Selective binding of coumarin enantiomers to human α1-acid glycoprotein genetic variants

Eszter Hazai, Júlia Visy, Ilona Fitos, Zsolt Bikádi, Miklós Simonyi

Research output: Contribution to journalArticle

23 Citations (Scopus)


Coumarin-type anticoagulants, warfarin, phenprocoumon and acenocoumarol, were tested for their stereoselective binding to the human orosomucoid (ORM; AGP) genetic variants ORM 1 and ORM 2. Direct binding studies with racemic ligands were carried out by the ultrafiltration method; the concentrations of free enantiomers were determined by capillary electrophoresis. The binding of pure enantiomers was investigated with quinaldine red fluorescence displacement measurements. Our results demonstrated that all investigated compounds bind stronger to ORM 1 variant than to ORM 2. ORM 1 and human native AGP preferred the binding of (S)-enantiomers of warfarin and acenocoumarol, while no enantioselectivity was observed in phenprocoumon binding. Acenocoumarol possessed the highest enantioselectivity in AGP binding due to the weak binding of its (R)-enantiomer. Furthermore, a new homology model of AGP was built and the models of ORM 1 and ORM 2 suggested that difference in binding to AGP genetic variants is caused by steric factors.

Original languageEnglish
Pages (from-to)1959-1965
Number of pages7
JournalBioorganic and Medicinal Chemistry
Issue number6
Publication statusPublished - Mar 15 2006


  • AGP
  • Acenocoumarol
  • CE, capillary electrophoresis
  • Capillary electrophoresis
  • Displacement study
  • Genetic variants
  • Molecular modelling
  • ORM, orosomucoid
  • Phenprocoumon
  • QR, quinaldine red
  • Warfarin
  • α- acid glycoprotein

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry

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