A reversible monoamine oxidase a inhibitor, befloxatone: Structural approach of its mechanism of action

Johan Wouters, Florence Moureau, Guy Evrard, Jean Jacques Koenig, Samir Jegham, Pascal George, François Durant

Research output: Contribution to journalArticlepeer-review


Experimental and theoretical physico-chemical methods were used to investigate the interaction between several reversible monoamine oxidase A inhibitors in the oxazolidinone series and the active site of the enzyme. Phenyloxazolidinones include toloxatone and analogues, among which befloxatone was selected as drug candidate for the treatment of depression. Identification of the forces responsible for the crystal cohesion of befloxatone reveals functional groups that could interact with monoamine oxidase. Calculation of electronic properties of those compounds using ab initio molecular orbital methods lead to a description of the mode of interaction between befloxatone and the cofactor of the enzyme. Electronic absorption spectroscopy measurements confirm the hypothesis of a privileged interaction of phenyloxazolidinone-type inhibitors with the flavin cofactor of MAO. Additional sites of interaction with the protein core of MAO A are also examined with regard to the primary structure of the enzyme. As a result of this work, a model is proposed for the reversible inhibition of MAO A by befloxatone via long distance, reversible interactions with the flavin adenine dinucleotide (FAD) cofactor of the enzyme and with specific amino acids of the active site. This model is partially corroborated by experimental evidence and should be helpful in designing new potent inhibitors of monoamine oxidase. Copyright (C) 1999 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)1683-1693
Number of pages11
JournalBioorganic and Medicinal Chemistry
Issue number8
Publication statusPublished - 1 Aug 1999


  • Befloxatone
  • Enzyme inhibitors
  • Monoamine oxidase
  • X-ray crystal structures


Dive into the research topics of 'A reversible monoamine oxidase a inhibitor, befloxatone: Structural approach of its mechanism of action'. Together they form a unique fingerprint.

Cite this