Synthesis and in vitro/in vivo Evaluation of the Antitrypanosomal Activity of 3-Bromoacivicin, a Potent CTP Synthetase Inhibitor

Paola Conti, Andrea Pinto, Pui E. Wong, Louise L. Major, Lucia Tamborini, Maria C. Iannuzzi, Carlo De Micheli, Michael P. Barrett, Terry K. Smith

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The first convenient synthesis of enantiomerically pure (alpha S,5S)-alpha-amino-3-bromo-4,5-dihydroisoxazol-5-yl acetic acid (3-bromoacivicin) is described. We demonstrate that 3-bromoacivicin is a CTP synthetase inhibitor three times as potent as its 3-chloro analogue, the natural antibiotic acivicin. Because CTP synthetase was suggested to be a potential drug target in African trypanosomes, the in vitro/in vivo antitrypanosomal activity of 3-bromoacivicin was assessed in comparison with acivicin. Beyond expectation, we observed a 12-fold enhancement in the in vitro antitrypanosomal activity, while toxicity against mammalian cells remained unaffected. Despite its good in vitro activity and selectivity, 3-bromoacivicin proved to be trypano-static and failed to completely eradicate the infection when tested in vivo at its maximum tolerable dose.

Original languageEnglish
Pages (from-to)329-333
Number of pages5
JournalChemMedChem
Volume6
Issue number2
Early online date22 Dec 2010
DOIs
Publication statusPublished - 7 Feb 2011

Keywords

  • amino acids
  • CTP synthetase
  • inhibitors
  • transferases
  • trypanosoma
  • AFRICAN SLEEPING SICKNESS
  • ACIVICIN
  • ACID

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