5mem
From Proteopedia
A potent fluorescent inhibitor of glycogen phosphorylase as a catalytic site probe.
Structural highlights
FunctionPYGM_RABIT Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties. Publication Abstract from PubMedThe design and synthesis of a glucose-based acridone derivative (GLAC), a potent inhibitor of glycogen phosphorylase (GP) are described. GLAC is the first inhibitor of glycogen phosphorylase, the electronic absorption properties of which are clearly distinguishable from those of the enzyme. This allows probing subtle interactions in the catalytic site. The GLAC absorption spectra, associated with X-ray crystallography and quantum chemistry calculations, reveal that part of the catalytic site of GP behaves as a highly basic environment in which GLAC exists as a bis-anion. This is explained by water-bridged hydrogen-bonding interactions with specific catalytic site residues. A New Potent Inhibitor of Glycogen Phosphorylase Reveals the Basicity of the Catalytic Site.,Mamais M, Degli Esposti A, Kouloumoundra V, Gustavsson T, Monti F, Venturini A, Chrysina ED, Markovitsi D, Gimisis T Chemistry. 2017 Jul 3;23(37):8800-8805. doi: 10.1002/chem.201701591. Epub 2017, Jun 19. PMID:28493496[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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