Abstract
A series of rhodanine derivatives bearing 4-(furan-2-yl)benzoic acid moiety were synthesized and studied as inhibitors of xanthine oxidase. This enzyme is a known target for allopurinol and febuxostat used in the treatment of hyperuricemia, gout, and other diseases. The synthesized compounds with different substituents in position 3 of the rhodanine ring showed in vitro inhibitory activities towards xanthine oxidase in a low micromolar concentration range. The 4-(furan-2-yl)benzoic acid derivative with a fragment of N-unsubstituted rhodanine was found to have the lowest IC50 value which does not depend on the presence of albumin or Tween-80 under the assay conditions. According to kinetic data, the rhodanine-based 4-(furan-2-yl)benzoic acid was a mixed-type inhibitor with the same affinity for the free enzyme and the enzyme-substrate complex. Molecular docking and molecular dynamic studies were performed to elucidate the binding mode of this compound in the active site of xanthine oxidase
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