Abstract
Site-directed mutagenesis was made to obtain a glucose isomerase (GI) working at high temperatures and low pH values and having high affinity to the substrate and more pH and termal stability in comparison with the native enzyme. For this purpose, GI gene from Geobacillus caldoxylosilyticus TK4 was cloned to pET-28a(+) vector and H99Q, V184T and D102N mutations were performed. Biochemical features of the recombinant and mutant enzymes were identified. These mutations enabled the mutant enzymes to increase the optimum temperature and KM and decrease the optimum pH and Vmax values of the reaction. Furthermore, the mutant proteins had more thermal and pH stability than that of the recombinant GI. The mutant enzymes showed the highest activities in the presence of Co2+, Cu2+ and Mn2+ and were more resistant to some metals than the recombinant GI. In conclusion, the site-directed mutations led to improve the performance of the recombinant enzyme, which means that the mutant enzyme (TK4GI mutation) may be practicable in high fructose corn syrup production process.
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This work was supported by the Scientific and Research Council of Turkey (TUBITAK) [no. 109T985].
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Dokuzparmak, C., Colak, A., Kolcuoglu, Y. et al. Development of Some Properties of a Thermophilic Recombinant Glucose Isomerase by Mutation. Appl Biochem Microbiol 56, 164–172 (2020). https://doi.org/10.1134/S0003683820020052
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DOI: https://doi.org/10.1134/S0003683820020052