Quantum chemical analysis of the deferiprone–iron binding reaction
Authors Viroj Wiwanitkit
Published 15 March 2006 Volume 2006:1(1) Pages 111—113
Department of Laboratory Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
Abstract: To prevent side effects of excessive accumulation of iron in the body, chelation therapy is recommended in transfusion-dependent patients. The reaction between deferiprone and iron to form a complex red substance can be described as 3 molecules of the chelator, deferiprone, reacting with a molecule of iron. However, the actual mechanism of the deferiprone – iron binding reaction is not well understood. A quantum chemical analysis of the deferiprone – iron binding reaction was performed, focusing on the reaction between 1 molecule of deferiprone and 1 molecule of iron. The two main alternative pathways for the deferiprone – iron binding reaction were shown to be C-C cleavage and C-O cleavage. The required energy for complex formation in C-C cleavage was less than for C-O cleavage. The total energy requirement for C-C cleavage was negative, implying that this reaction can occur without any external energy source. The resulting complex fits the reported tertiary structure model for the deferiprone – iron complex.
Keywords: deferiprone, complex, iron, quantum analysis, energy