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Conformation selectivity in the binding of diazepam and analogues to alpha1-acid glycoprotein.

Fitos I, Visy J, Zsila F, Mády G, Simonyi M

Department of Molecular Pharmacology, Institute of Biomolecular Chemistry Chemical Research Center, Hungarian Academy of Sciences, PO Box 17, H-1525 Budapest, Hungary. fitosi@chemres.hu

Diazepam, a 1,4-benzodiazepine lacking chiral centre, exists in an equimolar mixture of two chiral conformers. Induced circular dichroism spectra for the binding of diazepam and its 3,3-dimethyl substituted analogues to alpha1-acid glycoprotein (AGP) revealed that opposite to human serum albumin, AGP preferably binds the P-conformers. Accordingly, slightly favoured binding of (R)-enantiomers of 3-alkyl derivatives having P-conformation was found. In case of 3-acyloxy derivatives, however, AGP preferably binds the (S)-enantiomers. Studies with the separated genetic variants of AGP proved similar binding affinities, but markedly different conformation selectivities. For diazepam bound by the F1-S variant, a P/M selectivity of about 2 could be estimated.

Published 6 June 2007 in Bioorg Med Chem, 15(14): 4857-62.
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