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Tối ưu điều kiện biểu hiện AA9 polysaccharide monooxygenases tái tổ hợp trong hệ thống Escherichia coli

Bài viết trình bày tối ưu điều kiện biểu hiện AA9 polysaccharide monooxygenase tái tổ hợp trong hệ thống Escherichia coli với nội dung chính bao gồm khảo sát môi trường nuôi cấy tối ưu cho quá trình biểu hiện AN3860, nồng độ IPTG cảm ứng cho quá trình biểu hiện AN3860. Khảo sát nhiệt độ cảm ứng tối ưu cho quá trình biểu hiện AN3860 | 36 Tạp chí Khoa học amp Công nghệ Số 18 Optimization of culture conditions to express AA9 Polysaccharide monooxygenases AN3860 in Escherichia coli Ngo Thi Cam Nhung1 Le Quynh Loan2 Vu Van Van1 1 NTT Hi-Tech Institute Nguyen Tat Thanh University 2 Institute of Tropical Biology Vietnam Academy of Science and Technology ntcnhung@ntt.edu.vn Abstract Lignocellulose biomass is a copious source for second generation biomaterial Received 22 09 2022 production. The participant of Polysaccharide monooxygenases enzyme PMO in the Accepted 27 10 2022 reactions which convert lignocellulose biomass into monosaccharides enhances the Published 02 11 2022 activity and improve the efficiency of hydrolysis of hydrolase enzymes on lignocellulose substrate. Enzyme AN3860 obtained from Aspergillus nidulans strain belonging to AA9 PMO is expected to catalyze flexibly at C1 and C4 carbon positions of β-glycosidic linkage. As an enzyme with high potential of improving cellulose crystals hydrolysis capacity AN3860 was successfully cloned into the expression system of E. coli BL21 DE3 strain. In this study the culture process of recombinant strain with AN3680 gene is optimized to increase the target proteins yield thus ensure the outcome of purification process and save production cost. The results demonstrate that the E. coli recombinant strains grow sufficiently in TB Terrific Broth culture media and the highest yield of AN3680 protein achieved when the concentration of Isopropyl β-D-1- thiogalactopyranoside IPTG is 0.05 mM and the temperature of the reaction is 30 0C at Keywords 150 rpm. After 6 hours of induction the biomass reaches 500 mg L and the yield of AA9 AN3860 E. coli AN3860 account for 7-10 total protein generated. The recombinant AN3860 protein optimization is later harvested on larger scale and purified by Ni-NTA column chromatography polysaccharide method for analysis of bioactivities on lignocellulose substrates in the future. monooxygenases 2022 Journal of Science and .