X-ray structural analysis of Plasmodium falciparum enoyl acyl carrier protein reductase as a pathway toward the optimization of triclosan antimalarial efficacy

Joel S. Freundlich, Feng Wang, Han Chun Tsai, Mack Kuo, Hong Ming Shieh, John W. Anderson, Louis J. Nkrumah, Juan Carlos Valderramos, Min Yu, T. R.Santha Kumar, Stephanie G. Valderramos, William R. Jacobs, Guy A. Schiehser, David P. Jacobus, David A. Fidock, James C. Sacchettini

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

The x-ray crystal structures of five triclosan analogs, in addition to that of the isoniazid-NAD adduct, are described in relation to their integral role in the design of potent inhibitors of the malarial enzyme Plasmodium falciparum enoyl acyl carrier protein reductase (PfENR). Many of the novel 5-substituted analogs exhibit low micromolar potency against in vitro cultures of drug-resistant and drug-sensitive strains of the P. falciparum parasite and inhibit purified PfENR enzyme with IC50 values of <200 nM. This study has significantly expanded the knowledge base with regard to the structure-activity relationship of triclosan while affording gains against cultured parasites and purified PfENR enzyme. In contrast to a recent report in the literature, these results demonstrate the ability to improve the in vitro potency of triclosan significantly by replacing the suboptimal 5-chloro group with larger hydrophobic moieties. The biological and x-ray crystallographic data thus demonstrate the flexibility of the active site and point to future rounds of optimization to improve compound potency against purified enzyme and intracellular Plasmodium parasites.

Original languageEnglish (US)
Pages (from-to)25436-25444
Number of pages9
JournalJournal of Biological Chemistry
Volume282
Issue number35
DOIs
StatePublished - Aug 31 2007

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint

Dive into the research topics of 'X-ray structural analysis of Plasmodium falciparum enoyl acyl carrier protein reductase as a pathway toward the optimization of triclosan antimalarial efficacy'. Together they form a unique fingerprint.

Cite this