Abstract
In this work, we studied a recombinant mu-class glutathione transferase of 25.5 kDa from Taenia solium metacestode (rTs25GST1-1) that follows Michaelis–Menten kinetics with 1-chloro-2,4-dinitrobenzene (CDNB). The kinetic parameters obtained for rTs25GST1-1 with CDNB and GSH were V max = 12.04 μmol/min/mg and Km = 1.38 mM, and V max = 10.20 μmol/min/mg and Km = 0.90, respectively. The optimal activity was found at pH 8 in the 37–40 °C temperature range. Circular dichroism studies for rTs25GST1-1 at different pH showed that it maintains a typical α-helix structure between pH 6.5–7.5, but loses it between pH 8 and 8.5. Thermal CD assays showed rTs25GST1-1 barely changed its secondary structure. Unfolding/refolding assays showed that rTs25GST1-1 retained its structure up to 40 °C without loss of its activity. Additionally, exposure of rTs25GST1-1 to cumene hydroperoxide did not produce significant changes in its structure and only affected 50 % of its activity.
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Acknowledgments
This work was supported by Consejo Nacional de Ciencia y Tecnología (CONACyT-176925) and Dirección General de Asuntos del Personal Académico (DGAPA-PAPIIT IN 219711). Aramis Roldan was supported by CONACyT (231036) and is a student of Posgrado en Ciencias Biológicas (PCBIOL) of Universidad Nacional Autónoma de Mexico (UNAM). Authors declare that the experiments to produce antibodies in rabbits comply with the current laws for animal use and care (NOM-062-ZOO-1999) of Mexico.
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Roldan, A., Torres-Rivera, A. & Landa, A. Structural and biochemical studies of a recombinant 25.5 kDa glutathione transferase of Taenia solium metacestode (rTs25GST1-1). Parasitol Res 112, 3865–3872 (2013). https://doi.org/10.1007/s00436-013-3577-y
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DOI: https://doi.org/10.1007/s00436-013-3577-y