Fluorine-19 NMR studies of glucosyl fluoride transport in human erythrocytes.
AUTOR(ES)
London, R E
RESUMO
Fluorine-19 magnetization transfer studies have been used to measure the transport rate of glucopyranosyl fluorides under equilibrium exchange conditions. Although rate constants and permeabilities could be determined for beta-D-glucopyranosyl fluoride, the exchange rate for alpha-D-glucopyranosyl fluoride was found to be too slow for determination using this method. The time-dependent decomposition of the beta-glucopyranosyl fluoride also limits the accuracy of the numerical results for this species; however, it is clear that the permeabilities of the alpha and beta forms differ significantly, i.e., P beta > P alpha. This observation is in contrast to recent observations for n-fluoro-n-deoxyglucose, for which P alpha > P beta for n = 2, 3, 4, or 6. The difference can be explained in terms of a simple alternating conformation model in which one of the conformations (with an external sugar-binding site) exhibits a preference for the beta form of the molecule, while the second conformation (with an internal sugar binding site) exhibits a preference for the alpha form. Fluorine/hydroxyl substitutions unmask these preferences by selectively reducing the binding to one of the conformations, depending on the specific site of fluorination.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1236414Documentos Relacionados
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