Thioredoxin reductase from the bovine filarial parasite Setaria cervi: Studies on its localization and optimization of the extraction.

Exploration of novel drug targets has been the major thrust area in filarial research. In this regard, identification and characterization of oxidative enzymes that play pivotal role in the survival of filarial parasite inside host are of immense importance. In this study, we are reporting the presence of an important redox regulatory enzyme, thioredoxin reductase (TrxR) in the bovine filarial parasite Setaria cervi. TrxR was found to be exists throughout the developmental stages viz. oocyte, microfilaria and adult of the parasite. Since further studies on this enzyme require adequate quantity, influential extraction parameters were optimized statistically using response surface methodology (RSM) employing a seven factors based Box-Behnken design matrix. ANOVA analysis revealed the relative importance of each parameter and a regression equation was eventually developed that could predict the specific activity (SA) of TrxR. Finally the optimized extraction conditions predicted by RSM was 6.1ml of 61.86mM buffer, pH 6.0, with extraction temperature 39.96°C for 180min in addition to 450rpm agitation and 20μl/ml of protease inhibitor. Therefore this study is going to be the maiden report depicting the identity of TrxR in filarial parasite and the optimized extraction conditions for its isolation with better kinetic efficiency.