Abstract
In this report, activity and stability of horseradish peroxidase (HRP) entrapped in polyacrylamide gel in the presence of proline (HEP) are compared with that of enzyme entrapped in absence of proline (HE). Within polyacrylamide (8%) beads, 80% entrapment yield for peroxidase was observed in the presence as well as absence of proline. The HEP (1.5 M proline) showed 170% higher activity compared to HE. HEP also showed significant increase in KM, Vmax and Kcat. At 8th cycle of use, HEP retained 40% of its activity, whereas HE retained only 10% of activity. In addition, in comparison with HE, HEP showed increased storage stability and thermo-stability. HEP showed higher activity compared to HE over an extensive range of pH (4–8), temperature (30–80 °C) and inhibitors such as NaN3, Cd2+ and Pb2+. Our results suggest that peroxidase entrapment in polyacrylamide gel in the presence of proline can be a useful approach for increasing activity and stability of horseradish peroxidase.
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Abbreviations
- HE:
-
Horseradish peroxidase enzyme entrapped in the absence of proline
- HRP:
-
Horseradish peroxidase enzyme
- HEP:
-
Horseradish peroxidase enzyme entrapped in polyacrylamide gel in the presence of proline
- K cat :
-
Turnover number, a constant which depicts the rate of turnover of an enzyme–substrate complex into product
- K M :
-
Michaelis constant, a constant which depicts substrate concentration that allows the enzyme to attain half Vmax
- V max :
-
Maximum rate of reaction, reaction rate when the enzyme is saturated with substrate
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Acknowledgements
PS is thankful to UGC-Start-up Grant no. F.4-5(107-FRP)/2014(BSR) and DST-SERB Project no. ECR/2016/000888 for financial support. DBT Builder project no. BT/PR-9028/INF/22/193/2013 is greatly acknowledged. RS is thankful for CUJ University Fellowship during the period of this work.
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Singh, R., Jha, A.B., Misra, A.N. et al. Entrapment of enzyme in the presence of proline: effective approach to enhance activity and stability of horseradish peroxidase. 3 Biotech 10, 155 (2020). https://doi.org/10.1007/s13205-020-2140-7
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DOI: https://doi.org/10.1007/s13205-020-2140-7