2xcg

Tranylcypromine-inhibited human monoamine oxidase B in complex with 2- (2-benzofuranyl)-2-imidazoline

spinqualitylabelsall models 2xcg, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2xcg is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: 3PL, C15, FA8, XCG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AOFB_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. 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 Crystallographic and biochemical studies have been employed to identify the binding site and mechanism for potentiation of imidazoline-binding in human monoamine oxidase B (MAO B). 2-(2-Benzofuranyl)-2-imidazoline (2-BFI) inhibits recombinant human MAO B with a Ki of 8.3+/-0.6 muM whereas tranylcypromine-inhibited MAO B binds 2-BFI with a Kd of 9+/-2 nM, representing an increase in binding energy Delta(DeltaG) of -3.9 kcal/mol. Crystal structures show the imidazoline ligand bound in a site that is distinct from the substrate-binding cavity. Contributions to account for the increase in binding affinity upon tranylcypromine inhibition include a conformational change in the side chain of Gln206 and a "closed conformation" of the side chain of Ile199, forming a hydrophobic "sandwich" with the side chain of Ile316 on each face of the benzofuran ring of 2-BFI. Data with the Ile199Ala mutant of human MAO B and failure to observe a similar binding potentiation with rat MAO B, where Ile316 is replaced with a Val residue, support an allosteric mechanism where the increased binding affinity of 2-BFI results from a cooperative increase in H-bond strength through formation of a more hydrophobic milieu. These insights should prove valuable in the design of high affinity and specific reversible MAO B inhibitors. Potentiation of ligand binding through cooperative effects in monoamine oxidase B.,Bonivento D, Milczek EM, McDonald GR, Binda C, Holt A, Edmondson DE, Mattevi A J Biol Chem. 2010 Sep 20. PMID:20855894 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Monoamine oxidase

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