The synthesis and kinetic evaluation of aryl α-aminophosphonates as novel inhibitors of T. cruzi trans-sialidase

Zexin Chen, Patricia Marce Villa, Ricardo Resende, Pedro M. Alzari, A. Carlos Frasch, Johannes Van Den Elsen, Susan Crennell, Andrew Watts

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The trans-sialidase protein expressed by Trypanosoma cruzi is an important enzyme in the life cycle of this human pathogenic parasite and is considered a promising target for the development of new drug treatments against Chagas' disease. Here we describe α-amino phosphonates as a novel class of inhibitor of T. cruzi trans-sialidase. Molecular modelling studies were initially used to predict the active-site binding affinities for a series of amino phosphonates, which were subsequently synthesised and their IC 50s determined in vitro. The measured inhibitory activities show some correlation with the predictions from molecular modelling, with 1-napthyl derivatives found to be the most potent inhibitors having IC 50s in the low micromolar range. Interestingly, kinetic analysis of the mode of inhibition demonstrated that the α-aminophosphonates tested here operate in a non-competitive manner.

Original languageEnglish
Pages (from-to)25-33
Number of pages9
JournalEuropean Journal of Medicinal Chemistry
Early online date31 Aug 2018
Publication statusPublished - 5 Oct 2018



  • Inhibitors
  • Non-competitive
  • Trans-sialidase
  • Trypanosoma cruzi
  • α-aminophosphonates

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery
  • Organic Chemistry

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