5.1.3.14 hanging drop vapor diffusion method, selenomethionyl enzyme, X-ray structure at 2.5 A of the enzyme with bound UDP 649940 5.1.3.14 purified enzyme MnaA, hanging drop vapor diffusion method, mixing of 31 mg/ml protein solution with crystallization solution containing 0.1 M Tris-HCl, pH 8.0, 0.1 M Na2SO4, 52% PEG 400, 22°C, method optimization, X-ray diffraction structure determination and analysis at 1.9 A resolution, molecular replacement using structure PDB ID 1F6D as template 755205 5.1.3.14 sitting-drop vapor-diffusion method, crystal structures in open and closed conformations. A comparison of these crystal structures shows that upon UDP and UDPGlcNAc binding, the enzyme undergoes conformational changes involving a rigid-body movement of the C-terminal domain 728782 5.1.3.14 ternary complex between the UDP-GlcNAc 2-epimerase, its substrate UDP-GlcNAc and the reaction intermediate UDP, at 1.7 A resolution. Direct interactions between the substrate and UDP via two hydrogen bonds to the alpha- and beta-phosphates of the adjacent UDP molecule, and between the complex and highly conserved enzyme residues. The binding of UDP-GlcNAc is associated with conformational changes in the active site of the enzyme 692076 5.1.3.14 UDP-GlcNAc 2-epimerase in complex with UDPGlcNAc and UDP, X-ray diffraction structure determination and analysis at 1.69 A resolution, molecular replacement using enzyme structure, PDB ID 3BEO, as search model 749249 5.1.3.14 UDP-GlcNAc 2-epimerase in open and closed conformations, and UDP-GlcNAc 2-epimerase in complex with UDPGlcNAc and UDP, sitting drop vapor diffusion method, mixing of 0.001 ml of 5 mg/ml protein in 50 mM Tris-HCl, pH 8.0, 100 mM NaCl, 5% glycerol, and 2 mM tris(2-carboxyethyl)phosphine, with 0.001 ml of reservoir solution containing 40 mM Tris-propane, 60 mM citrate, pH 4.1, and 16% PEG3350, and equilibration against 0.3 ml of reservoir solution at 20°C for 1 week, X-ray diffraction structure determination and analysis at 1.42-2.85 A resolution 749249 5.1.3.14 vapor diffusion method 649142