Discovery of 1,2,4-oxadiazole derivatives as a novel class of noncompetitive inhibitors of 3-hydroxykynurenine transaminase (HKT) from Aedes aegypti

Bioorg Med Chem. 2020 Jan 15;28(2):115252. doi: 10.1016/j.bmc.2019.115252. Epub 2019 Dec 9.

Abstract

The mosquito Aedes aegypti is the vector of arboviruses such as Zika, Chikungunya, dengue and yellow fever. These infectious diseases have a major impact on public health. The unavailability of effective vaccines or drugs to prevent or treat most of these diseases makes vector control the main form of prevention. One strategy to promote mosquito population control is the use of synthetic insecticides to inhibit key enzymes in the metabolic pathway of these insects, particularly during larval stages. One of the main targets of the kynurenine detoxification pathway in mosquitoes is the enzyme 3-hydroxykynurenine transaminase (HKT), which catalyzes the conversion of 3-hydroxykynurenine (3-HK) into xanthurenic acid (XA). In this work, we report eleven newly synthesized oxadiazole derivatives and demonstrate that these compounds are potent noncompetitive inhibitors of HKT from Ae. aegypti. The present data provide direct evidence that HKT can be explored as a molecular target for the discovery of novel larvicides against Ae. aegypti. More importantly, it ensures that structural information derived from the HKT 3D-structure can be used to guide the development of more potent inhibitors.

Keywords: Expression in Escherichia coli; Kinetic constants; New HKT recombinant; Xanthurenic acid detection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aedes / enzymology*
  • Animals
  • Dose-Response Relationship, Drug
  • Drug Discovery*
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Models, Molecular
  • Molecular Structure
  • Oxadiazoles / chemical synthesis
  • Oxadiazoles / chemistry
  • Oxadiazoles / pharmacology*
  • Structure-Activity Relationship
  • Transaminases / antagonists & inhibitors*
  • Transaminases / metabolism

Substances

  • Enzyme Inhibitors
  • Oxadiazoles
  • Transaminases
  • kynurenine-oxoglutarate transaminase