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Measurements of Ion Binding to Lipid-Hosted Ionophores by Affinity Chromatography

Ross, Eric E., Hoag, Bridget, Joslin, Ian, Johnston, Taylor
Langmuir 2019 v.35 no.29 pp. 9410-9421
affinity chromatography, binding capacity, binding sites, enthalpy, gramicidin, ions, lipid bilayers, models, phosphatidylcholines, potassium, silica, valinomycin
The binding affinity between antibiotic ionophores and alkali ions within supported lipid bilayers was evaluated using affinity chromatography. We used zonal elution and frontal analysis methods in nanovolume liquid chromatography to characterize the binding selectivity of the carrier and channel ionophores valinomycin and gramicidin A within different phosphatidylcholine bilayers. Distinct binding sensitivity to the lipid phase, both in affinity and selectivity, is observed for valinomycin, whereas gramicidin is less sensitive to changes in a membrane environment, behavior that is consistent with ion binding occurring within the interior of an established channel. There is good agreement between the chromatographic retention and the reported binding selectivity measured by other techniques. Surface potential near the binding site affects ion retention and the apparent association binding constants, but not the binding selectivity or enthalpy measurements. A model accounting for the surface potential contributions of retained ions during frontal analyses yields values close to intrinsic binding constants for gramicidin A (KA for K⁺ between 70 and 120 M–¹) using reasonable estimates of the initial potential that is postulated to arise from the underlying silica.