Structural highlights
FunctionAOFB_HUMAN Catalyzes the oxidative deamination of biogenic and xenobiotic amines and has important functions in the metabolism of neuroactive and vasoactive amines in the central nervous system and peripheral tissues. MAOB preferentially degrades benzylamine and phenylethylamine. Publication Abstract from PubMedMonoamine oxidase B (MAO-B) is a validated drug target for Parkinson's disease. Chromone derivatives were identified as novel potent and reversible MAO-B inhibitors, and herewith we report on a crystallographic and biochemical analysis to investigate their inhibition mechanism. The crystal structures of human MAO-B in complex with three chromone analogs bearing different substituents on the exocyclic aromatic ring (determined at 1.6-1.8 A resolution) showed that they all bind in the active site cavity of the protein with the chromone moiety located in front of the FAD cofactor. These inhibitors form two hydrogen bonds with Tyr435 and Cys172 and perfectly fit the hydrophobic flat active site of human MAO-B. This is reflected in their tight-binding mechanism of inhibition with Ki values of 55, 17, and 31 nM for N-(3',4'-dimethylphenyl)-4-oxo-4 H-chromene-3-carboxamide (1), N-(3'-chlorophenyl)-4-oxo-4 H-chromene-3-carboxamide (2), and N-(3'-fluorophenyl)-4-oxo-4 H-chromene-3-carboxamide (3), respectively. These compounds were also 1000-fold more effective than l-deprenyl in reducing the cellular levels of reactive oxygen species (ROS). Tight-Binding Inhibition of Human Monoamine Oxidase B by Chromone Analogs: A Kinetic, Crystallographic, and Biological Analysis.,Reis J, Manzella N, Cagide F, Mialet-Perez J, Uriarte E, Parini A, Borges F, Binda C J Med Chem. 2018 Apr 20. doi: 10.1021/acs.jmedchem.8b00357. PMID:29648817[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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