The 1.76 A Resolution Crystal Structure of Glycogen Phosphorylase B Complexed with Glucose, and Cp320626, a Potential Antidiabetic DrugOikonomakos, N.G., Zographos, S.E., Skamnaki, V.T., Archontis, G.
(2002) Bioorg.Med.Chem. 10: 1313
- PubMed: 11886794
- PubMed Abstract:
- A New Allosteric Site in Glycogen Phosphorylase B as a Target for Drug Interactions
Oikonomakos, N.G.,Skamnaki, V.T.,Tsitsanou, K.E.,Gavalas, N.G.,Johnson, L.N.
(2000) Structure 8: 575
CP320626, a potential antidiabetic drug, inhibits glycogen phosphorylase in synergism with glucose. To elucidate the structural basis of synergistic inhibition, we determined the structure of muscle glycogen phosphorylase b (MGPb) complexed with both ...
CP320626, a potential antidiabetic drug, inhibits glycogen phosphorylase in synergism with glucose. To elucidate the structural basis of synergistic inhibition, we determined the structure of muscle glycogen phosphorylase b (MGPb) complexed with both glucose and CP320626 at 1.76 A resolution, and refined to a crystallographic R value of 0.211 (R(free)=0.235). CP320626 binds at a novel allosteric site, which is some 33 A from the catalytic site, where glucose binds. The high resolution structure allows unambiguous definition of the conformation of the 1-acetyl-4-hydroxy-piperidine ring supported by theoretical energy calculations. Both CP320626 and glucose promote the less active T-state, thereby explaining their synergistic inhibition. Structural comparison of MGPb--glucose--CP320626 complex with liver glycogen phosphorylase a (LGPa) complexed with a related compound (CP403700) show that the ligand binding site is conserved in LGPa.
Institute of Biological Research and Biotechnology, The National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, Athens 11635, Greece. firstname.lastname@example.org