Novel Pyridazinone Inhibitors for Vascular Adhesion Protein-1 (VAP-1): Old Target-New Inhibition Mode

Eva Bligt-Lindén, Marjo Pihlavisto, István Szatmári, Zbyszek Otwinowski, David J. Smith, László Lázár, Ferenc Fülöp, Tiina Salminen

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    28 Citations (Scopus)


    Vascular adhesion protein-1 (VAP-1) is a primary amine oxidase and a drug target for inflammatory and vascular diseases. Despite extensive attempts to develop potent, specific, and reversible inhibitors of its enzyme activity, the task has proven challenging. Here we report the synthesis, inhibitory activity, and molecular binding mode of novel pyridazinone inhibitors, which show specificity for VAP-1 over monoamine and diamine oxidases. The crystal structures of three inhibitor VAP-1 complexes show that these compounds bind reversibly into a unique binding site in the active site channel. Although they are good inhibitors of human VAP-1, they do not inhibit rodent VAP-1 well. To investigate this further, we used homology modeling and structural comparison to identify amino acid differences, which explain the species-specific binding properties. Our results prove the potency and specificity of these new inhibitors, and the detailed characterization of their binding mode is of importance for further development of VAP-1 inhibitors.
    Original languageUndefined/Unknown
    Pages (from-to)9837–9848
    Number of pages12
    JournalJournal of Medicinal Chemistry
    Issue number24
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

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