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Effect of acaricides on the activity of glutathione transferases from the parasitic mite Sarcoptes scabiei

Published online by Cambridge University Press:  10 September 2007

E. U. MOLIN  and
J. G. MATTSSON
E. U. MOLIN
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
J. G. MATTSSON*
Affiliation:
Department of Parasitology (SWEPAR), National Veterinary Institute and Swedish University of Agricultural Sciences, SE-751 89 Uppsala, Sweden
*
*Corresponding author. Tel: +46 18 67 40 00. Fax: +46 18 67 43 04. E-mail: [email protected]
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Summary

Glutathione transferases (GSTs) are a family of multifunctional enzymes with fundamental roles in cellular detoxication. Here we report the molecular characterization of 3 recombinant GSTs belonging to the mu- and delta-class from the parasitic mite Sarcoptes scabiei. Kinetic constants were determined, and the effect of acaricides, including organothiophosphates, pyrethroid esters, a formamidine, a macrocyclic lactone, an organochlorine as well as a bridged diphenyl acaricide, on the activity of the GSTs were tested using 1-chloro-2,4-dinitrobenzene (CDNB) as model substrate. Our results showed that enzymes from the same class and with high amino acid sequence identity have significantly different kinetic properties. For instance, one mu-class GST lost more than 50% of its activity in the presence of one of the organothiophosphates while the activity of the second mu-class GST was only slightly reduced under identical conditions. Tertiary structure modulations indicated that structural differences were the crucial factor for the different kinetic patterns observed. Genome analysis showed that the two mu-class GSTs are organized in tandem in the S. scabiei genome. Taken together these results show that GSTs might be involved in the metabolism of acaricides in S. scabiei.

Keywords

Sarcoptes scabieiglutathione transferaseenzyme activityacaricidekinetic analysisgenome organization
Type
Research Article
Information
Parasitology , Volume 135 , Issue 1 , January 2008 , pp. 115 - 123
Copyright
Copyright © Cambridge University Press 2007

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