Download MendeleyStructure-activity analysis of the purine binding site of human liver glycogen phosphorylase.
Ekstrom, J.L., Pauly, T.A., Carty, M.D., Soeller, W.C., Culp, J., Danley, D.E., Hoover, D.J., Treadway, J.L., Gibbs, E.M., Fletterick, R.J., Day, Y.S., Myszka, D.G., Rath, V.L.(2002) Chem Biol 9: 915-924
- PubMed: 12204691
- DOI: https://doi.org/10.1016/s1074-5521(02)00186-2
- Primary Citation of Related Structures:
1L5Q, 1L5R, 1L5S, 1L7X - PubMed Abstract:
Human liver glycogen phosphorylase (HLGP) catalyzes the breakdown of glycogen to maintain serum glucose levels and is a therapeutic target for diabetes. HLGP is regulated by multiple interacting allosteric sites, each of which is a potential drug binding site. We used surface plasmon resonance (SPR) to screen for compounds that bind to the purine allosteric inhibitor site. We determined the affinities of a series of compounds and solved the crystal structures of three representative ligands with K(D) values from 17-550 microM. The crystal structures reveal that the affinities are partly determined by ligand-specific water-mediated hydrogen bonds and side chain movements. These effects could not be predicted; both crystallographic and SPR studies were required to understand the important features of binding and together provide a basis for the design of new allosteric inhibitors targeting this site.
Organizational Affiliation:
Exploratory Medicinal Sciences, Groton, CT 06340, USA.
