Kinetic and crystallographic studies of glucopyranose spirohydantoin and glucopyranosylamine analogs inhibitors of glycogen phosphorylase.Watson, K.A., Chrysina, E.D., Tsitsanou, K.E., Zographos, S.E., Archontis, G., Fleet, G.W., Oikonomakos, N.G.
(2005) Proteins 61: 966-983
- PubMed: 16222658
- DOI: 10.1002/prot.20653
- Primary Citation of Related Structures:  1FS4, 1FTQ, 1FTW, 1FTY, 1FU4, 1FU7
- PubMed Abstract:
- N-Acetyl-Beta-D-Glucopyranosylamine: A Potent T-State Inhibitor of Glycogen Phosphorylase. A Comparison with Alpha-D-Glucose
Oikonomakos, N.G.,Kontou, M.,Zographos, S.E.,Watson, K.A.,Johnson, L.N.,Bichard, C.J.,Fleet, G.W.,Acharya, K.R.
(1995) Protein Sci. 4: 2469
- Potent Inhibition of Glycogen Phosphorylase by a Spirohydantoin of Glucopyranose: First Pyranose Analogues of Hydantocidin
Bichard, C.J.F.,Mitchell, E.P.,Wormald, M.R.,Watson, K.A.,Johnson, L.N.,Zographos, S.E.,Koutra, D.D.,Oikonomakos, N.G.,Fleet, G.W.J.
(1995) Tetrahedron Lett. 36: 2145
- The Structure of a Glycogen Phosphorylase Glucopyranose Spirohydantoin Complex at 1.8 A Resolution and 100K: The Role of the Water Structure and its Contribution to Binding
Gregoriou, M.,Noble, M.E.,Watson, K.A.,Garman, E.F.,Krulle, T.M.,de la Fuente, C.,Fleet, G.W.,Oikonomakos, N.G.,Johnson, L.N.
(1998) Protein Sci. 7: 915
- Design of Inhibitors of Glycogen Phosphorylase: A Study of Alpha- and Beta-C-Glucosides and 1-Thio-Beta-D-Glucose Compounds
Watson, K.A.,Mitchell, E.P.,Johnson, L.N.,Son, J.C.,Bichard, C.J.,Orchard, M.G.,Fleet, G.W.,Oikonomakos, N.G.,Leonidas, D.D.,Kontou, M.,Papageorgiou, A.C.
(1994) Biochemistry 33: 5745
Glycogen phosphorylase (GP) is currently exploited as a target for inhibition of hepatic glycogenolysis under high glucose conditions. Spirohydantoin of glucopyranose and N-acetyl-beta-D-glucopyranosylamine have been identified as the most potent inh ...
Glycogen phosphorylase (GP) is currently exploited as a target for inhibition of hepatic glycogenolysis under high glucose conditions. Spirohydantoin of glucopyranose and N-acetyl-beta-D-glucopyranosylamine have been identified as the most potent inhibitors of GP that bind at the catalytic site. Four spirohydantoin and three beta-D-glucopyranosylamine analogs have been designed, synthesized and tested for inhibition of GP in kinetic experiments. Depending on the functional group introduced, the K(i) values varied from 16.5 microM to 1200 microM. In order to rationalize the kinetic results, we determined the crystal structures of the analogs in complex with GP. All the inhibitors bound at the catalytic site of the enzyme, by making direct and water-mediated hydrogen bonds with the protein and by inducing minor movements of the side chains of Asp283 and Asn284, of the 280s loop that blocks access of the substrate glycogen to the catalytic site, and changes in the water structure in the vicinity of the site. The differences observed in the Ki values of the analogs can be interpreted in terms of variations in hydrogen bonding and van der Waals interactions, desolvation effects, ligand conformational entropy, and displacement of water molecules on ligand binding to the catalytic site.
Laboratory of Molecular Biophysics, University of Oxford, Oxford, United Kingdom.