1xc7

Binding of beta-D-glucopyranosyl bismethoxyphosphoramidate to glycogen phosphorylase b: Kinetic and crystallographic studies

spinqualitylabelsall models 1xc7, resolution 1.83Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xc7 is a 1 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.83Å Ligands: GL6, PLP, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PYGM_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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed In an attempt to identify a new lead molecule that would enable the design of inhibitors with enhanced affinity for glycogen phosphorylase (GP), beta-D-glucopyranosyl bismethoxyphosphoramidate (phosphoramidate), a glucosyl phosphate analogue, was tested for inhibition of the enzyme. Kinetic experiments showed that the compound was a weak competitive inhibitor of rabbit muscle GPb (with respect to alpha-D-glucose-1-phosphate (Glc-1-P)) with a Ki value of 5.9 (+/-0.1) mM. In order to elucidate the structural basis of inhibition, we determined the structure of GPb complexed with the phosphoramidate at 1.83 A resolution. The complex structure reveals that the inhibitor binds at the catalytic site and induces significant conformational changes in the vicinity of this site. In particular, the 280s loop (residues 282-287) shifts 0.4-4.3 A (main-chain atoms) to accommodate the phosphoramidate, but these conformational changes do not lead to increased contacts between the inhibitor and the protein that would improve ligand binding. Binding of beta-D-glucopyranosyl bismethoxyphosphoramidate to glycogen phosphorylase b: kinetic and crystallographic studies.,Chrysina ED, Kosmopoulou MN, Kardakaris R, Bischler N, Leonidas DD, Kannan T, Loganathan D, Oikonomakos NG Bioorg Med Chem. 2005 Feb 1;13(3):765-72. PMID:15653344 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glycogen phosphorylase 3D structures

Proteopedia Page Contributors and Editors (what is this?)

OCA