Abstract
Two proteins with fibrinolytic activity were partially purified from yellow mealworm (Tenebrio molitor) by ammonium sulfate precipitation between 30 and 70% saturation, gel filtration on Sephacryl-S200-HR, ion exchange chromatography on DEAE-Sepharose-FF and metal chelate on Cu–HiTrap–IMAC–FF, but the enzymes had not been completely separated from each other. The two partially purified fibrinolytic enzymes were designated as TMFE-I and TMFE-II (Tenebrio molitor fibrinolytic enzyme) with molecular weights of 27.5 and 24.9 kDa by SDS-PAGE individually. The partially purified solution of TMFE-I and TMFE-II was considerably stable in the range of pH 5–10 and characterized by pH optimum of the enzymatic activity at 8.0. Thermal stability of TMFE was excellent at 45°C and below. The K M value was 0.26 mM for amidolysis of Bz–Arg–pNA. According to inhibitor analysis by fibrin plate method, phenylmethylsulfonyl fluoride and tosyl-lysine chloromethyl ketone inactivated TMFE almost completely, but trans-(epoxysuccinyl)-l-leucylamino-4-guanidinobutane (E-64) and EDTA had little effect on their fibrinolytic activity. According to metal ion analysis by fibrin plate method, the effect of metal ions on activity of TMFE showed a great difference. Na+, K+ and Zn2+ had little effect on the activity of TMFE. Mg2+ and Cu2+ showed inhibition effect on the fibrinolytic activity of TMFE, but Ca2+ increased the fibrinolytic activity of TMFE at final concentration varying from 0 to 30 mM.
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This work was supported by the Nature Science Foundation of China (No. 30772739) and the “211” Project of Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology (No. 20091015).
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Huang, M.X., Ye, Y., Chen, Y.X. et al. Partial Purification and Characterization of Fibrinolytic Enzymes from Yellow Mealworm. Int J Pept Res Ther 18, 153–161 (2012). https://doi.org/10.1007/s10989-012-9288-x
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DOI: https://doi.org/10.1007/s10989-012-9288-x