Revision as of 15:19, 11 October 2023

IsPETaseS93_I94insE/W159H-6xHis Tag

IsPETase is a hydrolase produced by Ideonella sakaiensis that degrades PET. Q119F/W159H is a double mutant of IsPETase.

Characterization

After protein purification, an enzymatic reaction is performed to measure enzyme activity. The substrate used is PET powder, which is decomposed into TPA and MHET under the action of the IsPETase double mutant. Determine the volume of purified enzyme solution required for 500 μL of the reaction system based on protein concentration. It reacted with PEF powder at 30 °C, 37 °C and 45 °C for 48h, and after the end the reaction solution was analyzed by high performance liquid chromatography, the liquid phase result of 6min corresponds to TPA, and the liquid phase result of 8min corresponds to MHET. Through the standard curve, the peak area of the product output by the liquid phase instrument is converted into the product concentration, such as Fig.1.

Fig.1 The concentration of TPA and MHET products of 500nM WT and S93_I94insE/W159H that react with PET powder for 48h at different temperatures. (A) is the product concentration obtained by the reaction temperature of 30 °C; (B) is the product concentration obtained by the reaction temperature of 37 °C; (C) is the product concentration obtained by the reaction temperature of 45 °C.

Conclusion

The IsPETaseS93_I94insE/W159H double mutant has a poor degradation effect compared with WT at 30°C, 37°C and 45°C. We analyzed that these two sites may not work synergistically to increase the activity of IsPETase.

Sequence and Features