Halogenation of drugs enhances membrane binding and permeation

Gerebtzoff, G. and Li-Blatter, X. and Fischer, H. and Frentzel, A. and Seelig, A.. (2004) Halogenation of drugs enhances membrane binding and permeation. ChemBioChem, Vol. 5, H. 5. pp. 676-684.

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Official URL: http://edoc.unibas.ch/dok/A5258469

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Halogenation of drugs is commonly used to enhance membrane binding and permeation. We quantify the effect of replacing a hydrogen residue by a chlorine or a trifluoromethyl residue in position C-2 of promazine, perazine, and perphenazine analogues. Moreover, we investigate the influence of the position (C-6 and C-7) of residue CF(3) in benzopyranols. The twelve drugs are characterized by surface activity measurements, which yield the cross-sectional area, the air-water partition coefficient, and the critical micelle concentration. By using the first two parameters (A(D) and K(aw)) and the appropriate membrane packing density, the lipid-water partition coefficients, are calculated in excellent agreement with the lipid-water partition coefficients measured by means of isothermal titration calorimetry for small unilamellar vesicles of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine. Replacement of a hydrogen residue by a chlorine and a trifluoromethyl residue enhances the free energy of partitioning into the lipid membrane, on average by deltaG(lw) approximately -1.3 or -4.5 kJ mol(-1), respectively, and the permeability coefficient by a factor of approximately 2 or approximately 9, respectively. Despite exhibiting practically identical hydrophobicities, the two benzopyranol analogues differ in their permeability coefficients by almost an order of magnitude; this is due to their different cross-sectional areas at the air-water and lipid-water interfaces.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Biophysical Chemistry (Seelig A)
UniBasel Contributors:Seelig-Löffler, Anna
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:20

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