02042nas a2200181   4500008004100000020001400041245015200055210006900207260000900276300001200285490000700297520131400304653002301618100002401641700002901665700003101694856013501725       2007                        eng d  a0022-474X00aPartial characterization of glutathione S-transferases in pyrethroid-resistant and -susceptible populations of the maize weevil, Sitophilus zeamais0 aPartial characterization of glutathione Stransferases in pyrethr  c2007  a167-1700 v433 aGlutathione S-transferases (GSTs) from a susceptible (Sete Lagoas) and two pyrethroid-resistant populations (Jacarezinho and Juiz de Fora) of the maize weevil Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae) were characterized through in vitro colorimetric assays. GSTs showed higher activity peaks at pH 9.0 and 30[degree]C. The Km-values for GSTs were similar among the populations except for the resistant population from Juiz de Fora, which was about two-fold higher than the susceptible population from Sete Lagoas when using 1-chloro-2,4-dinitrobenzene (CDNB) as substrate (and a fixed concentration of reduced glutathione-GSH). The Vmax of this same resistant population was also over two-fold higher than that of the pyrethroid-susceptible population when CDNB and GSH were used as substrates. The resistant population from Jacarezinho also had a slightly, but significantly, higher Vmax than the susceptible population when using these two substrates. However, there were no significant differences among the kinetic parameters of GSTs from the maize weevil populations when DCNB and GSH were used as substrates. These results provide evidence of the involvement of enhanced GST activity as an additional pyrethroid-resistant mechanism in at least some maize weevil populations from Brazil.10aSitophilus zeamais1 aFragoso, Daniel, B.1 aGuedes, Raul, Narciso C.1 aOliveira, Maria, Goreti A.  uhttps://weevil.myspecies.info/partial-characterization-glutathione-s-transferases-pyrethroid-resistant-and-susceptible-populations