The use of natural product scaffolds as leads in the search for trypanothione reductase inhibitors

  • Galarreta B
  • Sifuentes R
  • Carrillo A
 et al. 
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Twenty-three heterocyclic compounds were evaluated for their potential as trypanothione reductase inhibitors. As a result, the harmaline, 10-thiaisoalloxazine, and aspidospermine frameworks were identified as the basis of inhibitors of Trypanosoma cruzi trypanothione reductase. Two new compounds showed moderately strong, linear competitive inhibition, namely N,N-dimethyl-N-[3-(7-methoxy-1-methyl-3,4-dihydro-9H-β-carbolin-9-yl)propyl]amine (15) and 1,3-bis[3-(dimethylamino)propyl]-1,5-dihydro-2H-pyrimido[4,5-b][1,4]benzothiazine-2,4(3H)-dione (21), with Kivalues of 35.1 ± 3.5 μM and 26.9 ± 1.9 μM, respectively. Aspidospermine (25) inhibited T. cruzi TryR with a Kiof 64.6 ± 6.2 μM. None of the compounds inhibited glutathione reductase. Their toxicity toward promastigotes of Leishmania amazonensis was assessed. © 2008 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Enzymatic inhibition
  • Linear competitive inhibitors
  • Trypanosomatid
  • Trypanothione reductase

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  • Roxana Sifuentes

  • Angela K. Carrillo

  • Luis Sanchez

  • Maria del Rosario I. Amado

  • Helena Maruenda

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