Allosteric interactions are important in many biological processes. They occur when the interactions of one substance with a binding agent changes the interactions of a second substance with the same agent at a separate site. Such interactions are often observed during the binding of drugs to blood proteins such as human serum albumin (HSA)1,2. Most previous studies of allosteric interactions have involved only qualitative observations of increased or decreased binding. In this study, we present an approach for quantitatively characterizing such allosteric effects using protein columns. The method is used to examine the interactions of ibuprofen/S-lorazepam acetate, S-oxazepam hemisuccinate/R-oxazepam hemisuccinate, and L-tryptophan/phenytoin during their binding to HSA. This approach can be applied to other receptors or biopolymers and can be used to independently examine the effects of two competing agents during an allosteric interaction.
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This work was supported by the National Institutes of Health under grant R01 GM44931. The data used from ref. 2 were kindly provided by I. Fitos.
The authors declare no competing financial interests.
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Chen, J., Hage, D. Quantitative analysis of allosteric drug-protein binding by biointeraction chromatography. Nat Biotechnol 22, 1445–1448 (2004). https://doi.org/10.1038/nbt1022
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