Correlating the Properties of Antibiotics with the Energetics of Partitioning in Colloidal Self-Assemblies and the Effect on the Binding of a Released Drug with a Target Protein

Abstract

The bioavailability of drugs and the monitoring of efficient dosage requires drug delivery through suitable vehicles. The partitioning characteristics of the drugs in the delivery vehicles is determined by their molecular features and structure. A quantitative understanding of the partitioning of drugs into delivery media and its subsequent release and binding to the target protein is essential to deriving guidelines for rational drug design. We have studied the partitioning of aminoglycosides and macrolide antibiotic drugs kanamycin, gentamicin, azithromycin, and erythromycin in cationic, nonionic, and the mixture of cationic and nonionic self-assemblies. The quantitative aspects of drug partitioning followed by the monitoring of its interaction with target model protein bovine serum albumin on subsequent release have been performed by using a combination of spectroscopy and high-sensitivity calorimetry. The mechanisms of partitioning have been analyzed on the basis of the values of standard molar enthalpy, entropy, the Gibbs free-energy change, and stoichiometry of interaction. The integrity of the binding sites and the effects of the components of the self-assemblies and the released drug on the serum albumin were analyzed by using differential scanning calorimetry and circular dichroism spectroscopy. The thermodynamic signatures of drug partitioning and subsequent binding to target protein have enabled an in-depth correlation of the structure− property−energetics relationships which are crucial for the broader objective of rational drug design.

Physicochemical insights into the micelle-based drug-delivery of bioactive compounds to the carrier protein

“…Here also ∼10 nm blue shift was observed as it was observed in the case of micelles of HTAB and TX-100 alone. 32,33 The values of K B and n obtained were (6.03 ± 0.12) × 10 3 M −1 and (1.09 ± 0.06), respectively, which are similar to the values of K B and n obtained in the presence of TX-100 micelles alone. When the ITC experiment was performed, it was found that the isotherm is fitted best to a two sequential site binding model as it was observed in the case of TX-100 alone (Fig.…”

The effect of selected aminoglycoside antibiotics on human serum albumin antioxidant activity: a spectroscopic and calorimetric comparative study

“…In addition, KAN and NEO do not influence on HSA secondary structure. Using the same technique of CD spectrometry to study the interaction between antibiotics, e.g., kanamycin, and bovine serum albumin (BSA), Judy et al found that due to the stronger affinity toward BSA (relative to HSA), KAN does not modulate the secondary structure of BSA (statistically non-significant) [ 36 ]. Owczarzy et al [ 33 , 37 ] analyzed the interaction between 5-alkyl-12(H)-quino[3,4-b][1,4]benzothiazinium derivatives (Salt1, Salt2) and human carrier proteins, including HSA.…”