Fiche publication
Date publication
mai 2015
Journal
Analytical biochemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Dr DELSUC Marc-André
Tous les auteurs :
Assemat O, Antoine M, Fourquez JM, Wierzbicki M, Charton Y, Hennig P, Perron-Sierra F, Ferry G, Boutin JA, Delsuc MA
Lien Pubmed
Résumé
Human hexokinase enzyme IV (EC 2.7.1.1) catalyzes the phosphorylation of glucose and regulates the level of glucose. This enzyme exhibits strong positive cooperativity due to an allosteric transition between an inactive form and a closed active form. This form can be stabilized by activators and, thus, can increase its turnover by a kinetic memory effect characterized by a slow decay to the inactive state. The structural details of this kinetic allostery are known. Several synthetic activators have been reported. We present a preliminary nuclear magnetic resonance (NMR) screening of a chemical library in search of molecules with some affinity for glucokinase (GK). The library, composed of eight molecules with known activity as well as molecules that display no interaction, has been tested using the FAXS (fluorine chemical shift anisotropy and exchange for screening) method, based on monitoring the R2 relaxation of the (19)F spin. To ensure a valid interaction measurement, the enzyme was placed in the presence of glucose and magnesium. The binding signal of one known fluorinated ligand was measured by determining the displacement of the known ligand. This simple measure of the (19)F signal intensity after an 80-ms spin echo correlates nicely with the EC50, opening a route for NMR screening of GK activators.
Mots clés
Drug Evaluation, Preclinical, Enzyme Activators, pharmacology, Glucokinase, metabolism, Halogenation, Humans, Ligands, Magnetic Resonance Spectroscopy, methods
Référence
Anal. Biochem.. 2015 May;477:62-8
