The enzyme 3-hydroxykynurenine transaminase as potential target for 1,2,4-oxadiazoles with larvicide activity against the dengue vector Aedes aegypti
                                
                                    
                                        作者:Vanessa S. Oliveira、Cecília Pimenteira、Diana C.B. da Silva-Alves、Laylla L.L. Leal、Ricardo A.W. Neves-Filho、Daniela M.A.F. Navarro、Geanne K.N. Santos、Kamilla A. Dutra、Janaína V. dos Anjos、Thereza A. Soares                                    
                                    
                                        DOI:10.1016/j.bmc.2013.09.020
                                    
                                    
                                        日期:2013.11
                                    
                                    The mosquito Aedes aegypti is the vector agent responsible for the transmission of yellow fever and dengue fever viruses to over 80 million people in tropical and subtropical regions of the world. Exhaustive efforts have lead to a vaccine candidate with only 30% effectiveness against the dengue virus and failure to protect patients against the serotype 2. Hence, vector control remains the most viable route to dengue fever control programs. We have synthesized a class of 1,2,4-oxadiazole derivatives whose most biologically active compounds exhibit potent activity against Aedes aegypti larvae (ca. of 15 ppm) and low toxicity in mammals. Exposure to these larvicides results in larvae pigmentation in a manner correlated with the LC50 measurements. Structural comparisons of the 1,2,4-oxadiazole nucleus against known inhibitors of insect enzymes allowed the identification of 3-hydroxykynurenine transaminase as a potential target for these synthetic larvicides. Molecular docking calculations indicate that 1,2,4-oxadiazole compounds can bind to 3-hydroxykynurenine transaminase with similar conformation and binding energies as its crystallographic inhibitor 4-(2-aminophenyl)-4-oxobutanoic acid. (C) 2013 Elsevier Ltd. All rights reserved.