of pages12
JournalJournal of Molecular Modeling
Volume16
Issue number11
DOIs
StatePublished - Nov 2010

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Keywords

  • Esterase
  • Fluorinated ketones
  • Molecular dynamics
  • Quantum mechanical computations
  • Structure-based drug design

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Computer Science Applications
  • Computational Theory and Mathematics
  • Catalysis
  • Organic Chemistry
  • Inorganic Chemistry

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