Abstract
Human acidic fibroblast growth factor (haFGF) is a multifunctional protein involved in regulating a wide range of cellular processes. As a potent therapeutic agent, it is highly desirable to produce recombinant haFGF (r-haFGF) at low cost. However, the complex structure and formation of aggregation confines its high-level soluble expression and functional form. Herein, to produce r-haFGF efficiently in E. coli, we devised a novel soluble expression and cost-effective purification approach based on fusion with Scl2-M (a novel modified collagen-like protein) for the first time. By using this strategy, more than 95% of the Scl2-M-haFGF fusion protein was highly expressed in soluble form and the expression level of targeted fusion protein in shake flasks and 5-L fermenter was 0.42 g/L and 2.28 g/L, respectively. Subsequently, the recombinant Scl2-M-haFGF was readily purified through a facile process of acid precipitation and subjected to enterokinase (EK) cleavage. After Scl2-M cleavage, tag-free r-haFGF was further purified using ion-exchange chromatography. The recovery rate of the whole purification process attained 34.2%. Furthermore, the resulting high-purity (96.0%) r-haFGF was prepared by freeze-drying as a final product, and its bioactivity was confirmed to potentiate the proliferation of L929 and BALB-3T3 fibroblasts. Overall, our developed method has the potential for the massive production of the r-haFGF in the future.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 21576232, 21606205 & 21808199), the National Key Research and Development Program of China (No. 2018YFC1603900), and the Natural Science Foundation of Zhejiang Province (No. LY18B060002).
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Rahman, I.u., Liu, W., Wei, Z. et al. Efficient Soluble Expression and Purification of Recombinant Human Acidic Fibroblast Growth Factor from Escherichia coli via Fusion with a Novel Collagen-like Protein Scl2. Appl Biochem Biotechnol 191, 1562–1579 (2020). https://doi.org/10.1007/s12010-020-03269-y
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DOI: https://doi.org/10.1007/s12010-020-03269-y