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EC Number
sitting drop vapor diffusion method, using HEPES buffer (100 mM, pH 7.5 with 2 M (NH4)2SO4)
the covalent adduct formed between irreversible mechanism based inhibitors, 3-methylene-4-penten-1-yl diphosphate or 3-oxiranyl-3-buten-1-yl diphosphate, and the flavin cofactor are investigated by X-ray crystallography and UV-visible spectroscopy. Both the crystal structures of enzyme binding the flavin-inhibitor adduct and the UV-visible spectra of the adducts indicate that the covalent bond is formed at C4a of flavin rather than at N5. The high-resolution crystal structures of enzyme-substrate complexes and the kinetic studies of new mutants confirm that only the flavin cofactor can catalyze protonation of the substrates and suggest that N5 of flavin is most likely to be involved in proton transfer
crystallized at 20°C using the hanging-drop vapor diffusion method with a reservoir solution containing 0.1 M Tris-HCl (pH 8.0), 0.2 M sodium citrate, and 30% (vol/vol) polyethylene glycol 400 (PEG 400)
sitting drop vapor diffusion method, using 0.6 M calcium acetate and 50 mM HEPES pH 7.5
the crystal structures of the substrate-free enzyme and of the substrate-enzyme complexes, in the oxidized and reduced states, are solved to resolutions between 1.99 and 3.1 A, six distinct types of type 2 IDI crystals are obtained
molecular modeling of structure and comparison with structures of Streptococcus pneumoniae and Thermus thermophilus enzymes
in complex with diphosphate. The diphosphate moiety is located near the conserved residues H10, R97, H152, Q157, E158, and W219, and the flavin cofactor. The putative active site may stabilize a carbocationic intermediate
comparison of orthorhombic, monoclinic and trigonal crystal forms, up to 2.2 A resolution. Crystallization of free enzyme and in complex wih transition-state analogue N,N-dimethyl-2-amino-1-ethyl diphosphate
native enzyme at 1.7 A and in complex with substrate at 1.9 A resolution. comparison with Escherichia coli enzyme structure
enzyme shows a flexible N-terminal alpha-helix covering the active pocket and blocking the entrance. Substrate binding induces conformational change in the active site. A water molecule is the direct proton donor for the substrate
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