Abstract
With proper design, immobilization can be useful tool to improve the stability of enzymes, and in certain cases even their activity, selectivity, productivity and economic viability. An immobilized β-glucosidase (BGL, EC 3.2.1.21) through matrix adsorption and cross-linked enzyme aggregate (ad-CLEA) technology is presented in this work. After adsorption and precipitation, BGL was immobilized to poly(glycidyl methacrylate-co-ethylenedimethacrylate) (PGMA/EDMA) microparticles using glutaraldehyde as the cross-linker. Immobilized BGL exhibits lower apparent Km but much higher Vmax than that of the soluble enzyme, suggesting greater enzyme–substrate affinity and rapid velocity. Besides, ad-CLEA-BGL presents better thermostability retaining activity nearly 70% for 3 h and approximately 50% for 5 h at 70 °C, high operational reusability remaining more than 90% activity after nine uses and excellent storage stability holding about 95% activity after 45 days. Furthermore, the cellobiose is completely hydrolyzed within 1 h with ad-CLEA-BGL, which is significantly more efficient than soluble enzyme (about 4 h). Therefore, BGL was successfully immobilized on PGMA/EDMA microparticles with an ad-CLEA technology and the immobilization greatly enhances the biochemical characteristics. This work indicates promising application for ad-CLEA-BGL in utilizing agricultural remnants, bio-converting cellobiose to fermentable reducing sugar and ethanol production.
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Xu Deng and Tian He contributed equally to this work and should be considered co-first authors. This work was financially supported by National Natural Science Foundation of China (no. 21775100).
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Xu Deng declares that she has no conflict of interest. Tian He declares that he has no conflict of interest. Jun Li declares that she has no conflict of interest. Hui-Ling Duan declares that she has no conflict of interest. Zhi-Qi Zhang declares that he has no conflict of interest.
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Deng, X., He, T., Li, J. et al. Enhanced biochemical characteristics of β-glucosidase via adsorption and cross-linked enzyme aggregate for rapid cellobiose hydrolysis. Bioprocess Biosyst Eng 43, 2209–2217 (2020). https://doi.org/10.1007/s00449-020-02406-5
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DOI: https://doi.org/10.1007/s00449-020-02406-5