title: Lumazine synthase from Candida albicans as an anti-fungal target enzyme: structural and biochemical basis for drug design.
abstract: Lumazine synthase is an enzyme involved in riboflavin biosynthesis in many plants and microorganisms, including numerous human pathogens. The fact that the enzymes of the riboflavin biosynthesis pathway are not present in the human or animal host makes them potential targets for anti-infective agents. The crystal structure of lumazine synthase from Candida albicans was solved by molecular replacement and refined at 2.5-Angstrom resolution. The results of crystallographic investigations and sedimentation equilibrium experiments clearly indicated the presence of pentameric assemblies of the enzyme either in crystals or in solution. Isothermal titration calorimetry measurements of the binding reactions of four different inhibitors revealed high affinity for all four compounds with binding constants in the micromolar range. Structural comparison with previously determined structures of the enzyme.ligand complexes of other orthologue allowed modeling of the binding of four different inhibitors into the active site of lumazine synthase from Candida albicans.
authors: Karolinska Institutet, NOVUM, Centre for Structural Biochemistry, Halsovagen 7-9, S-14157 Huddinge, Sweden. katja.morgunova@biosci.ki.se
authors: Ekaterina
authors: E
authors: Morgunova
authors: Sabine
authors: S
authors: Saller
authors: Ilka
authors: I
authors: Haase
authors: Mark
authors: M
authors: Cushman
authors: Adelbert
authors: A
authors: Bacher
authors: Markus
authors: M
authors: Fischer
authors: Rudolf
authors: R
authors: Ladenstein
mesh_terms: D000595:Amino Acid Sequence; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology*; D002176:Candida albicans / Q000201:enzymology*; D003001:Cloning, Molecular; D015195:Drug Design; D004791:Enzyme Inhibitors / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000378:metabolism*; D011487:Protein Conformation; D017386:Sequence Homology, Amino Acid; D014461:Ultracentrifugation
chemical_list: D000935:Antifungal Agents; D004791:Enzyme Inhibitors; D009097:Multienzyme Complexes; C044822:6,7-dimethyl-8-ribityllumazine synthase